Section VI Technical Specification

SECTION VI – TECHNICAL SPECIFICATIONS
CONTENTS
Clause No. Description
SECTION VI - A TECHNICAL REQUIREMENTS -GENERAL
SECTION VI - B TECHNICAL SPECIFICATIONS (Electrical)
SECTION VI - C TECHNICAL SPECIFICATIONS (Civil)
SECTION VI - D INSTALLATION, TESTING AND COMISSIONING
SECTION VI - E DRAWINGS, TEST CERTIFICATES & O&M

MANUALS
SECTION VI - F CONTRACTOR’S SAFETY PROGRAM
SECTION VI - H LIST OF APPROVED MAKES
SECTION VI - I DRAWINGS
Section IV – Technical Specification

TABLE OF CLAUSES
Clause No. Description
SECTION VI - A TECHNICAL REQUIREMENTS – GENERAL
1.1 Project Description

1.2 Format of Specification
1.3 Scope of Work
1.4 Language
1.5 Units of Measurement
1.6 International Standards
1.7 Site Conditions
1.8 Electrical Characteristics
1.9 Spare Parts, Tools and Appliances
1.10 Electrical Power Supplies
1.11 Material and Finishes
1.12 Sub-station Structures-Nuts and Bolts
1.13 Castings
1.14 Welding
1.15 Works Inspections and Testing
1.16 Packing and Shipping
1.17 Cable Drums
1.18 Labels
1.19 Locks
1.20 Quality Assurance
1.21 Site Services
1.22 Contractor's Responsibility
1.23 Documentation

GENERAL TECHNICAL REQUIREMENTS
1.1 Project Description
Bhutan Power Corporation Limited (BPC) intends to upgrade the following

33/11 kV Substation:
a. Replacement of VCB panels for DPH-I & II Substations

i. Replacement of 11 kV panels at DPH – I
ii. Replacement of 33 kV panels with GIS at DPH - II
b. Up-grade 0.415/11 kV, 2x1.6 MVA to 2X2 MVA, Step-up Transformer

for DPH - I
1.1 This document and specification calls for the manufacture, testing at
manufacturer’s works, supply and delivery, storage, erection, testing and
commissioning of the works required for the Project.
1.2 Format of Specification
This specification describes equipment required in the project summarized in

Section 2 B and 2 C:
Brief Description Major works

Up-grade DPH – I & II, 33/11 kV substation as per
Substation the schematic drawing attached with the documents.
Cabling System 33 & 11 kV cables up-to the takeoff structure shall
form a part of the work.
Any appended drawings of the required equipment /works form part of this
specification.
1.3 Scope of Work
The Contract includes the manufacture, testing at manufacturer's works,

delivery, storage at site, insurance, erection, testing and commissioning of the
Equipment as specified including all civil works. The Contractor shall be
responsible for proper completion of the work till it is formally taken over by
the Employer.
The quantities given are estimated quantities. It should be clearly understood

that the contract will be on “item rate turnkey basis”.
Detailed scope of the works is as per the BOQ and specifications of the
bidding documents.
1.4 Language
The English language shall be used in all Contract documentation and in all
correspondence between the Contractor and the Employer.

1.5 Units of Measurement
Metric units of measurement (System International) shall be used in all

Contract documentation. Angular measurement shall in degrees with 90
degrees comprise one right angle.
1.6 International Standards
All Equipment and the Works under this Specification shall conform to the
latest editions of the International Electrotechnical Commission (IEC) or
Bureau of Indian Standards (BIS) Specifications.
1.7 Site Conditions
1.7.1 Elevation
The elevation above sea level is 2400 m at Thimphu.
1.7.2 Special Conditions
Particular problems, which shall receive special consideration, relate to

operation of the equipment in wide ranging temperatures and the presence of
moisture, insects and vermin.
1.7.3 Access
DPH-I & II (Changzamtog) is accessible from Phuentsholing, Bhutan by road.

The site is nearly 54 km from the Paro international airport. Bidders are
informed to visit and work in the project locations, special permits from the
Ministry of Home Affairs are required which is required to be processed from
Thimphu and Regional Immigration Offices located at Phuentsholing,
Gelephu and Samdrupjongkhar. For processing the permits, BPC will provide
only assistance and permits need to be processed by contractor themselves.
Such cost shall be borne by the contractor and included in the project cost.
1.8 Electrical Characteristics
1.8.1 Design Features for 33 kV, 11 kV and 415 V Equipment
Nominal system Voltage 33kV 11 kV 11 kV 415 V
Location Indoor Outdoor Indoor Indoor

Highest system Voltage kV 36 12 12 415/ 240 1
System neutral earthing Solidly Solidly earthed Solidly Solidly

earthed earthed earthed
Minimum Clearances in air

a) Between phases - mm
351 280 130 -
b) Phase to earth - mm
c) Section clearance -mm 222 140 80 -
d) Ground clearance -mm
2800 2600 2600 -
3700 3700 3700 -
Ph-Ph spacing for Bus-mm - 1200 - -
Insulation levels
a) 1 minute power
70 28 28 2
frequency kVrms
b) 1.2/50 microsecond
impulse kVp 170 75 75 6
Creepage distance mm N/A 25 mm / kV N/A
No. of phases 3 3 3 3
Frequency Hz 50 50 50 50
Equipment suitable for 1500 350 350 55kA

short circuit withstand
(for 3 (for 3 sec.) (for 3 (for 3 sec.)
MVA
sec) sec.)
1
415/240 V no load. 400/230 V on load
The above are the values for 1000 m altitude and shall be corrected based
on the elevation of the site for which the equipment shall be designed.
1.8.2 Creepage Distance
The creepage distance shall not be less than 25 mm/kV.
1.9 Spare Parts, Tools and Appliances
The bidder shall attach the spares, special tools and/ or appliances which are
recommended apart from Schedule “D”.
The Employer may order all, none or any of the recommended items. Those
ordered shall be delivered not later than the date of receipt of the last shipment
of the associated item of plant. The price of the items shall be subject to the
same price conditions as the associated item of plant.
All spares shall be interchangeable with the original parts. They shall be
treated and packed for long term storage under the climatic conditions of site.
Each item shall be clearly and permanently labeled on the outside of its
container with its description and purpose. When several items are packed in
one case, a general description of the contents shall be given on the outside of
the case. Spare parts shall not be shipped in the same cases as components,
which are used for erection. The cases shall be clearly labeled to indicate that
they contain spare parts or tools and each tool or appliance shall be clearly
marked with its size and purpose.
All case containers or other packages are liable to be opened for inspection
and checking on site.
The cost of recommended spares, special tools (other than those specified in
the BOQ) will not be taken into consideration when comparing bids.
1.10 Electrical Power Supplies
a) Power Supplies
Power supplies for plant and equipment shall be:
i. 415 V, 3 phase, 4-wire, 50 Hz for power.

ii. 230 V, 1 phase, 50 Hz for lighting, indication, and anti-
condensation heaters.
iii. 110 V DC for relays, essential indication, CB spring charging,
controls/ protection, alarms, CB tripping and closing.
b) Miniature Circuit Breakers
Means shall be provided for protection and isolation of circuits

associated with protection, control and instruments. They shall be of
approved type and grouped, as far as possible, according to their
functions. They shall be clearly labeled both on the panels and the
associated wiring diagrams.
Miniature circuit breakers shall be of the thermal and magnetic tripping

type, and comply with IEC 60898 and IEC 60947-2.
c) Instruments
All electrical instruments and meters shall comply with IEC 60051 and
IEC 61010 and, unless otherwise specified, shall be of industrial grade
accuracy. Three-phase power measuring instruments shall be of the
three-phase unbalanced load pattern wherever the current and Voltage
references permit. Energy meters shall be three phase four wire having
maximum demand indicator, RS485 port and optical port.
All indicating and recording instruments shall be digital type, flush

mounted in dust proof cases complying with IEC 60068 and
dimensions to IEC 61554.
The size of all indicating instruments shall be 96 mm square with long

scale and instruments supplied from transducers shall have 4-20 mA
movements.
Instrument dials for analogue meter if any shall be white with black
markings. A red line shall be drawn on each scale to represent rated
conditions. Bezels shall have uniform semi-gloss black high-grade
finish.
The movements of all electrically actuated instruments shall be of the
deadbeat type. Instruments shall be provided with a readily accessible
zero adjustment wherever possible.
d) Terminals
Moulding materials shall be self-extinguishing or resistant to flame

propagation, substantially non-hygroscopic and shall not carbonise
when tested for tracking. The insulation between any terminal &
framework or between adjacent terminals shall withstand a test of 2 kV
rms. for one minute. The mouldings shall be mechanically robust to
withstand handling while making terminations.
All terminals shall be mounted in accessible positions. Adjacent

terminals shall be adequately spaced with respect to each other and to
the incoming cable gland plate. Separate terminations shall be provided
on each terminal strip for the cores of incoming and outgoing cables
including all spare cores.
Terminal blocks for CT and VT secondary leads shall be provided with

test links and isolating facilities. Terminals provided for current
transformers shall incorporate facilities to enable secondary windings
to be short-circuited without disturbing fixed wiring and earthing
facilities.
Terminations for circuits operating at Voltages greater than 60 V shall

be protected by transparent insulating covers marked with the working
Voltages.
DC circuit terminals shall be segregated from AC terminals.
Unless otherwise specified, all the terminal blocks except the terminal
blocks for CTs shall be suitable for connecting minimum two 2.5
sq.mm copper conductors of the external cables at each connecting
point. The terminal blocks for CTs and PTs shall be suitable for
connecting minimum of 4.0 sq. mm and 2.5 sq. mm copper conductors
respectively.
All spare contacts and terminals of the panel mounted equipment and
devices shall be wired to terminal blocks.
The terminal assemblies shall give the required number of ways plus
20% spare with a minimum of 5 terminals. These shall be uniformly
distributed on all rows of terminal blocks.
e) Panel Wiring
All wiring shall be carried out with 1100 V grade, single core, stranded
copper conductor wires with FRLS PVC insulation and shall be
Vermin, rodent proof. The minimum size of the stranded copper
conductor used for panel wiring shall be as follows:
a) All circuits except CT circuits : 2.5 mm2 per lead.
b) CT Circuit : 4 mm2 per lead.
The minimum number of strands per conductor shall be seven. Extra
flexible wires shall be used for wiring of devices mounted on moving
parts such as swinging panels and doors.
The wiring shall be bound and supported by clamping, roughing or

lacing. Spiral wrapping will not be accepted. Wireways shall not be
more than 50% full. Adequate slack wire shall be provided to allow for
one re-stripping and reconnection at the end of each wire. When
screened cables or wires are necessary, an insulating sheath shall be
included. Wiring and supports shall be of fire resistant material. Wiring
shall only be jointed or teed at terminals. Terminals of the clamp type
shall not have more than two wires connected.
f) Wire Colour Code
Wire colours shall be as follows:
Colour Purpose
Red R-phase connections in current and Voltage
transformer circuit only
Yellow Y-phase connections in current and Voltage
transformer circuits only
Blue B-phase connections in current and Voltage
transformer circuits only.
Green with Connections to earth
Yellow Stripes
AC neutral connections, earthed or unearthed,
Black connected to the secondary circuits of current
and Voltage transformers.
Any other AC connections other than those above.
Colours
Alternatively, where equipment is wired in accordance with a

manufacturer's standard diagram, wiring may be carried out in a single
colour except that all connections to earth shall be green with yellow
stripes.
g) Terminations and Ferrules
The ends of every wire and every cable tail shall be fitted with
numbered ferrules of white with alpha numbers clearly engraved in
black. The ferruling should be as per BEBS-S12 (1964).
Moisture and oil resisting insulating material shall be used. The

ferrules shall be of the interlocking type and shall grip the insulation
firmly.
Wires and terminals associated with tripping circuits shall be

distinctively marked.

h) Electrical Insulation
Insulating materials shall be finished to prevent deterioration of their

qualities under the specified working conditions.
Plastics, elastomers, resin-bonded laminates and inorganic materials

shall be of suitable quality selected from the grades or types in the
appropriate IEC Standard.
All cut or machined surfaces and edges of resin-bonded laminates shall

be cleaned and then sealed with an approved Varnish as soon as
possible after cutting.
i) Electronic and Control Equipment
Equipment shall be capable of withstanding randomly phased transient

over-voltages of either polarity on the power supply or interruptions of
the power supply without damage or impairment to the equipment's
subsequent performance. In the case of controls, no mal-operation shall
occur.
Where manufacturers require that electronic equipment supplied under

this Contract should not be subjected to insulation resistance tests
("Meggering"), suitable warning notices shall be provided and installed
in appropriate locations.
No thermionic valves shall be used in the equipment. Wherever

possible, integrated circuits shall be used.
It shall be possible to remove/replace card from/to electronic

equipment without damage and without interfering with the operation
of the rest of the equipment or system. If necessary, consideration
should be given to switching off the supplies locally to a card to
prevent inadvertent interference to the equipment or system during
removing/replacing a card.
j) Alternating Current Supply Practice
Double-pole switches shall be used to break single-phase ac mains

supplies. For multi-phase supplies, each phase shall be switched
simultaneously and the neutral should preferably not be switched. If it
is switched, it shall be opened after and closed before the phase-lines.
All mains circuits shall be protected only in the phase-lines by MCBs

of suitable rating or by other suitably approved protective devices. The
neutral shall be connected by a removable link located near the
protective devices.
All main transformers shall have an electrostatic screen, which shall be

earthed.

k) Direct Current Supply Practice
Double pole switches shall be used to break dc supplies, one pole for
the positive line and one pole for the negative.
DC circuits shall be protected by MCBs of suitable rating installed in

both positive and negative lines.
Measures shall be taken to prevent arcing across switches or relay

contacts which are required to break inductive circuits (e.g. bypass
diodes or capacitors connected across coils).
Power supply bus bars in cubicles shall be shrouded.
The duplicate auxiliary power supply feeders shall be provided in

Control panels. Auto-changeover facility in DC DB shall be provided
so that in case of failure of one power source, other shall cut in
automatically. The protective relays shall not give a trip signal for
momentary loss of control Voltage or during changeover of control
Voltage.
l) Batteries
Electronic equipment shall not use local internal batteries unless the
approval of the Engineer has been obtained. Where approval is given,
batteries used inside equipment shall be of the totally sealed, leak-
proof type, lithium and rechargeable type.
m) Earthing
Provision shall be made for earthing all equipment intended for

connection in an ac mains supply.
All structural metal work and metal chassis shall be connected to earth.
Earthing conductors shall be at least equal in cross-sectional area to the
supply conductors and shall be capable of carrying the fault current for
1 second.
n) Anti-Condensation Heaters
Any items of electrical equipment which are liable to suffer from

internal condensation (due to atmospheric or load variations) shall be
fitted with heating devices suitable for electrical operation at 230 Volts
ac, 1 phase, 50 Hz of sufficient capacity to raise the internal ambient
temperature by 5°C. The electrical apparatus so protected shall be
designed so that the maximum permitted rise in temperature is not
exceeded if the heaters are energised while the apparatus is in
operation. Where fitted, a suitable terminal box and control switch
shall be provided and mounted in an accessible position. A thermostat
shall be provided in the heater control circuit to cut-off the heater at
45 C.

o) Interior lighting and Receptacles
Each panel shall be provided with a compact fluorescent lamp (CFL)

lighting fixture (11 W) rated for 240 V, 1 phase, 50 Hz supply for the
interior illumination of the panel during maintenance. Switching of the
fitting shall be controlled by the respective panel door switch. All CFL
lamps shall be with pin type holder.
Each panel shall be provided with a 230 V, 1 phase, 50 Hz, 6 Amps, 3

Pin receptacle with switch. The receptacle with switch shall be
mounted inside the panel at a convenient location.
p) Rubber Mats
Rubber mats, of appropriate thickness, shall be supplied and installed

in front of 33 kV and 11 kV switchgear, 415 V ACDB and 48 V
DCDBs.
1.11 Materials and Finishes
1.11.1 General
Unless otherwise provided for in the Contract, all materials, fixtures, fittings,
and supplies furnished (hereafter called "materials") shall be new and of
standard first grade quality. All assembly and construction work shall be done
in a neat and professional manner. Materials shall be free of defects. Materials
shall be brought to site only after inspection and issuance of proper dispatch
clearance. The dispatch clearance shall be issued within three working days
after the inspection from the BPC head office. The local materials like bricks,
sand aggregates shall be tested in the local laboratories before bulk supply.
The cube test for the concrete shall be to the contractor account and tested in
the local laboratory for the major concrete works.
All of the plant, whether temporary or permanent, shall be in accordance with

the Contract with respect to character, type, construction, constituent
substances, weight, strength, shape, dimensions, etc.
In choosing materials and their finishes, due regard shall be given to the harsh
climatic conditions which can occur in the area. Some relaxation of the
following provisions may be permitted where equipment is hermetically
sealed, but weatherproof materials should be used wherever possible.
All structural members, nuts and bolts shall be galvanised and shall conform
to the requirements indicated in clause 1.12 of this section.
1.11.2 Surface Coating and Galvanising
All ferrous metalwork shall be provided with an effective galvanized or

corrosion resistant paint treatment applied in accordance with the best trade
practice.
The paint shall be obtained from a reputed manufacturer. The formulation and
application procedure shall be as recommended by the manufacturer for the
appropriate exposure conditions.
All the equipment shall be painted with shade RAL 7032 (exterior) and
glossy white (interior). Poles shall be painted with silver paint.
Coatings shall not be applied before Vessels and chambers have passed
pressure or Vacuum tests. Precautions shall be taken to prevent corrosion
occurring in the period of time between cleaning of the steel and commencing
the painting.
Suitable amounts of each type and colour of finish coat as applied to the major
equipment items shall be provided for "touch-up" purposes.
The colour of all topcoats shall be approved by the Engineer.
1.12 Substation structure-Nuts and Bolts
All substation structural members shall be secured by means of nuts and bolts
with approved flat steel washers. Nuts and heads of all bolts shall be of the
hexagonal type and of uniform outline dimension.
Minimum size of bolts for all structural connections shall be 12-mm diameter
in mild steel. All bolts shall conform to IS 12427- 1988, property class 5.6.
All bolts washers and screwed rods shall be galvanized including the threaded
portions. All nuts shall be galvanized with the exception of the threads, which
shall be oiled. All bolts attaching insulator set droppers, U bolts and earth
conductor clamps to the towers shall be provided with extra thread length to
accommodate two nuts and a washer in an approved manner. The screwed
thread of any bolts or studs shall not form part of a shearing plane between
members.
All washers shall be included under this Contract, including locking devices
and anti-vibration arrangements, which are to be subject to the approval of the
Engineer. The washers shall be of adequate thickness to abridge the projection
of the shaft and the commencement of the threaded portion. Taper washers
shall be fitted where necessary.
Nuts shall be finger tight on the bolt and will be rejected if they are, in the
opinion of the Engineer, considered to have an excessively loose or tight fit.
Bolts re-threaded after galvanizing will be rejected.
The Contractor shall allow for the supply of surplus bolts, nuts and washers in
excess of the exact amount measured to allow for shortages due to loss,
misappropriation etc.
Bolts of a single diameter only shall be used for a given tower/structure type,
and as far possible for all tower/structure types. Only in exceptional cases
different diameter bolts shall be used with the prior approval of the Engineer.
But even in the latter case, for each tower/structure type, all the bolts used
shall be of the same diameter.
Usage of High Tensile bolts will generally be prohibited and only in

exceptional cases, it shall be allowed with prior approval of the Engineer and
under the directions of the Engineer.

1.13 Castings
All castings shall be free from blowholes, flaws and cracks as far as is
practicable. No welding, filling or plugging of defective parts shall be done
under any circumstances. All cast-iron shall be of close-grained quality
approved by the Engineer.
1.14 Welding
All joints shall be bolted joints and welded joints shall not be permitted either
during the design stage or the construction stage. However, during erection in
case of additional unforeseen requirements by the Employer, if welding needs
to be resorted to, the same shall be done with prior approval of the Engineer,
and shall conform to BIS specifications. In such a case, the Contractor shall
specifically indicate the location and purpose along with the proposed
methodology for welding for the Engineers' approval. The wielding shall be
carried out by a certified welder who have undergone minimum of certificate
level training in this trade.
1.15 Works Inspections and Testing
a) Works Tests
These are detailed in the technical specifications. The results of all

works tests shall be recorded and submitted to the Engineer no later
than the date of delivery of ex-works.
b) Proposed Scope of Inspection
The Engineer may at the Employer's discretion witness the works tests described in
the following Technical Specification and may also make Visits to monitor progress.
The Contractor shall give minimum of two weeks notice to the Employer/Engineer
with a copy to Engineer, in case they desire to witness the tests, indicating date and
place of Inspection.
The test equipment, meters, instruments etc. used for testing shall be calibrated at
recognised test laboratories at regular intervals and Valid certificates shall be made
available to the Employer's representatives at the time of testing. The calibrating
instruments used as standards shall be traceable to Indian/International standards.
c) Engineer's/Employer's Authority
Inspection and witnessing of tests shall be carried out in accordance with the
Conditions of Contract. The Engineer will be responsible for advising the Contractor
of acceptance or rejection. The Inspector has the authority to delay delivery of any
items of equipment, which have not been tested and proved in accordance with the
Contract.
1.16 Packing and Shipping
Any items liable to be damaged in transit shall be effectively protected and

securely fixed in their cases. All cases of over 2 tonnes shall be marked to
show where slings should be placed.

All cases shall be clearly identified giving particulars of manufacturer's name
and type of equipment. All identification marks on the outside of cases shall
be waterproof and permanent. All electrical equipment shall be adequately
sealed and desiccating agents used where necessary to prevent damage from
condensation. All equipment shall be packed and protected, bearing in mind
that it will be shipped to a harsh environment, that a considerable period may
elapse between its arrival on site and it’s unpacking and that covered storage
may not always be possible.
All wood and other materials used in packing cases shall be insect free.
Adequate protection and precautions are to be taken to exclude termites and
other vermin, noxious insects, larvae or fungus from the packing materials or
plant. All contents are to be clearly marked for easy identification against the
packing list.
The Contractor shall protect all steelwork before shipment, to prevent

corrosion and/ or damage. Bundles of steel sections shall be properly tied
together by an approved method and care shall be taken to ensure that they are
robust and that they can be handled easily during shipment.
Bolts and nuts shall be double bagged and crated for shipment. Crating of
dissimilar metals is not acceptable.
Packing cases where used, shall be strongly constructed and in no case shall
timber less than 25 mm in thickness be used. The contents of packing cases
shall be securely bolted or fastened in position with struts or cross battens.
Cross battens supporting weight in any direction shall not rely for their support
on nails or screws driven lengthwise into the grain of the wood, but shall be
supported by cleats secured from inside.
1.17 Cable Drums
HT cables shall be delivered in the steel cable drums while LT and control
cable shall be delivered wound on strong wooden drums treated to an
approved International Standard by Vacuum impregnation with copper-
chrome-arsenate (CCA) preservative to resist rotting, termite and fungus
attacks. Contractor may take back the steel cable drums. However, incase
contractor has to handover the HT cables to BPC, the same shall be handed
over properly rolled in the steel drums. Drums with an outside diameter
exceeding 2.5 metres and an outside width exceeding 1.4 metres shall not be
used except with the Engineer's approval. The central hole of the drums shall
be reinforced with a steel plate of thickness not less than 10 mm to fit an axle
size 95-mm diameter. The interior of the conductor drums shall be lined with
bituminous paper to prevent the conductor from being in contact with timber.
Waterproof paper and felt lining shall overleap at seams by at least 20 mm and
the seams shall be sealed.
Drums shall be adequately protected by securely fastening substantial wooden

battens around the periphery. These battens shall be secured by means of steel
tap bindings.
The thread of bolts used to strengthen the cable drums shall be peened in such
a way that the nut can be tightened but cannot be readily removed.

1.18 Labels
All equipment shall be provided with labels or name plates, giving a

description of the equipment, together with information regarding the rating,
nominal Voltage, nominal current and the like under which the item of plant in
question has been designed to operate. The labels shall be permanently
attached in a conspicuous position. Where this is not practicable, such labeling
shall be provided on packaging to the Engineer's approval.
Labels shall be made of non-rusting metal or 3-ply lamicoid. Labels shall have
white letters on black or dark blue background. The lettering size shall be 6
mm for panel designation and minimum 3 mm for device labels. The label
inscriptions shall be subject to the Employer’s approval.
1.19 Locks
Provision shall be made for the locking of mechanism boxes, indoor and
outdoor equipment to limit access or for the safety of personnel. The locks
shall be rust proof and shall be provided as a part of the equipment.
1.20 Quality Assurance
The Bidder shall submit in the tender an outline of the quality assurance
practices that will be applied to all aspects of the manufacturing process.
Within one month of receipt of a letter of acceptance (LOA) under this for
equipment specification and civil works, the Contractor shall submit a detailed
Quality Assurance Manual, which conforms generally to the requirements of
ISO 9002. Approval to proceed with manufacture of equipment within this
Contract will not be given until this Quality Assurance Manual has been
received and approved by the Engineer. Delays to the Contract completion
date due to non-compliance with this specification requirement will be the
Contractor's responsibility.
Major features of the Quality Assurance Scheme practiced by the Contractor

and detailed in his Quality Assurance Manual shall be:
a) The Contractor has defined all staff responsibilities and the QA

systems operating within the organisation for the purpose of ensuring
adequate quality of the end product.
b) The Contractor has a senior officer with the authority to resolve

matters of quality to the satisfaction of the Engineer.
c) The Contractor has adequate facilities under the control of properly

trained staff to perform the quality control duties.
d) All production operations and test functions are properly documented

and available to any relevant member of the Contractor's workforce.
e) A detailed inspection and test plan is prepared for the whole

manufacturing operation.

f) Regular and systematic programs of testing are carried out for all
incoming raw materials.
g) Regular calibration checks are carried out on all measuring equipment

used in the manufacturing operations.
h) Statistical analyses are carried out regularly on appropriate test results

to confirm that all processes are performing within the specified
tolerances.
i) Adequate procedures are planned for corrective action in the event that
quality checks show that performance is not satisfactory.
j) All checking activities, test results etc. are recorded on appropriate

standardised forms and these are verified, certified, recorded and filed
in a systematic manner.
1.21 Site Services
1.21.1 Living Accommodation
The Contractor has to make his own arrangements with regard to

accommodation for his expatriate/local staff during the supervision of
erection. No construction for temporary accommodation will be allowed
within the substation area.
All dwellings and buildings existing or erected for any purpose by the
Contractor shall comply with local regulations in regard to construction, water
supply, sanitation and other requirements. The Contractor is responsible for
seeking approval from concerned authority whenever required to take up
infrastructure works like construction of site office, labour camps, site stores,
etc. Temporary construction camps are to be provided with proper sanitation
and other necessary facilities. All temporary accommodation shall be removed
by the Contractor when no longer required and before the granting of the Final
Certificate. After the removal of accommodation the ground shall be left in a
clean and tidy condition.
1.21.2 Office Accommodation
The Contractor is to bear all expenses in connection with their office

accommodation, accommodation of the staffs, temporary housing and things
needed for the purpose of the Contract. The Contractor is also to provide
temporary site office minimum 16 sq.m together with one table with lockable
drawer, three chairs (plastic) with toilet and water facilities for BPC site
supervisor engaged for construction, supervision of the Works and the cost of
these shall be deemed to be included in the Contract Price.
1.21.3 Medical Facilities
The Employer will not provide these and the Contractor shall make his own
arrangements where these services may be required for his staff.

1.21.4 Labour Work Permits, Accommodation and Insurance
It will be the responsibility of the Contractor to ensure that all grades of

expatriate labour have the current and correct work permits and or Visas, and
to comply in every way with the immigration and or emigration regulations.
The contractor shall also ensure that they comply with the labour laws of the
country and the requirements for leave, accommodation and insurance of all
his employees and the employees of his sub-contractors. The Contractor in all
dealings with labour in his employ shall have due regard to all recognised
festival days of rest and religious or other customs.
1.21.5 Transport to Site
The Contractor is to bear all expenses in connection with the transport to Site
of all plant, material and things needed for the purpose of the Contract
including warehouse rent, handling and other charges, which may occur. The
Contractor is to observe any regulations, which limit loads on roads and
bridges over which material may be conveyed.
1.21.6 Plant Handling and Storage
The handling and storage of any plant at the Site will be the responsibility of
the Contractor. The Contractor shall arrange for suitable lay-down areas. The
Contractor is to advise on the protection of all material against corrosion, theft,
and mechanical damage during storage and erection at the Site.
Only galvanised structural steelwork may be stored in the open. Plant sensitive
to climatic conditions must be stored in closed buildings protected from dust
and humidity.
1.21.7 Access
The Contractor will be responsible for the construction and maintenance of

any temporary roads. When haulage or construction roads are no longer
required the Contractor shall break up hardened surfaces, remove all imported
material, and shall reinstate the original surface and topsoil of the disturbed
areas to a natural condition.
1.21.8 Site Sanitation
The Contractor shall ensure that every construction site is maintained in a

clean and sanitary condition. The Contractor shall provide refuse collection
and disposal services including sweeping of paved streets and cleaning of
drainage channels. Adequate mobile or other toilets shall be provided at the
work sites controlled by the Contractor. The Contractor shall ensure that such
toilets remain in a hygienic condition.
1.21.9 Construction Power Supply
Contractor shall make his own arrangements for construction power supply
and pay the requisite charges/fees to the BPC.

1.21.10 Lighting and Power
All power and lighting circuits shall be constructed with due regard for
personnel safety and shall comply with recognised codes of practice and local
regulations. All circuits shall be fitted with earth leakage systems.
1.21.11 Spoil Areas
Disposal areas for equipment foundation spoil shall be determined by mutual

agreement with the Engineer, the Employer, land owners, and local
authorities. It shall be the responsibility of the Contractor to ensure that spoil
does not negatively impact the natural beauty, the function or ecosystems of
the area. It will be the responsibility of the contractor to properly dispose off
excavated soil at the designated place by the municipal corporations.
1.22 Contractor's Responsibility
1.22.1 Safety of Personnel
The Contractor shall afford maximum safety to personnel directly engaged on

this Contract or to persons who, in the normal course of their occupation, find
it necessary to utilise temporary works erected and to frequent the working
area. Additional safety regulations to be followed by the Contractor at site are
attached with the specifications.
Once any section of the plant has been made alive; the Contractor, the
Engineer and the Employer shall establish and agree to a system for ensuring
the safety of personnel and equipment. While the plant is under the control of
the Contractor, the Contractor shall be primarily responsible for the safety
precautions.
It will be mandatory under this contract to provide at least safety helmets and
gumboots to all the personnel working at the site.
1.22.2 Contractor's Employees
The Contractor shall provide adequate transportation, accommodation,

boarding and medical facilities for all personnel in his employ. He is also to
comply with the requirements of all relevant Labour Laws of Bhutan.
The Contractor shall be responsible for the behavior on site of all personnel
employed by him.
1.22.3 Training of Local Staff
The Contract shall include for the training of the Employer's employees in the
areas corresponding to installation and commissioning of 33 & 11 kV
breakers, Package substations, testing and commissioning of UG cables and
general O&M of the substation at the site for period of 4 days at the respective
site.

1.22.4 Progress Reports
At monthly intervals, the Contractor shall submit to the Engineer detailed

progress reports (in triplicate) in an approved form indicating the stage
reached in the design, ordering of material, manufacture, delivery and
supervision of erection of all components of plant. All variances from the
agreed schedule are to be promptly reported. These reports shall be forwarded
promptly so that, on receipt by the Engineer, the information contained therein
is not more than seven days out of date. One copy shall also be forwarded to
the Engineer's representative on Site. These reports shall be prepared using
project management software like Microsoft Project. The soft copies of the
report shall also be supplied to the Engineer/ Employer.
The Contractor shall submit to the Engineer a weekly return detailing for each
portion of the works separately, the numbers of the various classes of
workmen employed by him on the Site, the Contractor's equipment on site, or
any other information that may reasonably be required.
Access to the Contractor's and Sub-contractor's works shall be granted to the

Engineer and Employer at all reasonable times for the purpose of ascertaining
progress.
1.22.5 Progress Review Meetings (PRM)
The Contractor shall attend regular formal site progress review meetings with
the Engineer where progress and construction-related issues will be reviewed.
The Contractor shall prepare for issue the day before the meeting, detailed
schedules showing separately the erection, fixing, concreting, commissioning,
or other work activities planned for the next two weeks as well as progress
achieved over the preceding week.
The Contractor shall also be required to attend other meetings from time to
time as required for the project and the person representing the contractor shall
be fully empowered to take decisions at such meetings.
1.22.6 Relations with Local Residents and Authorities
The Contractor shall liaise with local authorities on matters concerning the
impact of his operations on the local communities. Any problems that cannot
be resolved by the Contractor shall be referred to the Employer through the
Engineer.
1.22.7 Public Relations
The Contractor shall not publish or provide any information relating to

progress or financial status of the works to any person or organisation without
the prior consent of the Employer.
1.22.8 Environmental Considerations
The Contractor shall ensure that construction does not negatively impact the
natural beauty, the function, the amenities, or the ecosystems of the area and
care shall be taken to prevent permanent damage.

All rivers and streams shall be protected from direct or indirect spills of
pollutants resulting from the Contractor's activities.
The Contractor shall provide drainage facilities at each substation site, and
shall revetate the surface where necessary to prevent erosion and consequent
weakening of the foundations.
The Contractor shall as far as possible, protect the flora within the work sites.
If areas are disturbed beyond the designated work boundaries, the Contractor
shall reinstate the ground and re-establish suitable Vegetation as directed by
the Engineer at no extra cost to the Employer. Such re-establishment shall take
place as soon as practicable after the Engineer's request.
The Contractor and his employees shall protect all faunas living within the site
area and shall ensure that hunting, shooting, bird nesting, egg collecting, or
trapping does not occur. Permits to cut any trees shall be obtained from the
relevant authorities through the Employer.
The Contractor shall as far as possible, restrict the dust pollution due to
digging activities. Special care shall be taken to reduce the pollution by
spraying water at regular intervals as per the directives of engineer or
supervisor so that the effects of dusts and inconvenience to the public are
minimized.
The contractor shall not dig and leave the place open for a maximum period of
7 days. The cable laying and foundation etc shall be so planned that as soon as
digging is done the work is carried out and covered up. As a safety measure,
the Contractor shall also barricade the working area with the warning tapes
and bamboos.
Contractor shall mobilize the workforce, equipment and start the work only
after getting environmental clearance from National Environment
Commission. BPC shall process for theses clearances and hand over to the
contractor at as early as possible after signing of the contract agreement.
The work site shall be kept neat and clean at all the times. Proper house
keeping of the site and store shall be done as directed by the engineer in
charge as per the directives at the site without any extra cost to the employer.
1.23 Documentation
1.23.1 General
In addition to the documentation requirements set out in the Conditions of

Particular Application, the Contractor shall provide the information requested
below.
Unless otherwise specified, 3 (three) copies of every item of submission shall
be submitted by the Contractor.
1.23.2 The following essential drawings and information shall be submitted for
approval after signing of the contract agreement before the work is put in
hand.

1. Drawings for 33 kV GIS panels - 15 days.
2. Drawings for 11 kV panels - 15 days.
3. Drawings for transformer – 15 days.
1.23.3 Following drawings shall be enclosed with the bid:

a) The program in the form of a network based on the principles of
PERT/CPM, detailed to cover entire scope of the project showing all
activities, their duration, start and finish dates and their inter-
relationships and major milestones.
1.23.4 As-Built Drawings on Completion of the Works

Prior to the issue of the Taking-Over Certificate, the Contractor shall submit
four copies (one reproducible and four copies) of complete sets of As-Built
drawings to the Engineer/ Employer for each item of plant as per section 2 E.
Soft copies of all as-built drawings in Auto Cad shall also be submitted. This
shall also be the condition for the issuance of the taking over certificate.
1.23.5 Test and Inspection Documents
The Contractor shall submit to the Engineer for approval a summary table of
tests and inspections to be carried out in the manufacturer’s works and at site
at least 2 months before the first scheduled activity.
The schedule shall include:
 Raw materials test and inspections;
 Workshop tests and inspections;
 Site tests and an inspection, including pre-commissioning and
commissioning tests.
The Contractor shall submit detailed procedures for the site tests for approval
at least one month in advance of the corresponding activities, including:
 Descriptions of the inspection and test methods;
 Test or inspection sheets with dimensions and blank spaces for
entering of measured values;
 Proposed dates and locations of tests and inspections.
The Contractor shall submit all final test and inspection reports to the Engineer
for approval, in the case of manufacturer’s works activities, before shipment
of the corresponding plant items.
1.23.6 Dispatch Documents
The Contractor shall supply consignment notes bearing the reference number
of each dispatch, and a list of the contents of each crate, identification
numbers, dimensions, net and gross weights and where necessary, any special
instructions regarding storage and the type of packaging/ handling.
1.24 Applicability of the requirement
The general specification and requirement shall be applicable to all the

equipment and work under the contract. The equipment manufactured shall be
in compliance with the general specification and detailed technical
specification.

1.25 Type Tests
All equipment/materials shall confirm to type tests including routine

acceptance and additional tests in accordance with the relevant Standards and
Codes. The Bidder shall submit copies of type test for each equipment during
detail engineering. The type tests report submitted shall be of the tests
conducted within the last five (5) years prior to the date of Bid opening. In
case the type tests reports are of the tests conducted earlier than five (5) years
prior to the date of Bid opening, the Contractor shall repeat these test(s) at his
cost.

SECTION VI - B
1.0 1.0 POWER TRANSFROMER
1.1.1 Applicable standards : IEC 60076, 60214, 60296

(Part I to IV) or IS 2026 (Part I to IV)
1.1.2 Parameters
Refer Table 1 for parameters of transformers.
1.1.3 Capitalisation of losses for bid evaluation
1.1.3.1 Transformer losses indicated by the Bidder will be capitalised considering

tolerances as applicable for the purpose of bid evaluation at the following
rates:
a) No load losses : Nu. 132,000/kW

b) Load Losses : Nu. 70,000/kW
c) Auxiliary losses : Nu. 53,000/kW
1.1.4 Penalty for Losses
1.1.4.1 If measured losses exceed the guaranteed figures; penalties will be levied on
the Contractor at the rates given in Clause 1.1.3.1 above, within tolerable
limits.
1.1.5 Accessories and Fittings
Each 2 MVA transformers shall have the following fittings and accessories,
including but not limited to:
a) Gas and oil actuated Buchholz relay with

i. necessary shut off valves
ii. test cock with pipe connections for sampling
iii. potential free contacts for initiation of alarm in case of slow gas
formation and trip in case of fast oil and gas surges
b) Off Circuit Tap Changer (OCTC)
c) Dial type thermometer with
i. maximum temperature indicator and its resetting device
ii. potential free contacts for initiating alarm on high temperature
and trip on very high temperature
iii. top oil temperature transducer and other necessary devices to
provide two sets of 4-20mA signals for transmitting to remote
control panel and SCADA.
d) Winding temperature indicator with
i. necessary sensing, compensating and calibrating devices
ii. potential free contacts for initiating alarm on high temperature
and trip on very high temperature
iii. WTI transmitter for remote indication

iv. winding temperature transducer and other necessary devices to
provide two sets of 4-20mA signals for transmitting to remote
control panel.
e) Pressure relief devices and relays for transformer tank.
f) Weather-proof marshalling box mounted on transformer tank
g) Name plate, rating and diagram plate and valve schedule plate
h) All Valves with locking arrangement (covers) and plugs as below:
i) Earthing pads of copper or non-corrodible material for transformer
tank (2 places) and radiator banks
j) Inspection manholes as required
k) Lifting arrangement for lifting
i. fully assembled transformer
ii. core and coil
iii. tank
l) Hauling eyes on each face of the transformer
m) Anti-earthquake clamping devices with locking arrangement
n) Ladder with anticlimbing device
o) Jacking pads
p) All the wires and cables shall be securely fastned in the body through
GI pipes and other places through flexible pipe.
1.1.6 The technical parameters of the transformers shall be as below.
Table 1: Technical Parameters of Transformer.
a) Designation of Power transformer

Transformer
Rating 0.415 kV/11 kV
2 MVA
b) Quantity As per BOQ
c) Installation Outdoor
d) No. of phases 3
And Frequency 50Hz
e) Type of cooling ONAN
f) No. load Ratio 0.415 kV/11 kV
g) Tap changer Off Circuit Tap Changer

i. Range 
ii. Step 1.25%
h) Tap changing operations Local/Remote
i) Impedance at principal 5.16 (Latest amendment of international
tap standard)
j) Vector group YNd11
k) System earthing Solidly earthed
l) Design ambient 40C
m) Temp.Rise
i. Winding
As per relevant standards
ii. Top Oil

n) Insulation Uniform Insulation
o) Terminations
Cable box type suitable for 11 kV, E
grade
i. HV (11 kV)
3 Cx 150 sq.mm Al cond. XLPE
armoured cable
Cable box type suitable for 0.415 kV,E
grade
ii. LV (0.415 kV) 1Cx150 sq.mm Cu cond. XLPE
armoured cable (multiple (4) runs each
phase)
p) Current Transformer As per requirements
i. HV & LV side As per site conditions
q) Paint shade RAL 7032
r) Maximum loss limit As per IEC/IS
s) Maximum Noise level at As per NEMA TR-1
1m
Note# for transformer protection; refer relays and protection for details.
1.1.7 Windings
1.1.7.1 The windings shall be of electrical grade copper.
1.1.7.2 Materials used in insulation and assembly shall be insoluble, non-catalytic and
chemically inactive in the hot transformer oil and shall not soften or otherwise
be affected under operating conditions.
1.1.7.3 Leads from winding to the terminal board and bushings shall be rigidly
supported to prevent injury from vibration.
1.1.7.4 HV windings shall be suitably braced to withstand short circuit stresses.
1.1.8 Core
1.1.8.1 The magnetic circuit shall be constructed from high grade, cold rolled, non-
ageing, grain oriented silicon steel laminations. Each sheet shall have an
insulating coating resistant to the action of hot oil.
1.1.8.2 The insulation structure for the core to bolts and core to clamp plates shall be
such as to withstand a voltage of 2000 V for one minute. The framework and
clamping arrangements of core and coil shall be securely earthed inside the
tank by a copper strap connected to the tank. The core clamping structure shall
be designed to minimise eddy current loss. The core shall be provided with
lugs suitable for lifting the complete core and coil assembly. The framework
and clamping arrangements shall be securely earthed.
1.1.9 Tank
1.1.9.1 The transformer tank shall be made from high-grade sheet steel, suitably
reinforced by stiffeners made of structural steel sections. All seams, flanges,
lifting lugs, braces, and other parts attached to the tank shall be welded. The

interior of the tank shall be cleaned by shot blasting and painted with two
coats of heat resistant, oil insoluble paint. Adequately sized manholes shall be
provided for ease of inspection and maintenance. Steel bolts and nuts exposed
to atmosphere, shall be galvanised.
1.1.9.2 Tank together with radiators, conservator, bushings and other fittings shall be
designed to withstand without permanent distortion the following conditions:
a) Full vacuum of 760 mm of Hg for filling with oil under vacuum.
b) Internal gas pressure of 0.35 kg/cm² with oil at operating level.
1.1.9.3 Tank shall be provided with a pressure release device, which shall operate at a
pressure below the test pressure for the tank and radiators. The device shall be
rainproof after blowing and shall be provided with a device visible from
ground to indicate operation. An equaliser pipe connecting the pressure relief
device to the conservator shall be supplied. The device shall be provided with
potential free contacts for alarm and tripping. Alternatively, a separate
pressure relay shall be provided for this purpose.
1.1.9.4 The tank cover shall be bolted type and not welded, sealed type. The tank
cover shall be removable and shall be suitably sloped so that it does not retain
rainwater.
1.1.10 Bushings
1.1.10.1 Bushings shall be of porcelain. Stresses due to expansion and contraction in

any part of the bushing shall not lead to deterioration.
1.1.10.2 The angle of inclination of oil filled bushing to vertical shall not exceed 30°.
1.1.10.3 Bushings rated 72.5 kV and above shall be of the oil-filled condenser type
with a central tube and draw-in conductor, which shall be connected to the
connector, housed in the helmet of the bushings. The pull through lead shall
be fitted with a gas bubble deflector.
1.1.10.4 Bushings shall be equipped with oil level indicators and means for sampling
and draining the oil. Condenser type bushings shall be equipped with the
following additional features:
a) Provision for power factor testing without disconnecting main leads;

and
b) Bushing turrets with vent pipes so connected as to route any gas

collection through the Buchholz relay
1.1.10.5 All applicable routine and type tests as stated and specified in the applicable
standards shall be carried out.

1.1.11 Radiators
1.1.11.1 Radiators shall be designed to withstand the vacuum pressure conditions

specified for the tank. They shall be so designed as to completely drain oil into
the soak pit and to prevent formation of gas pockets when the tank is being
filled.
1.1.11.2 Radiators shall be of detachable with bolted and gasket flange connections.
a) Shut-off valves and blanking plates on transformer tank at each point

of connection of inlet and outlet header
b) Top and bottom shut-off valves and blanking plate on each radiator
c) Lifting lugs
d) Top oil filling plug
e) Air release plug at top
f) Oil drain plug at bottom
g) Earthing terminals.
1.1.12 Tap changing gear
1.1.12.1 OFF CIRCUIT Tap Changer (OCTC) shall be provided. This handle shall be
suitable for operation by a man standing at ground level.
1.1.13 Marshalling box
1.1.13.1 The marshalling box shall be tank mounted /free standing, weather proof,
sheet steel (2.5 mm thick minimum), enclosed and with hinged door having
padlocking facility. Door and gland plate shall be fitted with neoprene
gaskets. Bottom shall be atleast 600 mm from grade level. Top surface shall
be sloped. The degree of protection shall be atleast IP55.
1.1.13.2 Contacts/terminals of electrical devices/relays, etc. mounted on the

transformer shall be wired to the marshalling box. Interconnecting wires
between the marshalling box and the accessories/devices shall be XLPE
insulated armoured cables together with provision of compression type, brass
cable glands at the marshalling box. The above mentioned cables as well as
terminating the cables shall be the Contractor's responsibility.
1.1.13.3 All contacts for alarm, trip and indication circuits shall each be electrically
free, designed for the auxiliary DC supply of 110 V (as available at the site)
and brought out to separate terminals in the marshalling box. Terminals shall
be rated for 10 A. Disconnecting/ shorting type terminal block shall be used
for CT circuits.
1.1.13.4 Transformer digital outputs for remote annunciation/control shall be provided

with two changeover contacts for alarm condition and two changeover
contacts for trip condition for each of the following conditions including but
not limited to: alarm and trip of Buchholz relay, oil and winding temperature
high and very high, pressure relief device, oil level low in tank and
conservator, auto changeover of control supply etc.

1.1.14 Cable Terminations
1.1.14.1 Primary and Secondary side cable boxes shall have sufficient space for
segregating the cable cores and for adequate clearance in air between bare
conductors at the terminals. Cable boxes shall be complete with necessary
glands, lugs and armour grips.
1.1.14.2 Air filled cable boxes shall be of adequate dimensions and designed in such a
manner that they can be opened for inspection without disturbing the gland
plate or incoming cable. Disconnecting chamber shall be provided for
disconnecting and moving away the main transformer, without removing the
cables or the cable box.
1.1.14.2 Provision shall be made for earthing the body of each cable box.
1.1.15 Tests
1.1.15.1 All auxiliaries and accessories such as bushing CTs, Temperature Indicators,
Buchholz and pressure relays shall be tested as per the applicable standards
and test certificates shall be furnished to the Engineer for approval.
1.1.15.2 Bends, pressure test for leakage, noise level and heatrun for 1 transformer of
each rating shall be carried out without any additional cost implication and
shall be included in the transformer cost.
1.1.15.3 Type test for each transformer rating carried out within 5 years shall be
submitted during the detail engineering.
1.1.16 Rejection
1.1.16.1 The Employer may reject the transformer if anyone of the following
conditions arises:
a) Any of the quantities/parameters of transformers subject to tolerances

are outside the tolerances given in the applicable standards or such
tolerance guaranteed in the Contractor's bid.
b) Winding and/or top oil temperature rise exceeds the
specified/guaranteed value; and
c) Transformer fails to withstand any of the dielectric tests.
d) If the transformer losses are beyond the maximum losses specified in
the specification of the bidder.
1.1.16.2 Employer reserves the right to have the transformer replaced or repaired by the
Contractor within reasonable period to Employer's satisfaction at no extra cost
to the Employer. The Contractor shall also bear the costs, including but not
limited to, incurred by the Employer in re-inspection/re-testing such as travel
and incidental expense, etc. The Contractor shall note that any delay in
completion time due to such repair/replacement shall be subject to liquidated
damages as specified in the Conditions of Contract.
1.1.17 Inclusions
1.1.17.1 The following items shall also be included in the Contractor's scope:

a) Supply, installation and commissioning of interconnecting cables
between transformers mounted accessories, marshalling box, in the
control room along with associated compression type brass cable
glands, lugs, etc.
b) Ten percent extra oil, in addition to that required for first filling of
complete transformer, in non-returnable drums,
c) A 10 liter can of paint for touching up the external surface after
erection, and
e) Terminal clamps/ connectors suitable for connecting to specified sizes
of conductor/ tube/ cable.
f) Tools and tackles as required for the normal operation shall be
supplied with the transformer.

2 – 33 KV GAS INSULATED SWITCHGEAR
2.1 SCOPE
2.1.1 The scope shall be for the design, engineering, manufacture, assembly, testing at
manufacturer's works before dispatch and services for supply, insurance,
transportation, delivery at project site, handling, storage and preservation at store/site,
transport to place of installation, complete work of site assembly, erection, testing at
site and commissioning of 36 kV SF6 Gas Insulated Switchgear (GIS). The
equipment shall comprise of:
a) Circuit Breakers
b) Bus Bars – Single bus
c) Current Transformers
d) Voltage Transformers
e) Transition between SF6 GIS and XLPE Cable terminations, operating
mechanism for each equipment
g) SF6 Gas
h) Supporting steel structures
i) Complete earthing system etc.
k) Any other item which is not covered above and but required for the operation
of the switchgear shall be supplied.
2.1.2 Any other equipment not explicitly mentioned herein/in the schedule of requirements
but is necessary for completeness of works specified shall also be included in the
scope without any extra cost. The equipment shall be suitable for climatic conditions
and altitude as mentioned in the technical specifications.
2.2 SYSTEM DETAILS
The following 33kV indoor GIS shall be provided at DPH-II 33/11kV substation:
(a) 1 no. of 33 kV incoming panel from/to Olakha substation which shall be

connected with 3Cx300 sq.mm XLPE aluminum cables
(b) 1 no. of 33 kV incoming/outgoing panel from/to RICB Subsation which shall be
connected with 3cx300 sq.mm XLPE aluminum cables
(c) 2 nos. of outgoing 33 kV panels shall be connected to 2x5 MVA, 33/11 kV
substation with 3Cx300 sq.mm XLPE aluminum cables.
(d) 1 no. bus section panel.
The switchgear shall be in two bus sections, each catering to 1 incomer and 1
outgoing (transformer feeder) with bus section breaker. In addition to the bus PTs on
each bus section, the incomers shall be provided with line side PTs. For the incomer
feeders and bus-section, the breaker control circuit shall incorporate following
suitable control schemes (LILO):
(a) Looping out the power to Olakha substation at the same time charging the
transformers (2x5 MVA, 33/11 kV)
(b) Closing of incomer-2 feeder breaker (see SLD) when incomer-2 line is dead, at
the same time feeding the transformers.
(c) Synchronizing two sources (i.e when feeding from RICB substation and
Olakha substation) through closing of bus coupler breaker.

These control schemes shall be duly taken care by the bidder during switchgear
drawing submission.
2.3 STANDARDS
2.3.1 The GIS switchgear shall comply with the latest amendments/revision of the
following standards or equivalent:
IEC 62271-200: High Voltage metal-enclosure switchgear

IEC 62271-100: High Voltage AC Circuit Breaker
IEC 60044-1: Current Transformer
IEC 60044-2: Voltage Transformer
IEC 62271-102: AC Disconnectors & Earthing Switches
IEC 60376: Specification and Acceptance of new sulphur hexafluoride
IEC - 68 (Part III) : Seismic test methods for equipments
IEC – 71: Insulation coordination.
IEC – 137: Bushing particulars.
IEC -270: Partial discharge measurements.
IEC –62271-303: Guide to the checking of SF6 taken for electrical equipments.
IEC –62271-1: Common Clauses for HV switchgear.
2.3.2 If there are, in the opinion of the bidder, any contradictions between the above
standards and these specifications, such contradictions shall be brought to the
attention at the time of bidding.
2.4 RATINGS
2.4.1 The ratings and general characteristics of the GIS shall be as follows:
(The ratings applicable to specific items of equipment are indicated in the applicable
sections dealing with the equipment).
(a) Type of Switchgear 36 kV Three phase, metal

enclosed, SF6 gas insulated
switchgear
(b) Location Indoor
(c) FREQUENCY 50 (-2% + 1%) Hz
(d) Rated voltage class, kV rms 36
(e) Highest System voltage 36 kV rms
(f) Number of phases Three
(g) Full wave impulse withstand voltage 170 kVp

(1.2/50 micro sec.)
(h) Rated one minute power frequency with

stand voltage

(i) Phase to earth 70 kV rms
(ii) Across open contacts 70 kV rms
(i) System earthing Effectively grounded
(j) Rated normal current

(i) Incoming circuits 850A
(ii) Out going feeder circuits 850 A
(iii) Bus coupler circuit 850 A
(k) Rated short circuit withstand current at Not less than 25 kA rms
rated maximum voltage for three second (symmetrical)
(l) Rated breaking capacity of circuit breaker 25 kA rms

(min)
(m) Rated making capacity (min) 63kAp
(n) Prospective transient recovery voltage As per IEC 62271-100

appearing across the circuit breaker
terminals
(o) Partial discharge level at 20 pico coulombs or less
1.1 Un/ 3
(p) Material of enclosure Stainless steel
(q) Material of bus bar Copper
(r) Insulation medium SF6 gas
(s) Guaranteed gas loss : < 1% per annum
2.4.2 All current carrying components of the equipment specified shall be capable of
continuous operation at the specified rated current without exceeding the maximum
temperature rise specified in the relevant IEC/IEEE standards.
2.5 GENERAL DESIGN AND SAFETY REQUIREMENTS
2.5.1 The switchgear shall be single busbar, SF6 insulated capable of continuous operation
under the climatic condition and altitude at the site.
2.5.2 The panel shall be of extendable type. The design shall be such as to enable bay
extension at either end with the minimum of disturbance to the installed equipment
and without complete shutdown of the switchboard.
2.5.3 The switchgear units shall be divided into several gas-filled compartments. The
equipment and connections will be arranged in such a way to allow ready removal and
replacement of any section with minimum isolation and disruption of adjacent
pressurized sections. This feature should also permit erection and testing of extension
units with the equipment in service with the minimum of outage time required.
2.5.4 The pressurized compartments shall be designed to minimize the risk of damage to
adjacent sections and protection of personnel in the event of a failure occurring within
the compartments. Individual compartments shall be equipped with pressure relief
devices.

2.5.5 A temperature compensated gas monitoring system with two alarm contacts shall be
furnished in each gas section to provide indication and alarm of the gas condition. The
gas monitoring system shall monitor the pressure and gas density of the SF6 gas
insulated apparatus. Both visual indication and alarm shall be provided with each gas
pressure monitors. Alarm circuit shall not respond to faults for momentary conditions
2.5.6 The gas loss per annum should be not more than 0.5% in any single gas compartment.
In case of extensive gas leakage during the defect liability period, BPC has the right to
request the contractor to replace the parts of the assembly which caused the leakage
without any cost implication to BPC.
2.5.7 The switchgear, which shall be of modular design, shall be fully gas insulated, all
Medium Voltage parts shall be insulated with SF6 gas. The conductors and the live
parts shall be mounted on high graded epoxy resin insulators. These insulators shall
be designed to have high structural strength and electrical dielectric properties and
shall be shaped so as to provide uniform field distribution and to minimize the effects
of particle deposition either from migration of foreign particles within the enclosures
or from the by-products of SF6 breakdown under arcing conditions.
2.5.8 The connecting points for the gas monitors shall also include connectors for
evacuation and gas filling.
2.5.9 Gas barrier insulators shall be provided so as to divide the GIS into separate
compartments. They shall be suitably located in order to minimize disturbance in case
of leakage or dismantling. They shall be designed according to IEC 62271-200 6.103.
The switchgear design shall confirm IAC AFLR. Gas section barriers shall be gas
tight and capable to withstand the maximum pressure differential that could occur
across the barrier. The support insulators and section barriers shall be of sufficient
strength to ensure that spacing and clearances are maintained when short circuit faults
occurs.
2.5.10 The material and thickness of the enclosures shall be such as to withstand an internal
flash over without burn through for a period long enough 1000ms till the backup relay
protection clears the fault. The material shall be such that it has no effect of
environment as well as from the by-products of SF6 breakdown under arcing
condition.
2.5.11 The material used for manufacturing the switchgear equipment shall be of the type,
composition and have physical properties best suited to their particular purposes and
in accordance with the latest engineering practices. All the conductors shall be
fabricated of copper bars of cross sectional area suitable to meet the normal and short
circuit current rating requirements. The finish of the conductors shall be smooth so as
to prevent any electrical discharge. The conductor ends shall be silver plated wherever
required to confirm the ratings as per IEC. The contacts shall be of sliding type to
allow the conductors to expand or contract axially due to temperature variation
without imposing any mechanical stress on supporting insulators.
2.5.12 The switchgear line-up when installed and operating under the ambient conditions
shall perform satisfactorily and safely under all normal and fault conditions. Even
repeated operations upto the permissible servicing intervals under 100% rated and
fault conditions shall not diminish the performance or significantly shorten the useful

life of the switchgear. Any fault caused by external reasons shall be positively
confined to the originating compartment and shall not spread to other parts of the
switchgear.
2.5.13 Bracings shall be provided for all mechanical components against the effects of short
circuit currents. The arc faults shall be positively confined to the originating
compartment and shall not spread to the other parts of switchgear.
2.514 The switchgear shall be of the free standing, self-supporting with easy accessibility to
all the parts during installation and maintenance, dead front design with all high-
voltage equipment installed inside gas-insulated metallic and earthed enclosures,
suitably sub-divided into individual arc and gas-proof compartments at least for:
(i) Busbars.
(ii) Circuit breakers.
2.5.15 The arrangement of the individual switchgear bays shall be such so as to achieve
optimum space-saving, neat and logical arrangement and adequate accessibility to all
external components.
2.5.16 It should be impossible to unwillingly touch live parts of the switchgear or to perform
operations that lead to arcing faults without the use of tools or brute force. All
mechanical operations shall be done with the door closed.
2.5.17 A comprehensive interlocking system shall be provided to ensure reliable and safe
operation of the substation. All interlocks that prevent potentially dangerous mal-
operations shall be constructed such that they cannot be operated easily, i.e. the
operator must use tools or brute force to over-ride them. Within one panel,
mechanical interlocking has to be provided and the three position switch must have
facilities to be operated manually.
2.5.18 The actual position of circuit breakers must be positively displayed by mechanical
indicators visible from the operating position. It shall be possible to remove the CB
without having to switch off the BB.
2.5.19 In general the contours of energized metal parts of the GIS and any other accessory
shall be such, so as to eliminate areas or points of high electrostatic flux
concentrations. The surfaces shall be smooth with no projection or irregularities,
which may cause visible corona.
2.5.20 The fabricated metal enclosures shall be of stainless steel and have high resistance to
corrosion, low electrical losses and negligible magnetic losses. All joint surfaces shall
be machined and all castings shall be spot faced for all bolt heads or nuts and washers.
All screws, bolts, studs and nuts shall conform to metric system.
2.5.21 Wherever required, the heaters shall be provided for the equipment in order to ensure
the proper functioning of the switchgear at specified ambient temperatures. The
heaters shall be rated for 230V AC supply and shall be complete with thermostat,
control switches and fuses, connected as a balanced 3-phase, 4-wire load. The
possibility of using heaters without thermostats in order to achieve the higher
reliability may be examined and accordingly decided during detailed design stage but
it shall be ensured that the temperature rise of different enclosures where heating is

provided should be within safe limits as per relevant standards. The heaters shall be so
arranged and protected as to create no hazard to adjacent equipment from the heat
produced.
2.5.22 The sealing provided between flanges of two modules/enclosures shall be such that
long term tightness is achieved.
2.5.23 All earthing systems will be designed to ensure safety and protection of all operating
and maintenance personnel during all normal and fault conditions.
2.5.24 Cable termination shall be of standard quality of international reputed make.
2.6 CIRCUIT BREAKERS
2.6.1 Type and Rating
2.6.2 The circuit breakers being supplied shall be suitable for operation with Transformers
and 33 kV Sub-transmission lines.
2.6.3 The CB shall be spring operated, motor charged and manually released spring closing
mechanism with three pole simultaneous operations. The speed of the closing
operation shall be independent of the hand-operating lever. The indicating device
shall be mechanical type directly linked to the mechanism and shall show the OPEN
and CLOSE position of the breaker visible from front of the cubicle without opening
any doors or covers
2.6.4 The “TRIP” and “CLOSE” coils shall be of reliable design and low consumption.
Anti-pumping relays and T-N-C switch/PB shall be provided for each panel.
2.6.5 Vacuum Type circuit breaker shall conform to IEC-56 and have the following
performance characteristics and ratings, in addition to those stated in Clause 4.0 of
this document.
(i) Type of breaker 36 kV three-pole, metal

enclosed, Vacuum Type
(ii) Rated frequency 50 Hz
(iii) Rated normal current: (Minimum)

 Bus coupler breaker 850 A
 Transformer incomer 850 A
breaker
 Out going line breaker 850 A
(iv) Number of poles 3
(v) Installation Indoor
(vi) Temperature rise As per IEC 694-1
(vii) Rated short time withstand current 25 kA for 3 second

kA (rms value of ac component)
minimum

(viii) Rated short circuit making current, 63kA
kA (peak) Minimum
(ix) Rated out-of phase breaking current 6.25kA

(rms)
(x) Rated short circuit breaking current

- Rated short circuit current 25 kA (rms)
- Percentage of DC component >37%
(xi) System Earthing Effectively earthed
(xii) First-pole-to clear factor >1.5
(xiii) Rated duration of short circuits 3 seconds
(xiv) Total break time for any current Not exceeding 60ms
upto the rated breaking current
(xv) Closing time < 100ms
(xvi) - Maximum difference of time at ±3ms

opening of series contacts within
one pole
- Maximum difference of time at ±3ms
opening between phases
- Maximum difference of time at ±3ms
closing between phases
(xvii) Rated transient recovery voltage for As per IEC 56
terminal faults
(xviii) Rated operating duty cycle 0-0.3 s-CO-3 min-CO
(xix) Rated line charging 50A with maximum

breaking current permissible
switching over voltage not
greater than 2.5pu
(xx) Operating mechanism Spring type

(xxi) Rated supply voltage of closing and 110 V DC
opening devices and auxiliary
circuit
(xxii) Number of auxiliary contacts 6 NO and 6 NC on each pole
wired to terminal blocks in
control cabinet
(xxiii) - Number of trip coils 2 per pole

- Number of closing coils 1per pole
(xxiv) Main contact material Copper (with silver plate

where required)

2.6.6 The governing data for the selection of circuit breakers shall not be limited to the
above mentioned parameters but shall also take into account various provisions
contained in these specifications and relevant standards.
2.7 CURRENT AND VOLTAGE TRANSFORMERS
2.7.1 CTs and VTs shall have polarity marks indelibly marked on each transformer and at
the associated terminal block. Facility shall be provided for short circuiting and
earthing the CT secondary at the terminal blocks.
2.7.2 CT's shall be easily accessible and interchangeable.
2.7.3 The CT ratios shall be furnished during detail engineering after the award of the work.
All the breakers including bus couplers are to be provided with the CTs.
2.7.4 Identification labels giving type, ratio, output and serial numbers shall be provided for
CTs and VTs.
2.7.5 VTs shall be of the single-phase type.
2.7.6 VT shall be connected by using isolators.
2.8 DISCONNECTING AND EARTHING SWITCHES
2.8.1 Disconnecting and earthing switches shall permit safe maintenance of any section of
the equipment when the remainder is live.
2.8.2 The disconnecting switch and earthing switch shall be of motor driven mechanism.
For safe isolation of the busbars and feeders, high speed fault making spring driven
disconnector/earth switch shall be provided. They will also have facilities for manual
operation and necessary operating handles shall be provided. The mechanical
operation of the disconnector switch must be possible with door closed for operator
safety.
2.8.3 All earthing switches shall be fully interlocked with associated circuit breaker and
disconnecting switches.
2.9 CABLE TERMINATIONS
Cable termination to be located at a convenient connection height. Outer cone-type

systems shall be preferred. Outer cone type in accordance with relevant international
standard for terminating cable of cross sections upto 1cx300 sq.mm upto to including
36 kV.
2.10 PROTECTION AND CONTROL SYSTEM
Refer “relays and protection” for details
2.11 INSPECTION AND TESTING

All the routine and acceptance tests as specified in the applicable standards shall be
carried out on the GIS switchgear, Circuit Breakers, CT, VT, disconnecting and
earthing switches. Test reports of all the bought items shall be reviewed during
testing. Type test of the switchgear shall be submitted by the successful bidder during
drawing approval.

2.12 COMPLETENESS OF THE EQUIPMENT
Any fittings, accessories or apparatus which may not have been specifically
mentioned in these specifications but are necessary for completeness of the equipment
shall be deemed to be included and shall be supplied without any extra charges to the
Employer. All plants and equipments shall be complete in all respects even if the
details regarding all the items are not mentioned in these specifications.
2.13 SPARES
BPC shall have option to order recommended essential spare parts as per the terms
and conditions of the contract. The spare parts shall be interchangeable and shall be of
same quality as that of original components.
2.14 GENERAL REQUIREMENTS
The relay shall be provided as per Section 7. The meters shall be provided as per
Section 6. The control wiring, indicating instrument, control and selector switches,
indicators, push buttons, termination and other equipment shall be as per Section 3.
CT’s and PT’s requiring special manufacturing and consideration for the use in GIS
shall be provided.
2.15 DRAWINGS/DOCUMENTS
In addition to the requirement of documents/drawings specified in the Volume 1, Part

2, contractor shall submit following drawings/documents after award of contract. Any
additional requirement found necessary shall be submitted.
i) Single line diagram indicating rating table, CT/VT characteristics

ii) GA, layout and foundation drawing
iii) Gas section diagrams/gas compartment scheme indicating all gas monitors,
rated alarm/lockout pressure, location of gas barriers etc
iv) Catalogues of all components in GIS and LV component, CT, VT gas
handling unit etc.
v) Installation manual for GIS, CT, VT, cable termination etc
vi) Operation and maintenance manual
vii) Factory Test Procedure for GIS, CT, VT , LV compartments etc
viii) Site test procedure for GIS, CT, VT , LV compartments etc
ix) Schematic diagram of GIS
x) Interlocking drawings
xi) Any other drawing/document found necessary during engineering and site
installation stage for proper coordination

3.0 33 KV and 11 KV INDOOR SWITCH BOARD
3.1 33 kV and 11 kV indoor switchboards shall comply with latest revision / amendments
of the following International Standards, including those referred to therein.
Metal enclosed switchgear IIS : 3427

Arrangement for switchgear busbars, main connection and
IIS: 5578,11353
auxiliary wiring
Busbar support insulators IS : 9431
Degree of protection IS : 3427
Current transformers IS : 2705
Potential transformers IS : 3156
A.C. electricity meters IS : 722
Electrical indicating instruments IS : 1248
Electrical relays for power system protection IS : 3231
Code of practice for phospating iron and steel IS : 6005
3.2 The technical parameters/data sheet of the MV Switchgear shall be as below:
DESCRIPTION Unit 33 kV Switchgear 11 kV Switchgear

General
Rated voltage, no. of phases kV / - 36 kV, 3 Phase, 11 kV, 3 Phase, 50
and rated frequency / Hz 50Hz Hz
Number of panels and As per BOQ As per BOQ

configuration
Indoor, Metal- Indoor, Metal-

Type enclosed, enclosed,
compartmentalized, compartmentalized,
draw-out type draw-out type
System neutral earthing Effectively Earthed Effectively Earthed
Rated Insulation Levels given below is upto 1000 m (shall be corrected as per
altitude)
Rated short duration power kV 70 28

frequency withstand voltage (rms)
Rated lightning impulse kV 170 75

withstand voltage (peak)
Rated normal current of busbars A/- 630, Copper 630, Copper

under design ambient
temperature of 30C and
material of busbar

Rated short-time withstand kA
current and time (rms) / 25 kA for 3 sec 18 kA for 3 sec
sec
Dynamic rating kA 62.5 45

(peak)
Constructional Requirements
Minimum thickness of sheet Frame & LT Frame & LT
steel in mm Cold rolled mm Compartment Compartment Doors–
(Frame/Enclosure/Covers) Doors– 2.5 2.5
Other Doors/Covers Other Doors/Covers –
Degree of protection of IP-4X IP-4X
enclosure
Colour finish shade - Interior RAL 7032 RAL 7032
& Exteriors
Cable connection Bottom entry and Bottom entry and exit
exit
Circuit Breakers
Type Vacuum Vacuum
Rated current inside the cubicle A 630 630
under design ambient
temperature at 40C
Rated operating sequence O–3 sec–CO-3 Min-CO
Rated short time breaking kA 25 18

current (rms)
Rated short time making kA 62.5 45
current (peak)
Rated short-time withstand kA 25 kA for 3 sec 18 kA for 3 sec
current and time (rms) /
sec
DESCRIPTION Unit 33 kV Switchgear 11 kV Switchgear

Rated peak withstand current kA 62.5 45
(peak)
Min. no. of spare auxiliary 6 NO + 6 NC after 6 NO + 6 NC after
contacts internal use by internal use by
manufacturer manufacturer
Type of operating mechanism
- Normal Spring charging for Spring charging for
closing and tripping closing and tripping
- Emergency Manual & Spring Manual & Spring

charged for closing charged for closing
and tripping and tripping
Auxiliary control voltage As per the site availability of DC supply

- Closing coil / Tripping coil V 110V DC 110V DC

- Spring charging motor V 110V DC 110V DC
- Space heater and lighting V 230V AC 230V AC
Earthing switch Earthing Truck to Earthing Truck to be
be provided provided
Current and Voltage Transformers

Details of ratio, taps, burden, As per Single Line As per Single Line
accuracy Diagram and BOQ Diagram and BOQ
(ratio to be decided (ratio to be decided
during detail during detail
engineering) engineering)
PROTECTIVE RELAYS
Type Numerical Numerical
Auxiliary supply V 110V DC 110V DC
Details of protective relays As per specification As per specification
METERS
Type Multi-Function Multi-Function
As per As per specifications.
specifications. 3 . 3 phase 4 wire with
Details of meters phase 4 wire with RS 485 port and
RS 485 port and optical port.
optical port.
** Note:
a. 11 kV switchgear shall have provision of extension from both sides.
b. Interlocking shall be provided based on the system operation which will be discussed
during detail engineering.
3.3 Busbars
3.3.1 Material of main and tap off busbars shall be of electrical grade and be of Copper.
3.3.2 Busbars shall be rated in accordance with the service conditions and the rated
continuous and short time current ratings specified in technical particulars/data Sheet.
Maximum temperature of the main busbars and busbar connections, under operating
conditions, when carrying rated normal current at rated frequency shall not exceed 90
Deg. C for joints/connections. Busbar temperature limits shall be adhered to without
forced cooling method. For tap off busbars, the current rating shall be at least equal to
corresponding breaker(s) rating.
3.3.4 Busbars shall be adequately supported on insulators, to withstand dynamic stresses

due to short circuit current. Busbar support insulators shall conform to IS 9431.

3.4 Circuit breakers
3.4.1 Circuit breakers shall be Vacuum type. Circuit breaker along with its operating
mechanism shall be mounted on a wheeled carriage moving on guides, designed to
align correctly and allow easy movement. Plugs and sockets for power circuits shall
be silver faced and shall be insulated with suitable insulating material shrouds. All
corresponding components of circuit breaker cubicles of same rating shall be
interchangeable with one another.
3.4.2 There shall be ‘Service’, ‘Test’ ‘Fully withdrawn’ positions for the breakers. In the
‘Test’ position the circuit breaker shall be capable of being tested for operation
without energizing the power circuits, i.e. the control circuits shall remain undisturbed
while the power contacts shall remain disconnected. Separate limit switches, each
having a minimum of 2 ‘NO’ + 2 ‘NC’ contacts, shall be provided for both ‘Service’
and ‘Test’ positions of the circuit breakers for future use.
3.4.3 Electrical tripping shall be performed by shunt trip coils. “Local/Remote” selector
switch lockable with keys in “Local” position shall be provided on the cubicle door.
`Red’ and `Green’ indicating lamps shall be provided on cubicle door to indicate
breaker close and open positions. Breaker “Service” and “Test” positions shall be
indicated by separate indicating lamps on the cubicle door. Indicating lamps shall be
provided for “R”, “Y” “B” phase indication, trip circuit healthy indication and spring
charged indication for circuit breaker.
3.4.4 Connection of the control / interlocking circuits between the fixed portion of the
cubicle and the breaker carriage shall be preferably by means of plug socket
arrangement.
3.4.5 Operating mechanism control
a) Circuit breakers shall be operated by a motor spring charging type of

mechanism. The mechanism shall be complete with motor, opening spring,
closing spring and all accessories to make the mechanism a complete
operating unit.
b) Operating mechanism shall normally be operated from the breaker cubicle

itself.
c) The tripping spring shall be charged by the closing action, to enable quick
tripping. Closing of the circuit breaker shall automatically initiate recharging
of the springs to enable the mechanism to be ready for the next closing stroke.
Charging time for the springs shall not exceed 30 seconds. It shall be possible
to manually charge the springs in an emergency. Transfer from motor to
manual charging shall automatically disconnect the charging motor. All
operating mechanisms shall be provided with "ON" - "OFF" mechanical
indication. The charging mechanism shall be provided with mechanical
indicators to show "charged" and "discharged" conditions of the spring.
Failure of any spring, vibration or mechanical shock shall not cause tripping or
closing of the circuit breaker.

d) Only one closing operation of the circuit breaker shall result from each closing
impulse (manual or electrical), even if the breaker trips while the control
device (manual or electrical) is being held in the "close" position.
e) The circuit breaker mechanism shall make one complete closing operation,
once the push button (PB) or control switch has been operated and the first
device in the control scheme has responded, even though the PB or control
switch is released before the closing operation is complete, subject to the
condition that there is no counter- impulse for tripping.
f) Means shall be provided to manually open and close the breakers slowly,
when the operating power is not available, for maintenance and adjustments.
A local manual trip device shall also be provided on the operating mechanism.
g) Circuit breaker control shall be on 48 V DC or 110 V as per the availability of

DC supply at the site. Closing coils and other auxiliary devices shall operate
satisfactorily at all voltages between 85-110 % of the control voltage. Trip
coils shall operate satisfactorily between 70 -110 % the rated control voltage.
3.4.6 Safety interlocks and features
a) Withdrawal or engagement of a circuit breaker shall not be possible unless it is

in the open position.
b) Operation of a circuit breaker shall not be possible unless it is in service

position, withdrawn to test position or fully drawn out. It shall not be possible
to close the circuit breaker electrically in the service position, without
completing the auxiliary circuit between the fixed and moving portions.
c) Circuit breaker cubicles shall be provided with safety shutters operated

automatically by the movement of the circuit breaker carriage to cover the
stationary isolated contacts when the breaker is withdrawn. Padlocking
facilities shall be provided for locking the shutters positively in the closed
position. It shall, however, be possible to open the shutters intentionally
against spring pressure for testing purposes.
d) The circuit breaker carriage shall be earthed before the circuit breaker reaches
the test position from fully withdrawn position. In case of breakers with
automatic disconnecting type of auxiliary disconnects, the carriage shall be
earthed before the auxiliary disconnects are made and the carriage earthing
shall break only after the auxiliary disconnects break.
e) Caution nameplate, “Caution Live Terminals” shall be provided at all points

where the terminals are likely to remain live and isolation is possible only at
remote end, i.e. incomer to the switchboard. Suitable interlock shall be wired
for the purpose.
3.5 Current and Voltage Transformers
3.5.1 CTs and VTs shall have polarity marks indelibly marked on each transformer and at
the associated terminal block. Facility shall be provided for short circuiting and
earthing the CT secondary at the terminal blocks.

3.5.2 CT shall be able to withstand the thermal and mechanical stresses resulting from the
maximum short circuit current. Core laminations shall be of high-grade silicon steel.
3.5.3 VTs shall be of the single-phase type and mounted on a drawout trolley. VTs shall be
protected on their primary sides by 3A HT fuses. MCB having auxiliary contact shall
be provided on secondary. Primary side fuses shall be replaceable only in the de-
energised position.
3.5.5 Identification labels giving type, ratio, output and serial numbers shall be provided for
CTs and VTs.
3.5.6 The CT ratios shall be furnished during detail engineering after the award of the work.
All the breakers including bus couplers are to be provided with the CTs.
3.6 Constructional Features of Switchboard
(Applicable for other types of panels/distribution boards etc)
3.6.1 Switchboard manufacturing shall be CNC machine based. Switchboard design shall
comprise metal enclosed, fully compartmental execution having separate sections for
each circuit. Compartments with doors for access to operating mechanism shall be so
arranged as not to expose high voltage circuits. Switchboard cubicle shall be provided
with hinged door on the front with facility for locking door handle.
3.6.2 Switchboard shall be dust and vermin-proof and shall have a degree of protection of
enclosure of IP 4X.
3.6.3 All removable covers shall be gasketed all around with neoprene or superior gaskets.
3.6.4 Instruments, relays and control devices shall be flush-mounted on hinged door of the
metering compartment located in the front portion of cubicle. The metering
compartment shall be properly shielded to prevent mal-operation of electronic
equipment such as numerical / static relays due to electro-magnetic fields. Separate
signal earth shall be provided for such devices, if necessary.
3.6.5 Each switchboard cubicle shall be fitted with a label on the front and rear of the
cubicle. Each switchboard shall also be fitted with label indicating the switchboard
designation, rating and duty. Each relay, instrument, switch, fuse and other devices
shall be provided with separate label. The labels shall be of Anodized Aluminum.
3.6.6 Sheet steel used for fabrication of switchboards, control cabinets, marshalling boxes,
etc shall be cold rolled.
3.6.7 All panels, cabinets, kiosks and boards shall comprise rigid welded/bolted structural
frames made of structural steel sections or of pressed and formed cold rolled sheet
steel of thickness not less than 2.5 mm. Stiffeners shall be provided wherever
necessary.
3.6.8 All removable covers, gland plates, etc. shall be of at least 2 mm thickness and shall
be gasketed all round the perimeter. All the doors shall be of 2.5 mm thickness.

3.6.9 All floor mounted panels / boards shall be provided with a channel base frame.
3.6.11 It shall be possible to extend the switchboard on both sides.
3.6.12 The fully draw-out modules shall have all the circuit components mounted on
withdraw-able type steel chassis. All power and control connections shall be of the
draw-out type. It shall be possible to withdraw the chassis mounted circuit
components without disconnecting any connections. All draw-out contacts shall be of
silver plated copper.
3.6.15 After isolation of the power and control connections of a circuit, it shall be possible to
carry out maintenance in a compartment safely, with the busbars and adjacent circuits
alive.
3.6.16 Compartments with doors for access to operating mechanism shall be so arranged as
not to allow access to high voltage circuits. Switchgear cubicle shall be provided with
hinged door on the front with facility for padlocking door handle.
3.7 Earthing
3.7.1 A earthing bus of 50 x 6 sq.mm copper shall be provided and extended throughout the
length of the switchboard. It shall be bolted to the framework of each unit and brazed
to each breaker earthing contact bar. It shall be located at the bottom of the board.
3.7.2 The earth bus shall have sufficient cross section to carry the momentary short circuit
and short time fault current for at least 1 second without exceeding maximum
allowable temperature rise. The earth bus shall be properly supported to withstand
stresses induced by the momentary short circuit current.
3.7.3 Suitable clamp type terminals at each end of the earth bus shall be provided to suit the
size of the earthing conductors.
3.7.4 Bolted joints, slices, taps, etc. to the earth bus shall be made with at least two bolts.
3.7.5 Positive earthing of circuit breaker frame shall be maintained when it is in the
connected position and in all other positions whilst the auxiliary circuits are not
totally disconnected.
3.7.6 Hinged doors shall be earthed through flexible earthing braid of adequate cross
section.
3.7.7 All non-current carrying metal work of the switchboard shall be effectively bonded to
the earth bus.
3.7.8 Positive connection of the frames of all the equipment mounted in the switchboard to
the earth busbar shall be maintained through insulated conductors of size equal to the
earth busbar or the load current carrying conductor, whichever is smaller.
3.7.9 All instrument and relay cases shall be connected to earth busbar by means of
650/1100 V grade, green coloured, PVC insulated, FRLS stranded, copper, 2.5 sq.
mm conductor looped through each of the earth terminals.

3.8 Circuit / busbar earthing facility
3.8.1 It shall be possible to connect each circuit or set of 3 phase busbars of the switchboard
to earth through earthing switches.
3.8.2 Earthing switches / earthing devices shall be mechanically interlocked with the
associated breakers to prevent accidental earthing of live circuit or busbars.
3.8.3 In case the earthing facility comprises earthing trucks to be inserted in place of circuit
breakers, separate earthing trucks shall be supplied for each type / size of breaker
without any cost implication to BPC.
3.8.4 The earthing facilities proposed to be provided by the Bidder shall be clearly detailed
in the Bid and shall be subject to Employer's approval.
3.8.5 Auxiliary contacts (min. 2 NO + 2 NC) shall be provided on each earth switch /
earthing device and shall be wired to the terminal block for interlocking purpose.
3.9 Instruments
3.9.1 All electrical instruments and meters shall comply with IS 722.
3.9.2 All indicating and recording instruments shall be flush mounted in dust proof cases
complying with IEC 60068 and dimensions to IEC 61554.
3.9.3 Metering and indicating instruments
Multifunctional meter for functions as shown in the single line diagram/specifications

shall be provided. It shall be 3 phase 4 wire with RS 485 port and optical port. It
shall be provided with separate 3 phase 4 wire type test blocks for the testing of
meters without disturbing the CT and VT secondary connections. The accuracy of the
meters shall be 0.5 or better and capable of displaying maximum demand (kW/kVA).
The detail specification of meter is attached in Section 7.
3.10 Control and Selector Switches
3.10.1 Control and instrument switches shall be rotary type, provided with escutcheon plates
clearly marked to show operating position and suitable for semi-flush mounting with
only the switch front plate and operating handle projecting out. The connections shall
be from the back. The contact assembly at the back of the switch shall be enclosed in
dust tight removable covers.
3.10.2 Contacts of the switches shall be spring assisted and contact faces shall be of silver /
silver alloy. Springs shall not be used as current carrying parts. Contact rating and
configurations of the switches shall be adequate for the functions desired.
3.111 Indicating lamps / pilot lights
3.11.1 Cluster type LED lamps of 22 mm dia. of suitable voltage shall be provided.
3.11.2 The basis of colours shall be as follows:

Red : Flow of energy.
Green : No flow of energy.
White : Supervision of power available, relay coil healthy, etc.
Amber : Disagreement with original condition, ‘abnormal’ condition or
‘sequence–on’ condition.
The following indication shall be provided: Service positions, Test position, PT Fuse
fail, Auto Trip, TC Healthy, Spring charged, breaker off and breaker on.
3.12 Push buttons
3.12.1 Push buttons shall be of momentary contact type with rear terminal connections. All
push buttons shall have independent, potential free, 2NO + 2NC contacts. The contact
faces shall be of silver / silver alloy. The contacts shall be rated 10A and capable of
breaking inductive load of 1A at 110V DC.
3.12.2 Push button for emergency tripping of the circuit breaker shall be provided.
3.13 Space Heaters
3.13.1 Adequately rated anti-condensation space heaters shall be provided for each
switchboard / cubicle.
3.13.2 Space heater shall be of the industrial strip continuous duty type of rating 100 W
(minimum), rated for operation on a 230 V, 1 phase, 50 Hz, AC system.
3.13.3 Space heater shall be provided with a single pole MCB with overload and short circuit
release, a neutral link and a thermostat.
3.14 Cubicle Lighting / Receptacle
3.14.1 Each cubicle shall be provided with interior lighting by means of 11 W CFL lighting
fixture. An MCB shall be provided for the lighting circuit. The lighting fixture shall
be suitable for operation from a 230 V, 1 ph, 50 Hz, AC supply.
3.14.2 A 230 V, 1 phase, AC receptacle (socket) plug point shall be provided in the interior
of each panel with an MCB.
3.15 Power and Control Cable Terminations
3.15.1 Terminals for power connections shall be complete with adequate phase segregating
insulating barriers, shrouds and suitable crimping type of lugs for terminating the
cables.
3.15.2 Double compression type glands with armour and bonding clamps for the termination
of all solid dielectric multicore cables shall be provided.
3.15.3 Cable terminations for MV cables shall be heat shrinkable type. Adequately sized
shrouds / bolts shall be provided at connections to completely cover the terminations.

3.16 Wiring for Control and Protective Circuits
3.16.1 All low voltage wiring for control, protection and indication circuits shall be carried
out with 650/1100 V grade, PVC insulated cable with stranded, copper conductor of
minimum 1.5 sq. mm size. The size of conductor for CT circuits shall be minimum
2.5 sq. mm.
3.16.2 All wiring shall be run on the sides of panels and shall be neatly bunched and cleated
without affecting access to equipment mounted in the panel.
3.16.3 The wiring shall be bound and supported by clamping, roughing or lacing. Spiral
wrapping will not be accepted. Wireways shall not be more than 50% full. Adequate
slack wire shall be provided to allow for one restripping and reconnection at the end
of each wire. screened cables or wires are necessary, an insulating sheath shall be
included.
3.16.4 Wiring and supports shall be of fire resistant material.
3.16.5 Wiring shall only be jointed or teed at terminals. Terminals of the clamp type shall not
have more than two wires connected.
3.17 Terminations and Ferrules
3.17.1 Engraved core identification ferrules, marked to correspond with the wiring diagram,
shall be fitted to each wire and each core of multicore cables terminated on the panels.
The ferruling must be as per BEBS-S12 (1964).
3.17.2 Moisture and oil resisting insulating material shall be used. The ferrules shall be of
the interlocking type and shall grip the insulation firmly without falling off when the
wire is removed.
3.17.3 All wires forming part of a tripping circuit shall be distinctively marked.
3.17.4 Spare auxiliary contacts of electrical equipment shall be wired to terminal blocks.
3.18 Control Wiring Terminal Blocks
3.18.1 Terminal blocks shall be of 1000 V grade and stud type. Brass stud of at least 6 mm
dia. with fine threads shall be used and securely locked within the mounting base to
prevent turning. Each terminal shall comprise two threaded studs, with a link between
them, washers, and matching nuts and locknuts for each stud. Connections to the
terminals shall be at the front.
3.18.2 Terminals shall be numbered for identification, grouped according to function.

Engraved ‘black on-white’ labels shall be provided on the terminal blocks describing
the function of the circuit.
3.18.3 Terminals for circuits with voltage exceeding 110 V shall be shrouded. Terminal
blocks at different voltages shall be segregated into groups and distinctively labeled.
3.18.4 Terminals used for connecting current transformer secondary leads shall be
‘disconnecting and shorting’ type with a facility for earthing the secondary.

3.18.5 Terminal blocks shall be arranged with 100 mm clearance, between any two sets.
3.18.6 Separate terminal stems shall be provided for internal and external wiring
respectively.
3.19 Electronic Equipment
3.19.1 Electronic equipment shall be capable of withstanding randomly phased transient over
voltages of either polarity on the power supply or interruptions of the power supply
without damage or impairment to the equipment's subsequent performance. In the
case of controls, no mal-operation shall occur.
3.19.2 Where manufacturers require that electronic equipment supplied under this Contract
should not be subjected to insulation resistance tests ('Meggering'), suitable warning
notices shall be provided and installed in appropriate locations. When specified by
manufacturers, separate shield / signal earthing shall be provided.
3.19.3 It shall be possible to remove / replace cards from / to electronic equipment without
damage and without interfering with the operation of the rest of the equipment or
system. If necessary, consideration should be given to switching off the supplies
locally to a card to prevent inadvertent interference to the equipment or system during
removing / replacing a card.
3.19.4 Setting-Up and Maintenance Facilities
a) All equipment shall be provided with sufficient easily accessible test points to
facilitate setting-up and fault location together with maintenance aids such as
extension boards, jumper leads and special maintenance tools.
b) Pin or terminal numbering of all cards in all crates shall be consistently

uniform throughout. Power supplies shall use the same pin positions on all
cards in an equipment or system.
3.19.5 Component Identification
a) A component reference number shall be marked adjacent to each component.

Where this is impossible, components shall be identifiable from the layout
drawings provided.
b) The following shall be marked in all instances:
i. MCBs
The rating and the circuit identification of each fuse shall be marked
adjacent to the MCBs base.
ii. Control, Protection and Indication Devices

The function of each control, protection and indication device shall be
marked. The caption and its arrangement shall be subject to the
approval of the Engineer.
iii. Connectors

The diagram reference number shall be marked on or adjacent to each
connector.
c) Test points shall be individually marked with the diagram reference number.
3.20 Test Terminal Blocks
Test terminal blocks, if any, shall be provided for secondary injection and testing of
relays/meters.
3.21 MCBs
Each control panel shall be provided with the necessary arrangement for receiving,
distribution and isolation for DC and AC supply for various control, signaling and
lighting. It is proposed to have MCBs only instead of fuses. An indication for the PT
MCB failure shall be provided.

4. RELAY AND PROTECTION
The relay provided shall be as mentioned below. Besides, numerical relay for primary
Protection, Master Trip relay (Numerical) and Trip Circuit Supervision relay shall be
provided.
4.1 General requirements of protection
a) The price of the bid shall include whether explicitly mentioned or not,
all the elements necessary to coordinate and assure the correct
functioning of the protection, high reliability, selectivity, very short
fault clearance time, and precisely dimensioned to the protected objects
these tender specifications and scope of work.
b) Modern relays employing state of the art technology & proven

numerical design shall be offered by the bidder. They shall be of
standard construction and supplied by an experienced and reliable
manufacturer indicated in the list of approved vendors. The relays
shall be designed for use with modern digital telecommunication
system conforming to ITU-T recommendations and fibre optic
medium.
c) The type of relays/ devices, which are implemented to perform a

particular function, shall be the same for all feeders in each system
voltage level within the contract in question.
d) Combination of two or more types of relays in a single unit is not

normally acceptable since any fault or component failure may lead to
loss of both or all functions respectively. However, when a modern
integrated Numerical Multifunction Combined Protection equipment is
offered, 100% redundancy shall be provided against the contingencies
which lead to the loss of whole protection system.
e) In addition to all components, the contractor shall supply the necessary

documents and calculations of settings to guarantee the correct
functioning of the protection equipment without exceeding the safe
limits of the system operation or the equipment condition. Before the
production of the current transformer commences, the Contractor shall
submit for approval a verifiable calculation based on the design short
circuit level of the substation, 18 kA at 11 kV, 25 kA at 33 kV and a
network time constant not lower than 80 msec. to demonstrate that the
offered protection, will be stable for faults outside the zone, will trip on
the range of required tripping time and that the protection has
sufficient sensitivity to work together with the offered CTs.
4.2 Features of Numerical Relays
a) The connection from the relays to the communication port shall be

with RS485. The bidder shall indicate the maximum permissible
distance and type of cable for this type of connection. Bidder shall
provide two ports for the same.

b) An additional electrical or optical port shall be provided for the relays,
to directly connect the signal to auxiliary channel of OLTE (optical
line terminal equipment) bypassing the multiplexer or for redundancy
purpose.
c) The relays shall have communication port for remote monitoring,

programming and control. Bidder shall indicate the type of protocol for
this connectivity.
d) It shall be possible to programme and set the relays locally as well as

from remote end. It shall also be suitable for serial interfaces and
software shall be provided to achieve this function through personal
computer (PC). This shall have facility for both hand- held
programmable device as well as PC based unit with necessary
software.
e) The sampling frequency for analog signals shall be minimum 2 kHz.

Filtering and measuring techniques shall be used to ensure correct
performance during all operating and transient conditions.
f) The output and input sections shall be electrically isolated.
g) Under 'alarm' conditions of outputs, programmable options shall be

available to set the output to trip /inactive/ none/ previous state
condition.
h) The relays shall be provided with fault disturbance recorder event

recorder, which can store 500 time tap events, and fault recorder with
date and time stamping.
i) The relay shall have remote communication facility. The interface shall
ensure high dependability for genuine tripping signals and high
security against spurious trip signals necessary in protection
applications even if communication channel is disturbed.
j) Bidder shall advise the Employer on the details of error performance

characteristic and protocols used to ensure error free operation.
k) Additional potential free contacts for all the Relay output i.e. trip as
well as alarm signals shall be provided for connection to SCADA in
the future.
l) The modules shall have transmit and receive counters for each
command such that the counter is incremented by actual output
command. This shall help in analysis of problems. The counter
information shall be in a non-volatile memory. Resetting the counter
shall be possible only with authorized access.
m) The relay shall have continuous automatic self-monitoring and

alarming facilities. The above feature shall not affect the relay
availability i.e. when an actual fault occurs in the system during the
checking cycle, the above cycle shall be immediately interrupted and

the relay shall check and respond to the system fault. The system shall
have the following visual indications for supervision of each command
channel.
Input activated at transmit end, Command transmitted and received,

Equipment in local and remote loop test, Test pass, Test fail, General
alarm, and Equipment in synchronism.
n) Each protection channel shall run an automatic loop test at regular

intervals to monitor operational readiness. An unsuccessful test shall
signal the alarm and block the command output. Also, if the system
monitor detects any fault in the transmission, the protection command
shall be blocked and alarm signaled.
o) Suitable event logs memory and down loading facility shall be

available.
4.3 Miniature circuit breakers (MCBs) shall be used in VT secondary circuits,

they shall have 2 NO and 2 NC auxiliary contacts for blocking trip circuits of
voltage dependent protection and annunciation. Where high-speed protection
is involved, the speed of operation of MCB shall be less than 5 milli seconds.
4.4 The DC distribution system which feeds the protection shall be proper so that,
the rating of the up-stream MCBs shall be chosen higher than that for the
down- stream ones and the coordination between the up-stream MCBs with
the down-stream ones shall exist. DC supply to trip coils shall be separately
fused in case of single DC supply. Two independent feeders from the
independent batteries shall be provided. An auto-changeover facility shall be
provided so that in case of failure of one power source, other shall cut in
automatically.
4.5 Both positive and negative of the auxiliary voltage shall be switched when trip
or close operation is executed in the substation switchgear.
4.6 The external protection circuits shall use the standard available substation
battery voltages. The voltage of the protection DC/DC converters shall never
be used for external protection circuitry.
4.7 The new protection system shall be completely wired, tested and inspected at
the factory. The only work to be performed at site shall be the connection to
external devices, the commissioning procedure and site tests.
4.8 The continuity of all tripping circuits shall be continuously supervised for both
close and open breaker status. The failure of any component of the supervision
shall lead to trip the breaker. The lock out relays shall also be supervised.
4.9 No time delay for the tripping contacts will be acceptable. Where a master trip
relay, lock-out relay or any auxiliary relay is utilized, it shall have a maximum
tripping time equal to or less than 10 ms. To avoid the additional time delay of
the above relay on the total tripping time of the main protection, an
arrangement shall be made so that the main protection shall perform the circuit
breaker tripping along with energizing the lock-out relay in a parallel circuit
arrangement.

4.10 The tripping of the back-up protection of each feeder shall be relayed by
different control cables and as far as applicable, through different routes.
4.11 All relays shall have clear identification on the associated panel by well-
written inscription plates. Where indications are provided by flag relays or
LEDs, these shall also be specifically identified by permanently fixed
inscription adjacent to them.
4.12 The supervision relays shall indicate an alarm and also a visual indication in
the case of trip operation of the relay, DC supply failure, DC/DC converter
failure, interruption in the trip circuit wiring and all alarm signals of the relay.
4.13 The tripping contacts of the protection relays shall reset automatically if no
further fault conditions are present, whereas the signaling and blocking close
order of the circuit breaker remains until the operator resets the relay
manually.
4.14 Each indicator, whether of the electrical or mechanical type shall be capable of
being easily reset by hand without special tools, opening the relay cover,
bridging of some back/internal terminals or drawing-out the relay.
4.15 Before starting with the wiring diagrams, the contractor shall supply block
diagrams in one drawing for each type of feeder and protection. These
drawings shall include information concerning control circuits, tripping
scheme, interlocking scheme, secondary circuits of voltage and current
transformers, DC power supply, supervisory alarms and tele-protection
circuits. These block diagrams shall be updated during the factory testing,
erection and commissioning phases.
4.16 The contractor shall supply the setting data sheets of the supplied protection
equipment showing the coordination with the rest of the network one-month
before commissioning.
4.17 SPECIFIC DESCRIPTION OF PROTECTION
Transformer differential protection for 5 MVA, 33/11 kV transformer.
a) This protection shall trip for all the phase and earth faults inside the zone and
shall have to be stable for all faults outside the zone limited by the current
transformers. This protection shall have restrained inrush-proof feature, which
shall never prevent operation for tripping in case if a real fault exists within
the relay zone during energization of the power transformer.
b) This protection shall be immune to the zero sequence current, which may
circulate, during certain conditions through the neutral of only one side of the
transformer. It shall be a modern phase segregated relay of low burden with
absolute stability at switchgear designed short circuit current rating and
tripping time of not more than 25 m.sec, at flow of one side current equal to
twice the nominal current. The tripping contactor of the relay shall have
sufficient number of contacts of suitable switching capacity to trip all the

circuit breakers which are supposed to be tripped through this protection and
initiate the lock-out relay.
c) The setting of bias and basic setting must be adjustable in steps in order to
cover the maximum mis-match between the HV and LV due to error of the
CT's and range of regulation of the tap changer.
d) This protection should be wired to enable the measurement of differential and

stabilization current in service without any possibility of causing open circuits
on the secondary side of the current transformers.
e) It shall have a visible annunciator, which will be reset by push button and shall
be located on the relay.
f) Although the CT ratio and vector diagram correction for the input currents to
be performed within the relay itself. External interposing current transformers
is not required.
g) The CT shall be of class PS or X.
Restricted Earth Fault Protection 5 MVA, 33/11 kV transformer.
a) The restricted earth fault relay shall be operated from a completely separate
core of line and neutral current transformers. The dedicated CTs shall be of
class PS or X and have same magnetization characteristics with a knee emf
value higher than the highest possible setting of the relay. Intermediate CTs
for ratio correction are not acceptable. CT sizing shall be matched with
requirements from the relay.
b) For this protection, 1-phase high impedance relay will be provided and all the
aspects regarding stability of the protection, dimensioning of current
transformer, considering the peak short circuit current, etc. and all the
auxiliary equipment such as non-linear VDR resistor for voltage limiting, filter
for harmonics and DC component suppression and variable shunt resistor for
sensitivity adjustment if required shall be considered for the tender. The total
fault clearing time shall not exceed 20 m.sec. at 3IN.
c) Tripping of this protection shall activate all the circuit breakers surrounding
the power transformer and all the material such as surge-proof inter-tripping
relays if necessary, cables, test terminals, erection work, etc. is part of the
scope of this protection.
d) The stability of this protection against out-zone faults shall be confirmed. A

calculation to show the proper dimensioning of the relay upto the maximum
short circuit of the switchgear shall be submitted.
Auto-synchronising relay (for 33 kV incoming feeders and 33 kV & 11 kV

bus couplers)
a) This relay not only monitors the pre-conditions for synchronising, but also
activates on-line correction signals, if necessary, to satisfy the conditions for
synchronising.

4.18 Overcurrent/ Earth Fault Protection (for Transformer, Incoming and
outgoing line feeders and Bus coupler)
a) This relay shall be of the electronic/numeric multi-characteristics type which

has a flexible mode selection facility so that, it shall be possible to select a
certain mode for the over current elements and a one for the earth fault
element.
b) Phase current range shall cover at least 50-300% of-IN in steps of not more
than 10% while the earth current range shall cover at least 5-100% of IN in
steps of not more than 5%.
c) The time setting range of the definite time mode shall not be less than 5
seconds in steps each of 0.1 second.
d) The time multiplier setting for the inverse time-current characteristic modes
shall have a range not less than 0.05- 1.6 in steps each < 0.05.
e) Overcurrent and earth fault relays shall have separate timers and operation
indicators.
f) The high set element shall have a range of 2 - 15 times the nominal current at
least in steps of 1 IN shall be of low transient overreach, with a tripping time of
less than 25 ms and possible to be selected on "blocked" position. Reset time
shall be not more than 50 ms for both elements.
g) The relays, which shall be installed on the transformer neutral side, shall be
from single-phase version, but they shall have the same characteristics as the
phase ones. The transformer neutral earth fault relay shall trip both
transformer breakers.
4.19 Auxiliary Relay
a) Voltage operated relays with sufficient contacts to initiate tripping, alarm,

annunciation and logging for various trip functions like Buchholz relay
operation, high oil temperature, high winding temperature, pressure relief
valve operation, etc. shall be provided. Each relay shall have four (4) pairs of
self-reset contacts except for Buchholz and "PRD" trip, which shall have hand,
reset contact. The relays shall have hand reset operation indicators.
b) Voltage operated relays with sufficient contacts to initiate alarm and data
logging for various alarm functions for transformers, etc. shall be provided.
Each relay shall have four (4) normally open self-reset contacts. The auxiliary
relay for Buchholz alarm shall be slugged to have delay on drop off at 100 ms.
The relays shall have hand reset operation indicator.
4.20 Specific protection requirements
33 kV Incomer and outgoing feeders – 67(AC directional over current Relay),

50 (Instantaneous over current relay), 51 (Overload relay), 49 (Thermal
overload relay), 37 (Undercurrent or Underpower Relay), 46 (Reverse phase /
phase balance current relay), 67N (Neutral directional over current relay) 50N

(Neutral instantaneous over current relay), 51N (Neutral time over current
relay), 32N (Wattmetric Zero-sequence directional relay), 59N (Neutral over
voltage relay), 27 (Under voltage relay), 59 (Over voltage relay), 50 BF
(Breaker failure), 86 (Locking-out relay), 25 (Synchronizing or Synchronism-
Check Device).
Transformer Protection for 5 MVA, 33/11 kV transformer– 87 (Differential

Protective Relay), 50 (Instantaneous over current relay), 51 (Overload relay),
49 (Thermal overload relay), 27 (Under voltage relay), 59 (Neutral over
voltage relay), 81 (Frequency relay), 24 (Volts-per-hertz relay/ over fluxing),
64 (restricted earth fault protection)
Master trip relay – for all the breakers.

Trip Circuit Supervision – for all the breakers.
4.21 Tests
All routine tests shall be carried out on the assembled switchboard / panel during
inspection at the manufacturer’s works as per applicable standards. Test reports for
bought out items shall be presented for review/acceptance during testing. The bidder
shall submit type test reports during the detail engineering which is less than 5 years
old. In case the type tests reports are of the tests conducted earlier than five (5) years
prior to the date of Bid opening, the Contractor shall repeat these test(s) at his cost.

5. METER SPECIFICATIONS FOR THE 33 KV & 11 KV BREAKERS.
Multifunctional meter for functions as shown in the single line diagram/specifications shall
be provided. It shall be 3 phase 4 wire with RS 485 port and optical port. It shall be provided
with separate 3 phase 4 wire type test blocks for the testing of meters without disturbing the
CT and VT secondary connections. The accuracy of the meters shall be 0.5 or better and
capable of displaying maximum demand (kW/kVA). The detail specifications of meter are as
follows:
5.1 Applicable Standards
The bidder shall supply Fully Static Intelligent Energy Meter with GSM/GPRS support.
The static meter shall be manufactured and tested in accordance with the latest edition of
the following standards:
a. IEC 60687: Alternating current static watt-hour meters for active energy (classes
0.2 S and 0.5 S)
b. IEC 61036: Alternating current static watt-hour meters for active energy (classes 1
and 2)
c. IEC 61268: Alternating current static var-hour meters for reactive energy (classes
2 and 3)
d. IEC 61107: Data exchange for meter reading, tariff and load control direct local
data exchange
5.2 SERVICE CONDITIONS AND INSTALLATION
The static meter (The meter) shall be dust-proof type and installed in a cabinet, and
suitable for operation under the following conditions:
Altitude : up to 2,400 m above sea level
Ambient air temperature : from -10 up to 40C
Average Daily Ambient Air Temperature : 25C
Relative humidity : from 20% – 100%
Climatic condition : Varied, from tropical to severe winters
Average Annual Rainfall (mm) :1390 mm
The overall climate condition is moderately warm, dusty and humid, conducive to rust
and fungus growth.
5.3 General Features.
a) Accuracy class shall be class 0.5 or better.

b) Measurement mode shall be able to measure the power for 3 phase 4 wire and 3 phase
3 wire.
c) CT range – 1/5 Amps.
d) Data storage shall be through Flash RAM.
e) Equipment Failure Alarms shall be provided.
f) The meter shall be bidirectional for net metering.
g) The meter shall have capability for programming from the remote to change the
various parameters such as tariffs.
h) The energy value shall be directly computed without having to put the multiplying
factor.

5.4 MOUNTING PROVISION
The meter is to be mounted on the panels.
5.5 MECHANICAL REQUIREMENTS
a. Maximum demand zero reset

The maximum demand zero reset shall be manually initiated via the sealable demand
reset button.
The maximum demand shall be automatically reset at predefined date after self-
reading.
b. Terminal and terminal block
Terminals shall be of high-conductivity brass with nickel plated or tin plated and
suitable for the sizes of insulated cables to suit the site requirements.
c. Potential circuit (direct-connected type)
The connection point(s) of potential circuit, test link(s), shall be only made inside the
meter cover.
d. Meter and Terminal cover
The meter shall have provision for sealing and anti-theft features. The terminal cover
shall be suitable for incoming and outgoing cables.
e. Nameplate
The inscription on nameplate shall be marked in English according to the relevant
standard, and marked with three (3) additional marks as follows:
i. SUPPLIED BY:
ii. BPC No.: (The number to be marked on the nameplate shall be given by BPC
after the final of bid consideration.)
iii. Barcode shall be the similar ones used by the billing and shall be given to the
supplier.
5.6 REGISTER UNIT
The register unit shall be an all solid-state microprocessor based register with internal
memory of programmable and reprogrammable type. The internal memory shall be non-
volatile semi-conductor type.
The register display shall be at least 6-digit LCD display with three (3) decimal points
for power and two (2) decimal points for energy (programmable). The dimension of
LCD display and number on LCD display shall be as per IEC standard.
The register unit shall be able to process data in at least two (2) following programmable
modes:
(i) To display the real time data and check the status of the meter
(ii) To store and display the billing data for at least 60 days and the same shall be
retained in case of power failure.
The register unit shall have the following display operating modes:
(i) Scroll mode
The selected display data such as kW, kVar etc. shall be continuous sequence to
display each data automatically for a programmable display scroll time up to 15
seconds.
(ii) Manual operating mode
The push button/switch on the panel shall be used to start the display sequence
and to display the various stored data.

The register unit shall display at least the following real time data:
(i) Current date/time

(ii) Maximum kW demand rate (Max 4 rates)
(iii) Maximum kVar demand rate (Max 4 rates)
(iv) Cumulative kW demand rate (Max 4 rates)
(v) Cumulative kVar demand rate (Max 4 rates)
(vi) Total kWh
(vii) kWh rate(Max 4 rates)
(viii) Total kVarh
(ix) kVarh rate (Max 4 rates)
(x) Per phase voltage and current (Instantaneous)
(xi) Per phase power factor or phase angle (Instantaneous)
(xii) System kW, kVar, and kVA (Instantaneous)
(xiii) System power factor or phase angle (Instantaneous)
The display sequence and identified code can be independently specified by the user
(programmable). The identified code shall be at least three (3) digits.
The display shall have symbols for indicating the operation of the meter, and also
both import and export direction of measured active and reactive energy.
The display shall be able to indicate a unit of measure and the symbol of Electricity
Rates.
5.7 FUNCTION FOR CHECKING
The meter shall be able to indicate defects, by displaying on LCD display, as follows:
a) In case the meter is damaged or has internal defects (e.g. clock fail, memory fail,
etc.).
b) In case the meter measures in reverse direction, or energy flows in reverse
direction.
c) In case the voltage at any phase is lost or under the setting value.
d) In case of low battery
5.8 REAL TIME CLOCK AND CALENDAR
The meter shall have an internal real time clock and/or a crystal-controlled time clock,
supplied from the Lithium back-up battery in case of power supply failure, for
providing calendar functions (i.e. the time of day, date, weekday, weekend, holiday,
year). The Lithium back-up battery shall be socket type.
5.9 POWER SUPPLY
The auxiliary power supply for the meter shall be derived from PT & CT.
5.10 LOAD PROFILE FUNCTION
The meter shall be able to record load profile data of no less than two (2) channels,
kW and kVar demand, every 15 minutes for at least 40 days in each channel. Load
profile data shall not be effected when the power is lost.

5.11 SECURITY SYSTEM
The meter shall have a sophisticated security system to prevent fraudulent

interference i.e. changing the tariff data or changing the meter reading.
The meter shall have at least three (3) following groups of accessible password:
i. Group 1: Password for administrators to write the software and set the system
of the meter.
ii. Group 2: Password for programmers to program the operating functions of the
meter
iii. Group 3: Password for readers to read the stored data, including to correct the
time of the meter
5.12 COMMUNICATION SYSTEM
Each meter shall have at least two (2) following communication systems:
i. Optical port, easily accessed through the front of the meter cover, for data
retrieval and program of all major operating characteristics of the meter.
ii. RS485 for connecting with modem.
5.13 CT Ratios
Meters should have dual CT ratio of 1/5 Amps. The change in the CT ratio can be
made only through a software and password authentications.
5.14 Tests and test reports
The meter shall pass the manufacturer’s standard routine tests. The following type
tests shall be in accordance with the latest relevant IEC or ANSI:
 Test of insulation properties:
- impulse voltage test
- A.C. voltage test
 Influence of short-time over currents
 Influence of heating:
- windings, if any
- external surface
 Electromagnetic compatibility (E.M.C.):
- radio interference measurement
- fast transient/burst test
- immunity to electromagnetic HF field test
- immunity to electrostatic discharge test
 Others according to manufacturer’s standard
 Heating (permissible temperature rise) of:
- windings, if any, in K
- external surface in K
The acceptance inspection shall be according to the latest relevant IEC or ANSI

6.0 Power and Control Cables
6.1 Applicable Standards : IEC: 60183, 60227, 60502, 60885

BS: 6500/IS 1554, 7098
6.2 Parameters
a) Rated voltage
i. HV cables : 33 kV/ 11 kV
ii. LV power and control cables : 1.1 kV
iii. Lighting wires in conduits : 300/ 500 V
b) Installation:
i. In air or buried in ground.
ii. Depth of laying in ground for directly buried 33 kV cables:
1050 mm and 11 kV cables: 900 mm & for LV cables:
750 mm
iii. In conduit: space factor not more than 40 %.
iv. In trays: single layer, touching.
c) Conductor Material : Aluminium for HV & LV power cables

of greater than 10 mm2. Copper for all
control cables, DC cables, and lighting
wires.
d) Insulation : XLPE (for HV/MV/LV, control cables

and lighting wires)
e) Outer Sheath : Extruded FRLS (for Control cables)
f) Inner sheath : Extruded
g) Multi core cables : Control cables shall be as per the BOQ

and site requirements. All CT cables
shall be 4C x 2.5 sq. mm and PT cables
shall be 2.5 sq.mm. Cables connecting
to battery shall be single core types.
Other DC supply cables shall be either
2C x 2.5 sq. cable or part of bigger size
cables.
h) Armouring : Galvanised steel (Aluminium for single

core)
6.3 MV/LV Cables
a) 33 and 11 kV cables - 33 kV, 3 C x 300/185 sq.mm and

11 kV, 3C x 300 sq.mm. XLPE,
Aluminium, earthed grade
cable.(As per the BOQ).
b) LV cables - 1.1 kV grade, 4 C, XLPE,
Aluminium, earthed grade cable,
Rating as per BOQ and if the same

is not adequate it shall be decided
during detail engineering.
c) 11 kV Indoor - 11 kV, 3CX300 XLPE,
Switchgear to 11 kV Aluminium, earthed grade cable
Take-off Structure
d) 33 kV Indoor 33 kV, 3C(As per BoQ) x 300/185
Switchgear to 33 / 11 sq. mm., XLPE, aluminium,
kV transformer earthed grade
terminal box
e) 33 kV Indoor 33 kV 3C(As per BoQ) x 185/300
Switchgear to 33 kV sq. mm, XLPE, aluminium,
Take-off Structure earthed grade
The above sizes are tentative and shall be decided during detail engineering.
6.4 The cable lengths indicated in price schedule shall be considered for
evaluation. However, it is Contractor's responsibility to provide the cable
schedule based on unit rates furnished during bidding. The contractor is to
procure the cables/cable termination only after finalizing the cable
schedule and not based on the BOQ in order to minimize the stores and
spares.
6.5 LT and DC cables shall be sized taking into consideration maximum voltage
drop of 2%.
6.6 33 and 11 kV cables shall be supplied in steel drums. The contractor may take
back the steel drum after completion of the works.
6.7 Tests
6.7.1 Cables shall be subjected to routine tests as per the applicable standards.
6.8 Cable Trays and Carrier System
6.8.1 Cable Trays supports
Cable tray supports such as angles, channel, etc shall be of GI/MS type.
6.8.2 Cable Trays
6.8.2.1 For power cables, cable trays of MS ladder type shall be used. Accessories
such as tees, elbows, reducer, etc. shall be fabricated out of minimum 2 mm
thick sheet of hot dip galvanised type. Cable tray supports shall be at 1000
mm interval. If at the time of execution it is found that the cable trays sag, it is
Contractor’s responsibility to provide additional supports at no extra cost.
6.8.2.2 For Instrumentation and control cables, perforated type Aluminium cable trays
of minimum 5 mm thick sheet of hot dip galvanised type shall be used. The
outdoor cable trays if exposed to sun also shall be covered with the cover.

6.9 Power and Control Cable Terminations
6.9.1 Terminals for power connections shall be complete with adequate phase
segregating insulating barriers, shrouds and suitable crimping type of lugs for
terminating the cables.
6.9.2 Double compression type glands with armour and bonding clamps for the
termination of all solid dielectric shall be provided. They shall be designed to
secure the armour wires to provide electrical continuity between the armour
and the threaded fixing component of the gland and to provide watertight seals
between the cable outer sheath and gland and between the inner sheath and
threaded fixing component. The gland shall preferably project above the gland
plate to avoid entry of moisture.
6.9.3 Earthing connectors between cable armour and earth shall be routed outside
the cable gland in an approved manner. Gland insulation shall be capable of
withstanding test for appropriate high voltage for one minute.
6.9.4 Cable terminations and jointing for HV/LV cables shall be carried out with
heat shrinkable type termination kits. Adequately sized shrouds/bolts shall be
provided at connections to completely cover the terminations.

7 - MISCELLANEOUS ITEMS
7.1 Lighting System
7.1.1 Applicable Standards: IEC 60083, 60598, 60669, 60884, 60906 and
60947/IS1913
7.1.2 General Requirements
7.1.2.1 Lighting system equipment shall cover lighting panel, lighting fixtures,
switches, receptacles with switches, outdoor lighting inclusive of outdoor
lighting masts, street lighting poles, etc.
7.1.2.2 Normal and emergency lighting for indoor and outdoor areas shall be
provided. Separate lighting panels shall be provided for indoor and outdoor
areas.
7.1.2.3 Emergency supply shall be derived from 110V DC distribution board to be

provided under this contract. Or a separate inverter shall be provided for
emergency lighting.
7.1.2.4 Each lighting panel shall have facility for feeding the circuits, which would
operate on emergency supply.
7.1.3 Lighting Panels
7.1.3.1 Lighting panels shall be of wall/floor mounting type and fabricated out of 1.6
mm thick cold rolled sheet steel. Incomer circuit shall be controlled by a load
break type, triple pole switch or an MCB with a link in the neutral circuit.
Outgoing circuits shall be controlled by single pole MCBs of minimum 6A for
light points and 16 A for power points. Breaking capacity of MCBs shall not
be less than 10 kA. Residual current circuit breakers shall be provided on all
lighting and receptacle circuits.
7.1.3.2 The incomer circuit shall have bottom cable entry. It shall be possible to take
out outgoing circuits from top and bottom. Knockout for cable/conduit entries
for all the outgoing circuits shall be provided. Separate circuit for control of
lighting fixtures and receptacle shall be provided. Each phase shall have at-
least one spare circuit.
7.1.3.3 The panel shall be provided with 3 phase and neutral copper busbar adequately
rated to cater to the requirement of all the outgoing circuits. Two earthing
terminals shall be provided external to the panels for terminating the external
earthing conductor.
7.1.3.4 The panel shall be internally wired using colour coded, stranded copper
conductor, PVC insulated wires of 1100 V grade 2 nos. voltage relays suitable
for connection on 240 V, 1 phase power supply and one contactor suitable for
operation on 110 V DC shall be incorporated for sensing failure of AC supply
and energizing emergency lighting circuit.
7.1.3.4 Day timers shall be provided for automatic switching off outdoor lighting.

7.1.3.5 The panels shall have hinged door, gasketed all round and provided with
handle lock. Operation of incomer switch or MCBs shall be possible without
opening the door.
7.1.4 Lighting fixtures and its accessories
7.1.4.1 Lighting fixtures for illumination of outdoor and indoor area shal1 be
supplied. Fixtures for outdoor/semi-outdoor installation shall be of
weatherproof design with degree of protection of at least IP67.
7.1.4.2 Fixtures shall be complete with internal wiring, lamp, power factor correcting
capacitors, starter, holder, ballast, reflector, louvres/perspex, etc. as required
for their satisfactory operation.
7.1.4.3 Following types of fixtures shall be considered for various areas:
a) General purpose flood lighting fixtures - Housing from die-cast

aluminium alloy, vitreous enameled, and with electrochemically
brightened anodized aluminium reflector, a clear heat resistant glass,
with rubber gasket, secured to housing by aluminium ring, cast iron
base and MS cradle for turning in horizontal and vertical planes and
lockable in desired position, suitable for 80 W LED lamp with control
gear. These fixtures shall be used for illumination of outdoor
substation equipment and for providing general illumination. These
fixtures shall have asymmetrical light distribution and shall be
mounted on gantry structures.
b) Gate post lights - Top canopy spun from aluminium sheet and vitreous
enameled. Aluminium fins shall be fixed on the canopy at top and
spigot at bottom. Spigot shal1 be made of die-cast aluminium and
vitreous enameled. Fixture shall be suitable for 45 W LED lamp.
c) Decorative type LED fixtures - Housing made from mild steel sheet
and stove enameled white. Reflector assembly made from
electrochemically brightened anodized aluminium sheets secured to
housing with spring loaded triggers and suitable for 2 nos. 36 watt .
These fixtures shall be used in switchgear room and other areas where
false ceiling is provided. Fixtures shall be suitable for recessed
mounting in false ceiling.
d) Decorative type LED fixtures of the enclosed type - Tube mounting

channel made from mild steel sheet and stove enamelled white.
Diffusers made from opal acrylic sheet and suitable for 1 or 2 nos. 36
W. These fixtures shall be provided in areas without false ceiling and
suitable for surface mounting.
e) Corrosion resistant type lighting fixtures suitable for 2 nos. 36-watt

LED shall be provided in battery room.
f) Well glass type fixtures - Housing made from die-cast aluminium

alloy, vitreous enamelled, grey hammer tone outside and white inside.

A clear screw type neck fixed on housing and sealed with gasket.
Fixture provided with mild steel zinc coated wire guard and suitable
for 50 W LED lamp. These fixtures shall be used on emergency circuit
and located near each main transformer marshalling box.
g) Decorative fixtures with glass/perspex covers suitable for emergency

lighting in control room and battery room. Fixtures shall be suitable
for recessed mounting in false ceiling wherever the latter is provided.
h) Street lighting fixtures for the approach road shall be weatherproof,

suitable for 80 W LED lamp and shall be cut-off type. The fixtures
shall be of die-cast aluminium with electrochemically brightened
anodised aluminium reflector and with transparent polycarbonate
cover.
i) Types of fixtures proposed by the Contractor for various areas shall be

subject to Engineer's approval.
7.1.4.4 The capacitor in the lighting fixture shall have adequate value of capacitance
to correct the power factor to 0.95 lag.
7.1.4.5 Each fixture shall be complete with a four way terminal block for connection
and looping of incoming and outgoing cables. Each terminal shall be able to
accept two 2.5 sq. mm stranded copper conductors.
7.1.4.6 Each lighting fixture shall be provided with an earthing terminal suitable for
connecting 16 SWG stranded copper conductor.
7.1.5 Illumination levels
7.1.5.1 Lighting system shall be installed to achieve the average maintained levels of
illumination as indicated below. The Contractor shall be required to measure
the actual levels and carry out necessary modifications to accomplish specified
levels. It is to be noted that the values measured after installation will exceed
those specified by a factor that is equal or greater than the reciprocal of
maintenance factor. Measurement shall be carried out after 100 burning
hours.
a) Control room, Switch gear room, etc. : 400 lux

b) Passage, toilet, battery room,
store, etc. : 150 lux
c) Outdoor substation equipment
and outdoor areas : 30 lux
d) Internal Roads : 20 lux
7.1.5.2 The illumination system shall be so that the uniformity factor is of acceptable
level and that the glare is within limits. The ratio of maximum to minimum
illumination levels shall not exceed 20 in outdoor area within the fence.
7.1.5.3 The following values of maintenance factors shall be considered for design:
a) Outdoor area : 0.6

b) Indoor air-conditioned area : 0.8
c) Other indoor areas : 0.7
7.1.5.4 The Contractor shall furnish detailed design calculations along with a contour
map of illumination levels for outdoor area and control room, uniformity
factors, ratio of maximum to minimum illumination levels, ratio of average to
minimum illumination levels, glare indices, etc. for approval. Detailed
characteristics of various types of fixtures including but not limited to,
illumination curves and tables shall also be furnished for review during detail
engineering.
7.1.6 Receptacles with switches
7.1.6.1 Receptacles of 5A and 15A rating with switches suitable for operation on 240
V AC, 1 phase, 50 Hz supply shall be provided as detailed below:
a) Decorative and industria1 type shall be proposed in relevant areas.

b) Receptacles proposed for outdoor/semi-outdoor installation shall be of
weatherproof design with degree of protection IP 67.
c) Receptacle shall be housed in galvanised steel boxes.
7.1.6.2 Fo1lowing quantities of receptacles shall be considered
a) Control room cum switchgear room :

2 nos. 5A and 3 nos. 15A industrial type.
b) Near each transformer :
1 no. each 15A industrial, weather-proof type
7.1.7 Switches
7.1.7.1 Decorative/ industrial type switches of 5A/10A rating shall be provided for all
indoor areas. Switches shall be provided to control a group of lighting fixtures
in various areas. Switches shall be housed in galvanized steel boxes.
7.1.7.2 Scope of Lighting system for various areas:

a) Indoor lighting system for the respective rooms and outdoor flood
lighting for roads, transformer and entrance.
7.1.8 Tests
7.1.8.1 Lighting panels, fixtures, receptacles and other accessories shall be subjected
to routine and acceptance tests as per the applicable standards.
7.2 Earthing Protection System
7.2.1 Applicable Standards : ANSI/IEEE Std. 80 & 142

IEC 61024, IS:2303,
IS:3043, IS:2309

7.2.2 Requirements
7.2.2.1 Following material and sizes of earthing conductors, electrodes and shield
wire shall be used for various purposes:
a) Main earthing grid (buried in ground) - 50 x 6 mm MS

b) Earthing leads for outdoor substation equipment - 50 x 6 mm MS
(below ground) and 50 x 6 mm GS (above ground)
c) Earth electrode - 40 mm dia, 3000 mm long, heavy gauge MS/GI pipe
d) Distribution boards, control and relay panels, lighting panels, battery
chargers, etc. - 25 x 3 mm GS
e) Lightning shield wire - 7/3.35 mm stranded GS wire
f) 16 SWG copper wire for lighting fixtures, metallic conduits,
switch/receptacle boxes, etc.
7.3 33/ 11 kV Structure
7.3.1 33 and 11 kV Incoming and outgoings from the 33/11 kV switchgear shall be
by 33/11 kV grade earthed cables. The cables shall be terminated on a take-
off structure.
7.4 Insulators and Hardware
7.4.1 Applicable Standards: IEC 120, IEC 305, IEC 372, IEC 383, IEC 575,
IEC 1109, ANSI C29.6, and ANSI C29.4
7.4.2 Pin Insulators
a) Pin insulators shall be manufactured to IEC 383.1 and ANSI C29.6,

Class 56.2 and Class 56.4. The insulators shall have necks suitable for
fastening conductors with tie wire or preformed fitting. Conductor sizes
up to 200 mm2 ACSR will be used.
b) Pin insulator shall have the following minimum characteristics.

CHARACTERISTICS UNIT 33 kV 11 kV
Designation (ANSI C29.6) Class 56.2 Class 56.2

Cantilever strength kN 10.7 10.7
Nominal diameter mm 305 229
Nominal height mm 241 165
Nominal creepage distance mm 25 mm/kV 25 mm/kV
Puncture voltage kV 180 105
Minimum power frequency
flashover voltage
dry kV 140 110
wet kV 95 70
c) Each pin insulator shall be supplied complete with a hot dip galvanised
forged steel pin, complete with nut, lock nut and spring washer. The
ultimate mechanical strength of the pin insulator assembly shall be equal
to the above cantilever strength. Pin insulators shall be supplied with
pins to fit on crossarms.
7.4.3 String Insulators
a) The string (tension disc) insulators shall be the ball and socket type
conforming to IEC 305 and IEC 120.
b) Each disc of the string insulators shall have the following minimum
characteristics.
CHARACTERISTICS UNIT
Designation (IEC 305) U 80 BL
Mechanical failing load kN 70
Nominal diameter mm 255
Nominal spacing mm 145
Nominal creepage distance mm 25 mm/kV
Puncture voltage kV 105
145
Minimum power frequency flashover
voltage Dry kV 78
Wet kV 45
c) Each string assembly shall consist of one (for 11 kV) or three (3 nos. for
33 kV) tension disc insulators, ball and socket couplings (16 mm to IEC
120), and a deadend clevis thimble suitable for preformed terminations
of 150 mm2 or 100 mm2 or 50 mm2, ACSR conductors.
d) String insulator assemblies shall be supplied each complete with

crossarm straps, clamp ball, insulator(s), deadend clevis thimble,
necessary GI bolts, nuts, flat and spring washers to fit on crossarms.
7.4.4 Miscellaneous Clamps/Connectors/Lugs
a) Miscellaneous clamps/connectors and lugs shall be to suit above sizes of

earthing rod/pipe/conductor. Clamps and connectors shall have bolted
connections with 2 nos. bolts.
b) Suitable bimetallic clamps shall be provided for connecting 1Cx6 sq.
mm copper conductor to GI spike earthing rod.
7.6 Tests
7.6.1 Certificates of type tests carried out on arresters, insulators and hardware of
similar type shall be furnished during detail engineering.
7.6.2 Routine tests and acceptance tests as per the applicable standards shall be
carried out on the arrester, insulators and hardware in the presence of
Employer's representative.

7.7 Ventilation System
Suitable ventilation system shall be provided for switchgear room as required.

The ventilation system shall consist of propeller exhaust fans with weather
proof louver. Minimum 15 changes/hour shall be considered for ventilation of
each room.
7.8 Fire Fighting System
Portable fire extinguishers of CO2 (3-kg capacity), bearing ISI/UL/other

international standards marking shall be installed in the substation building.
Sand buckets properly painted with red colour and associated mounting
structure shall be provided near the entrances and 5MVA transformer.
7.9 Rubber Mats
1 m (l) x 0.75 m (w) x 0.003 m (t) rubber mat of black colour shall be installed
in front of each ACDB, DCDB and 33 kV and 11 kV switchgear.

SECTION VI - C – TECHNICAL SPECIFICATION (CIVIL)
1.0 General
1.1 This specification covers the general requirements with supply of all materials and
construction of civil related works and fabrication of structural steel works.
1.2 The contractor shall perform the works to meet the requirements of this
specification, the attached bid drawings and the relevant articles of this Contract
Document.
2.0 Standards & Applicable Codes
2.1 All materials, design, fabrication, galvanising and tests under these specifications
shall conform to the latest applicable Indian Standards, codes or their equivalent
established and approved in the country of manufacturer, and approved as equal by
Engineer.
2.2 Any details not specifically covered by these standards and specifications shall be
subjected to approval by Engineer. In the event of contradictory requirements
between the standards and the specifications requirements, the terms of the
specifications shall apply.
2.3 The Contractor may propose equivalent standards, specifications, materials etc.
which shall be equal in every aspect as specified. If the Contractor for any reason
proposes equivalents to or deviations from the above standards, he shall state the
exact nature of the change or the reason for making the change and shall submit
complete specifications of the materials as well as copies of pertinent standards for
the approval of Engineer and decision of Engineer in the matter of acceptability
will be the final.
3.0 Materials
All materials shall be as per the specifications and shall be approved by the
Engineer before use in the works. Samples of materials, fittings etc. shall be
submitted by the contractor for approval of the Engineer before bulk supplies are
brought on the site of works. The samples so approved shall be kept in the custody
of Engineer till the completion of works. When required by the Engineer, the
contractor shall supply for the purpose of testing, samples of any materials
proposed to be used in the works.
4.0 Testing of materials
Samples whether submitted to govern bulk supplies or required for testing before
use shall be tested and the testing charges, if any, shall be borne by the contractor.
Testing of materials like concrete, brick, sand, aggregates, reinforcement and any
other civil materials may be done as and when instructed by the engineer. Any
materials failing from the test will be not allowed to use at site

DHI Group – Standard Bidding Document for Works
5.0 Safety on works
Safety precautions pertaining to construction works such as excavation trenching,

blasting, demolition, provision of scaffolds, ladder, working platforms, gang ways,
mixing of asphalt materials, electric aarc
rc and gas welding, use of hoisting and
construction machinery shall be taken care by the contractor.
6.0 Antiquities and useful materials
Any finds at the time of excavation such as relics of antiquity, coins, fossils or
other articles of value shall be delivered by the contractor to the Engineer and shall
be the property of the Government. Any materials obtained from the excavation
which in the opinion of the engineer is useful, shall be stacked separately in regular
stacks as directed by the engineer aand
nd shall be the property of the Government.
7.0 Bench marks
Temporary site bench mark shall be constructed at the construction site, where so
required by the Engineer.
8.0 Quality of Materials and Workmanship
The materials and workmanship shall be of the the best of their respective kinds and
shall be to the approval of the Employer or his representative on Site, the Engineer.
The contractor shall carry out modifications in the procedure of work, if found
necessary, as directed by the Engineer during inspection.
inspection. Substandard quality of
work shall be rectified/redone at the contractor’s own cost, and defective
work/material shall also be removed from the site of works by the contractor at his
own cost.
The Engineer may ask to carry out the field/Laboratory tests mentioned in the
specification and the cost of carrying out such tests which include equipment
charges, tools, materials, labour and incidentals to perform tests and other
operations of quality control according to the specification requirements shall
sha be
deemed to be incidental to the work and no extra payment shall be made for the
same. Sampling and testing procedure to be used shall be as approved by the
Engineer and his decision shall be final and binding on the contractor.
9.0 Equivalency of Standards

ndards and Codes
Wherever reference is made in the Contract to specific standards and codes to be

met by the goods and materials to be furnished and work performed or tested, the
provisions of the latest current edition or revision of the relevant standards
standar and
codes in effect shall apply, unless otherwise expressly stated in the Contract. In
case of any differences between the standards specified and the proposed
alternative standards shall be fully described in writing by the Contractor and
submitted to the Engineer at least 28 days prior to the date when the Contractor
desires the Engineer’s consent. In the event of the Engineer determines that such
proposed deviations do not ensure substantially equal or higher quality, the
Contractor shall comply with the standards specified in the documents.
51
No materials of any description shall be used without prior approval by the

Engineer and any condemned as unfit for use in the works, shall be removed
immediately from the site by, and without recommendation to, tthe
he Contractor.
If these specifications do not cover these items then the relevant IS codes shall be
applicable. Where no reference is found in the above specifications for an item of
work then sound engineering practice as decided by the Engineer shall be
applicable and the decision of the Engineer in respect to all such matters relating to
specifications shall be final and binding on the contractor.
10.0 Signboards
The Contractor shall erect signboards in prominent positions adjacent to the works
to the satisfaction of the Engineer/in line with the requirement of CDB.
11.0 Environmental Management Plan
The Contractor’s shall submit an Environmental Management Plan, where the

Contractor explains how the site shall be organized, how the contractor shall
proceed with the works, and how the activities shall be executed to comply fully
with the rules explained in the Bhutanese Environmental Codes of Practice.
12.0 Location of Camp
The contractor shall locate the Contractor Camp away from settlements, drinking
drink
water supply intakes, landslides or flood prone areas. This will help to avoid social
conflicts and the pollution of such sites and unsanitary waste disposal.
13.0 Scope of Works
The scope of works for civil works, architectural, structural and foundations
ndations shall
include preparation of ground, supply of all materials to site including insurance
and storage, provision of all labor, qualified supervisory personnel, instruments,
tools, erection of plant and equipment, fixtures, fittings and all temporar
temporary and
permanent works necessary, whether or not such items are specifically stated
herein for satisfactory completion of the job in all respects in accordance with the
specification or as mentioned in the BoQ.
14.0 Grading & Leveling of Area
Site be graded
ed to the required level by cutting & filling. In case of filling, the
excess depth be brought to the required level by using cement concrete of M-10M
Grade. Area shall also be cleared of Jungle, bushes, vegetation, trees including its
roots etc. and stacking
ng of serviceable materials and disposal of other material as
directed by engineer. Filling in the excavated areas shall be done with sand.
15.0 Excavation
15.1 Earthwork in excavation for various foundations can be carried in all types of soil
including
ng soft/fissured/hard rock. The work shall also include dewatering in case
52
confronted in any area. The scope of work also covers disposal of surplus
excavated material after filling back of foundation.
15.2 Excavation shall conform to the dimensions and eelevations

levations as shown on the
approved drawings. When foundations rest on an excavated surface other than
rock, special care shall be taken not to disturb the bottom of excavation. When
subsoil for foundation becomes murky on top due to construction operation or any
other reason, such subsoil shall be removed and replaced by one or more layers of
compacted send or crushed rock as directed by Engineer.
15.3 If any drainage system exists in the vicinity of excavation, Contractor shall control
the grading in the vicinity of all excavations so that the surface of the ground will
be properly sloped to prevent surface water from running into the excavated areas
during construction.
15.4 When machines are used for excavation, the last 300 mm before reaching the
required
red level shall be excavated by hand or by such equipment that shall leave the
soil at the required final level in its natural condition.
15.5 When excavation requires shoring, bracing etc. contractor shall submit to engineer
drawing g showing arrangement and details of proposed installations and shall
proceed only after getting approval from Engineer.
15.6 Excavated material suitable for use as backfill shall be deposited by contractor in
storage piles at the area approved by Engineer. However, surplus aand/or
nd/or unsuitable
excavated materials shall be hauled and transported to the disposal area designated
by Engineer.
16.0 Backfill
16.1 Contractor shall place and compact the backfill materials to the lines, grade and
dimension shown on approved drawings.
16.2 Prior to backfilling, all forms, temporary shoring, timber etc. shall be removed and
clean all trash, debris, perishable/organic materials and shall be approved by
engineer. The material to be used for backfill, the amount thereof and the manner
of depositing
epositing the materials shall be approved by Engineer.
17.0 Cement
It shall be of approved brand

brand.. Cement shall be stored and stacked in bags in dry
and water proof sheds. Cement bags shall not be stacked more than 10 bags high to
avoid lumping under prespressure.
sure. When removing cement bags for use apply the "first
in, first out", rule, that is, take the oldest cement out first. Each consignment of
cement shall be stacked separately therein to permit easy access for inspection and
facilitate removal. Storage of cement at the site of work shall be at contractor's
expense and risk. In the event of any damage occurring to cement due to faulty
storage in contractor's sheds or on account of negligence on his part such damages
shall be the liability of the contractor.
53
18.0 Plain Cement Concrete (PCC)
100 mm thick M-1010 grade be provided underneath the structural concrete/masonry

as mud-mat.
mat. Concrete shall be always mixed by mechanical mixer unless otherwise
the Engineer permits hand mixing.
19.0 Reinforced Cement Concrete (RCC)
All RCC shall be of M-20

M 20 grade concrete as per approved design and drawings.
Concrete shall be always mixed by mechanical mixer unless otherwise the
Engineer permits hand mixing.
20.0 Damp Proof Course (DPC)
DPC shall be M-1515 grade of minimum

minimum thickness 50 mm with water proofing
compound in ratio as recommended by manufacturer and thereafter applying a Hot
Coat of bitumen.
21.0 Stone Masonry Work
All stones shall be wetted before use. Masonry shall be laid truly in plumb or to
required batter where so specified. Height of construction in a day shall not exceed
1m so as to avoid excess load on fresh mortar.
22.0 Plaster
The joints shall be raked out properly. Dust and loose mortar shall be brushed out.
Efflorescence if any shall be rem
removed
oved by brushing and scraping. The surface shall
then be thoroughly washed with water, cleaned and kept wet before plastering is
commenced. In case of concrete surface, if a chemical retarder has been applied to
the formwork, the surface shall be roughened by wire brushing and all the resulting
dust and loose particles cleaned off and care shall be taken that none of the retarder
is left on the surface. The joints of masonry shall be raked out properly so that the
plaster is well keyed with the masonry.
23.0 Water
Water used for mixing mortars and concrete shall be clean and reasonably free
from injurious quantities of deleterious such as oil, acids, alkalis, salts and
vegetable growth. Generally portable/drinkable water shall be used. Water found
satisfactory
tory for mixing is suitable for curing concrete. However, the water used for
curing should not produce any objectionable stain or deposit on the concrete
surface.
24.0 Stone boulder
Stone shall be hard, sound, free from decay, weathering and defects like
lik cavities,
cracks flaws, sand holes, veins patches of soft or loose materials etc. It shall be
54
obtained from an approved quarry. Where required by the Engineer the stone shall
be got tested for water absorption determined as per IS: 1124, the stone boulders
boulde
shall not have round surfaces. The stone using for RRM works should be in blocks
of size 150 x 150 x 900 mm unless directed otherwise by Engineer or stated.
25.0 Stone aggregates
These shall be crushed or broken from hard stones. It shall be hard, strong, dense
and durable, clean and free from soft, friable, thin, flat, elongated or laminated,
flaky pieces and shall be roughly cubical in shape. While stock piling, the
aggregates shall not form pyramids resulting in segregation of different sized
materials and
nd height shall not exceed 1.5 m. The tests must be carried out for the
stone aggregates to check their conformance to the requirements of the
specifications.
26.0 Gravel or shingle
Gravel/Shingle can be from the river beds or pits. It shall be sound, hard, clean,
suitably graded in size as specified without broken fragments. It shall be free from
flat particles of shale, powdered clay, silt, loam and other impurities. However, pit
gravel shall have to be washed.
27.0 Sand
Not more than 10% shall be retained on 4.75 mm IS Sieve. The sum of the
percentage of all deleterious materials shall not exceed 5%. It shall not contain
harmful organic impurities in any form or quantities which will adversely affect the
strength and durability of concrete or mortar. It shall not contain any acidic
material, which is likely to attack steel reinforcement. The tests must be carried out
for the fine aggregates to check their conformance to the requirements of the
specifications. The fineness modulus of sand to be used in plaster sshall
hall be between
1.0 and 1.5. The fineness modulus of sand to be used in concrete and for mortar
required for masonry shall be between 2.0 and 3.1. The maximum quantity of silt
shall not exceed 8%. Quantity passing through 150 microns IS Sieve shall not be
more than 10%.
28.0 Bricks
The bricks shall be hand or machine moulded. They shall be free from cracks and
flaws and nodules of free lime. The tests must be carried out for the brick to check
their conformance to the requirements of the specifications.
Bricks
cks required for brick work in cement mortar shall be adequately soaked in
stacks, before use, by profusely spraying with clean water at regular intervals for a
period of not less than six hours so as to keep them wet to the satisfaction of the
Engineer. Bricks
ricks required for masonry with mud mortar need not be soaked.
Brickwork shall be laid in English bond unless otherwise specified. Half or cut
bricks shall not be used except where necessary to complete the bond. Closures, in
such cases, shall be cut to the
the required size and used near the ends of the walls.
55
In exposed brickwork, selected bricks shall be used for the face work.
29.0 Water Proofing Compound
It shall be of approved brand. The material shall not contain any harmful
constituents, which are llikely
ikely to impair the strength of cement. It shall conform to
the specification of IS 2645.
30.0 Concrete Admixtures
These shall conform to IS: 9103. Admixture is a material other than water,
aggregate, and hydraulic cement and additives like pozzolana or slag and fibre
reinforcement used as an ingredient of concrete or mortar and added to the batch
immediately before or during its mixing to modify one or more of the properties of
concrete in the plastic or hardened state. The different types of admixture are as
follows:
a) Accelerating admixtures,
b) Retarding admixtures
c) Water-reducing
reducing admixtures
d) Air entraining admixtures, and
e) Superplasticizing admixtures.
The chloride content in the admixture shall be declared by the manufacturer. Super
plasticizers
asticizers are expected to be chloride free. Admixtures that contain relatively
large amounts of chloride may accelerate corrosion of prestressing steel. Where
corrosion of such steel is of major concern, compliance with requirement of the
specification of IS 9103 does not constitute assurance of acceptability of the
admixture for use in prestressed concrete. In case of reinforced concrete, to
minimize the chances of deterioration of concrete, the total chloride content in the
concrete should be limited as specified in IS 456: 2000.
31.0 Final cleaning
Protective coating and warnings shall remain undisturbed until final acceptance,
immediately prior to final inspection, temporary protection covering or coating
shall be removed and surfaces shall be washed with a suitable thinner and left in a
finished condition having approved uniform appearance and free from all marks
and blemishes. Wash and polish glass on both faxes.
32.0 MS Angle, Tee, Channels, Flats/Plates/ Anchor Plates
All finished steel shall be well and cleanly rolled to the dimensions and weight
specified subject to permissible tolerances as per IS 1852. The finished material
shall be reasonably free from cracks, surface flaws, laminations, rough and
imperfect edges, and all other harmful defects.
defects. Steel sections, shall be free from
excessive rust, scaling and pitting and shall be well protected. The decision of the
Engineer regarding acceptability of the any steel section shall be final and binding
on the contractor. The mechanical and chemical pproperties
roperties of the structural steel
shall be as per Tables 3.6 and 3.7 respectively. The following varieties of steel
shall be used for structural purposes: -
56
a) S.T. 42-S: - The standard quality steel designated as S.T.42

S.T.42-S,
S, conforming to IS:
226 shall be used for all the types of structure (riveted or bolted) including these
subject to dynamic loading and where fatigue, wide fluctuation of stresses, reversal
of stresses and great restraint are involved as for example crane gantry girders,
road and rail bridges
dges etc. It is also suitable for welded structures provided that the
thickness of materials does not exceed 20 mm.
b) S.T.42-W: - The fusion welding quality steel designated as S.T. 42-W, 42

conforming to IS: 2062; shall be used for structures subject to dy dynamic
namic loading
(Wind load is not to be considered as dynamic for this purpose) where welding
employed for fabrication and where fatigue, wide fluctuation of stress, reversal and
great restraint are involved as for example, crane gantry girders and road bridges.
brid
c) S.T.42-O: - The ordinary quality steel designated as S.T. 42

42-O,
O, conforming to
IS: 1977 shall be used for structures not subjected to dynamic loading other than
wind loads where welding is not employed or/and structures not situated in
earthquake zones
ones or/and design has not been based on plastic theory.
d) S.T.32-O: - The ordinary quality steel designated as S.T.32-

S.T.32 O, conforming to
IS: 1977 shall be used for doors, windows bars, grills, steel gates, hand railing,
builders hardware, fencing post, tie
t bars etc.
33.0 Other Requirements
The design details of foundations for the structures to be constructed by the

contractor shall be subjected to approval by Engineer.
Foundation construction works includes excavation in all types of soil and backfill,
back
shoring and pumping out water if required, conducting required tests, necessary
embedment, curing and everything required for the satisfactory completion of
works.
34.0 Concrete Works
Water, Cement, fine aggregate and coarse aggregate shall conform to material
specifications. Concrete can be specified by proportions or by nominating the
required strength.
Concrete shall be prepared by mixing graded stone aggregate or gravel of normal

size as specified with fine aggregate and cement in specified pro
proportions
portions with
required quantity of water.
35.0 Yard Fencing
This shall be as per the approved drawings.
57
36.0 Bar Bending Schedules
Before cutting and laying of the reinforcement for any RCC work, contractor need
to submit the bar bending schedules and get the approval from the Engineer in
charge. This shall be checked by the engineer at the site before implementing.
37.0 Daily Work/Monthly targeted Work Plan
Daily work plan need to be maintained at the site in proper register. The work plan
for next
xt day need to be discussed in the evening and need to follow as recorded.
Contractor need to submit the monthly targeted work plan to the Project Office for
the proper monitoring purposes.
38.0 Miscellaneous
i) The specification for the works which is not

not covered above shall be carried out
as per the specifications in the BSR and CPWD manual.
ii) The contractor and engineer shall carryout the joint measurements for all the
works executed by recording every 15 days and certified to have executed as
per drawing,
ng, design and specifications prior to release of on on-account
payments. Measurement shall be done as per actual and the unit will be as
mentioned in the BoQ recording to two places of decimal.
iii) Provisional quantities are those quantities which may be executed
execute as per site
requirements.
39.0 Dimension of Equipments
Contractors shall provide all dimensions of equipments and Engineer’s approval

shall be shown on the approved design drawings and shall conform to the
requirements described hereafter.
“No changes
es shall be made without the written approval of Engineer
Engineer”
40.0 Steel Structure
40.1 General Requirements
The scope covers detail design, preparation of design drawings, fabrication

drawing, fabrication, galvanising and erection of structural steel works wherever
necessary. All designs and drawings shall be subjected to approval of engineer.
Engineer shall have the right to instruct contractor to make any changes in design
and details necessary to make the construction conform to the Contract Documents.
Documen
40.2 Materials
Steel shall conform to IS: 226/IS: 2062 (tested quality) for mild steel and IS: 961
for high tensile steel.
58
All connection bolts, UU-bolts

bolts and nuts shall conform to IS; 6639. All washers
(spring washers, bevelled washers, flat washers
washers etc.) shall conform to IS: 2016/IS:
3063.
The minimum diameter of bolts shall be 16 mm. for members carrying calculated
stress and minimum 12 mm. for other members.
59
Section VI - D – Installation, Testing and Commissioning
1.0 GENERAL
1.1 The scope shall cover complete installation of plant items and accessories as indicated
in various parts of the specification. Requirements/ guidelines/ information/
parameters/ instructions etc. specified in this part shall apply to all the parts.
1.2 Installation work pertaining to plant items and systems such as cabling, lighting,
earthing and lightning protection systems, etc. shall comply with the applicable
standards, safety codes etc.
1.3 Installation shall be carried out strictly in accordance with the approved drawings.
Changes, modifications, if any, required to suit site conditions, shall be carried out
only with the prior approval of the Engineer. All such changes shall be incorporated
in the "As built" drawings to be furnished by the Contractor.
1.4 All tools, welding equipment, crane, scaffolding, rigging materials, ladders,
consumables, hardware etc. required for installation shall be provided by the
Contractor.
1.5 It shall be the responsibility of the Contractor to engage speciali

specialist
st engineers from his
Sub-contractors/Manufacturers
contractors/Manufacturers to supervise installation work for sub- sub-station items
such as transformers, switchgear and other substation equipment where felt essential.
Such services shall be arranged by the Contractor at no extra co
cost
st to the Employer.
1.6 It shall be the responsibility of the Contractor to obtain approval/clearance, if any,

from local statutory authorities, for conducting any work for completed installation.
1.7 The Contractor shall ensure that all substations under erecti
erection
on as well as the work area
and the project site are kept clean to the satisfaction of the Engineer. In case the
Engineer is not satisfied about the site cleanliness, he will have the right to carry
out the cleaning operations and expenditure incurred in this regard will be to
Contractor's account, which will be deducted from the bills bills.. Packing cases and
packing material, except for spares shall be cleared from sites.
1.8 In order to avoid hazards to personnel moving around the equipment such as
switchgear etc.
tc. which is kept charged after installation before commissioning, such
equipment shall be cordoned off by suitable barriers to prevent accidental injury.
1.9 Switchgear and control/relay panels shall be installed on finished surfaces or concrete
or steel sills.
ls. Proper aligning, joining of various vertical shipping sections, busbar
connections, inter panel wiring etc. will be the responsibility of Contractor.
1.10 The Contractor shall take utmost care in handling instruments, relays and other
delicate mechanisms. Wherever the instruments and relays are supplied separately,
they shall be installed only after erection of switchgear/ relay panels is complete.
60
2.0 CABLING SYSTEM
2.1 All apparatus, connections and cable work shall be designed and arranged to
minimisee risk of fire and any damage, which might be caused in the event of a
fire.
2.2 Cables shall be laid directly buried in earth, on cable trays in built-up
built trenches,
in conduits/pipes along walls/structures/foundations/ceilings, etc. The
Contractor's scope of work includes unloading, excavation, laying, backfilling,
fixing, bending and terminating the cables. The Contractor shall supply the
necessary material and accessories required for installation and termination of
the cables which shall include but not be limited to items such as glands, lugs,
terminating accessories, hardware, consumables, saddles/spacers, GI
conduits/pipes, cable identification tags, protective bricks, civil materials, etc.
2.3 Buried Cables
2.3.1 Cable installation in outdoor areas such as switchgear to A2 structure shall be

carried out in cable trenches/directly buried. Stabilized thermal backfilling
shall be used for directly buried cables. Cabling from trenches upto junction
box/equipment, etc. shall be carried out in GI conduit/
conduit/pipes.
pipes. Provision of GI
pipe sleeves in trench wall shall be the Contractor's responsibility. Where
cables cross roads or water/sewage pipes, the Contractor shall provide rows of
150 mm diameter GI pipes for passage of cables. Contractor shall also lay
spare
re pipes for future use. LV cables shall be buried at a depth of minimum
750 mm while HV & MV 11 kV cables shall be buried at a depth of minimum
900 mm and 33 kV cables shall be buried at a depth of 1050 mm. For road
crossings, the pipe for the cables shal
shalll be buried at not less than one metre
depth.
2.3.2 Directly buried cables shall be laid on a 75 mm thick sand bed. The cables
shall then be covered on top and at their side with sand to a depth of about 150
mm. This shall then be gently pulled down to a depth of about 100 mm above
the top of uppermost cable to provide bedding for the protective concrete cable
covers, which shall be placed centrally over the cables. The protective cable
covers shall be of reinforced concrete. The RCC covers shall have one hole at
each end to tie them to each other with GI wires to prevent displacement. The
trench should be then backfilled with the excavated soil after removal of
stones and boulders and well rammed in successive layers of not more than
300 mm thick, with the trenches being watered to improve consolidation,
wherever necessary. To allow for subsidence, a crown of earth not less than
50 mm in the center and tapering towards the sides of the trench should be
provided.
2.3.3 All cables to be routed along any particular route shall be laid at one time to
avoid repeated excavation, etc. Cable route markers shall be provided for
directly buried cables at an interval of 30 m and at every bend on the route in
the buried cable trench.
2.3.4 Where groups of HV, MV, LV and control cables are to be laid along the same
route, suitable metallic barriers to segregate them physically shall be
61
employed. When power cables are laid in the proximity of communication

cables, minimum horizontal and vertical separation of 300 mm shall be
maintained. Power and communication cables shall, as far as possible, cross
at right angles to each other.
2.4 Cables In Trays
2.4.1 Cables in trays shall be cleated individually or in a group using GI saddles.

Interval for cleating shall not exceed 1500 mm.
2.4.2 In case of laying on cable trays/racks, power and control cables shall be laid in
separate cable trays, the order of laying of various cables being as given
below:
a) HV cables on top tiers

b) LV cables on subsequent tiers
c) Control,
ntrol, instrumentation and other service cables in bottom-most
bottom cable
tier.
2.4.3 Ladder type GI cable trays and painted rack support shall be installed in cable
trenches for power cables. Perforated trays shall be used for control and
instrumentation cab
cables.
les. Embedded flats for fixing cable tray supports shall be
provided in cable trenches to support the cable trays during civil works.
Where such flats cannot be used, the fixing of cable trays shall be done using
anchor fasteners.
2.5 Cable Pulling
2.5.1 Standard cable grips and reels shall be utilised for cable pulling. If unduly
difficult pulling occurs, the Contractor shall check the pull required and
suspend pulling until further procedure has been approved by the Engineer's
Representative. The maximum
maximum pull tension shall not exceed the recommended
value for the cable measured by the tension dynamometer. In general, any
lubricant that does not injure the overall covering and does not set up
undesirable conditions of electrostatic stress or electros
electrostatic
tatic charge may be
used to assist in the pulling of insulated cables in conduit / pipes and ducts.
2.5.2 After pulling the cable, the Contractor shall record cable identification with
date pulled neatly with waterproof ink in linen tags/aluminum tag and shall
securely attach such identification tags. Identification tags shall be attached to
each end of each cable with non-corrosive
non corrosive wire. The wire must be nonnon-ferrous
material on single conductor power cable. Tags may further be required at
intervals on long
ng runs of cables on cable trays and in pull boxes. Cable and
joint markers and RCC warning covers shall be provided wherever required.
2.6 Each cable shall be pulled into the particular conduit/pipe. In hand holes, pull
boxes or junction boxes having any dimension over 1000 mm, all conductors
shall be cabled and / or racked in an approved manner. Care shall be taken to
avoid sharp bending or kinking cables, damaging insulation or stressing cable
beyond manufacturer's recommendations in pulling. Cable shall shall be protected
at all times from mechanical injury and from absorption of moisture at
62
unprotected ends. The bending radius for various types of cables shall not be
less than 15 times the overall diameter of the cable for armoured cables and 20
times the overall diameter of the cable for unarmoured cables.
2.7 Cables on cable racks and in conduits/pipes shall be formed to avoid bearing
against edges of trays, racks, conduit / pipes or their supports upon entering or
leaving racks or conduit/pipes.
2.8 Cables
ables splices shall not be used except where permitted by the Engineer's
Representative. Splices shall be made by Contractor for each type of wire or
cable in accordance with the instructions issued by cable manufacturers and
the Engineer's Representative.
Representative. Before splicing, insulated cables shall have
conductor insulation stepped and bound or penciled for recommended distance
back from splices to provide a long leakage path. After splicing, insulation
equal to that on the spliced conductors shall be appli
applied
ed at each splice.
2.9 At cable terminal points, where the conductor and cable insulation will be
terminated, terminations shall be made in a neat, skillful and approved manner
by specially trained staff. Terminations shall be made by the Contractor for
each type of wire or cable in accordance with instructions issued by cable
manufacturers and / or the Engineer's Representative.
2.10 Control cable termination shall be made in accordance with wiring diagrams,
using proper colour codes for the various con
control circuit.
2.11 When control cables are to be fanned out and corded together with a cord, the
Contractor shall make connections to terminal blocks, and test the equipment
for proper operation before cables are corded together. If there is any doubt
about
out correctness of connection, the Contractor shall make a temporary
connection with sufficient length of cable so that the cable can be switched to
another terminal without splicing. After correct connections are established,
cables shall be cut to their correct lengths, connected to terminals in the
specified manner, and corded together where necessary to hold them in place
in a skillful manner. Jointing of cables shall be in accordance with relevant
Standards and manufacturer's instructions. Materials and tools required for
cable jointing work shall be supplied by the Contractor. Cables shall be firmly
clamped on either side of a ‘straight through joint’ at a distance of not more
than 300 mm away from the joints. Identification tags shall be provided at
each joint at all cable terminations.
2.12 Where cables pass through floor or wall openings or other partitions, suitable
bushes/pipe sleeves of GI shall be provided by the Contractor. The Contractor
shall seal the cables at the bushes/pipe sleeves using
using fire resistant material.
2.13 Cable seals shall be examined to ascertain if they are intact and that cable ends
are not damaged. If the seals are found to be broken, the cable ends shall not
be jointed until after due examination and testing under supervision
supervision of the
Engineer's Representative. Before jointing is commenced, insulation
resistance of both sections of cables to be jointed shall be checked by megger.
63
2.14 In each cable run, some extra length shall be kept at a suitable point to enable
one or two straight
straight-through
through joints to be made, should the cable develop fault at
a later date.
2.15 Conduits / Pipes
2.15.1 Where cable trench is not available, cables shall be laid in GI conduits / pipes
routed along walls / columns / beams / steel structures
structures or buried in concrete
slabs, etc. to suit site conditions. Supply and installation of GI conduits / pipes
(minimum 20 mm diameter), their accessories such as bends, tees, couplers,
etc., saddles, spacers, junction / marshalling boxes and GI hardware rrequired
for installation shall be included in the Contractor's scope. Interval between
supports shall not exceed 1000 mm.
However, at the time of actual execution, if it is found that the cable trays (2.5
mm thick) sag, it shall be contractors responsibility
responsibility to provide additional
supports at no extra cost.
2.15.2 Non-metallic
metallic conduits / pipes shall be used for single core cables of a 3 phase
circuits.
2.15.3 The conduits and pipes shall be properly sealed by the sealing compound/with
Hessian cloth dipp
dipped in bitumen.
2.16 Junction Boxes / Marshalling Boxes
2.16.1 Junction boxes/marshalling boxes shall be hot-dip

hot dip galvanised, weather proof
with IP 55 degree of protection and shall be provided with cable glands for
incoming and outgoing cables. The boxe boxess shall be fabricated from 1.6 mm
thick sheet steel and galvanised. The boxes shall be suitable for mounting on
walls / columns / steel structures, etc. and shall be supplied with mounting
accessories. The front covers of the boxes shall be removable and provided
with gaskets. All the terminals shall be complete with insulated barriers,
terminal studs, washers, nuts, etc. The boxes shall be effectively earthed. The
terminals shall be suitable for terminating 2 nos. 2.5 mm2 conductor on each
side. All terminal
erminal blocks shall be rated for 1100 V, 15 A unless otherwise
specified.
2.16.2 All CT terminals shall be brought to CT junction boxes by 4C x 4 sq. mm.

cables respectively.
2.16.3 Marshalling box shall be provided for marshalling AC and DC supplies. AC

and DC supplies shall be taken from AC and DC distribution board from
control room to outside. Necessary auto changeover schemes shall be
provided for ensuring continuous AC and DC supply to control room.
2.17 Typical cabling details are indicated in drawings are enclosed.
64
3.0 LIGHTING SYSTEM
In addition to the supply of lighting system, the scope of installation work

shall include mounting of lighting panel, lighting fixtures and receptacles at
locations as per the approved drawings. All work associated with installation
such as providing and fixing of wooden blocks, ball sockets, hooks, etc. as
required, drilling holes in walls, ceilings or any civil work including
scaffolding, provision of ladders, etc. together with supply of hardware shall
form part of the Contractor's work. All work items necessary for completing
earthing connections for the lighting system shall be included in the scope of
work.
3.1 Lighting panels, receptacles, light control switches, etc. shall be installed at the
following
owing heights from finished floor / ground level, unless otherwise
specified.
3.1.1 Lighting panels: 1200 mm to the bottom of the panel.
3.1.2 Lighting fixtures
a) Recessed in false ceiling wherever the same is provided.

b) At ceiling level or bottom of beam level in other areas of control
building.
c) Flood light fixtures at approximately 12 m on top of gantry structures
or on poles/masts as specified.
d) Other types of fixtures: At suitable height subject to approval.
3.1.3 Light control switches: 1200 mm
3.1.4 Receptacles with switches
a) 1200 mm or 300 mm in indoor areas as required

b) 1000 mm in outdoor areas
3.2 All light control switches and receptacle units (connected on the same phase)
at one location (such as room entrance), shall be hhoused
oused in one common box.
3.3 All wiring shall be concealed inside the control room. Within the control
room building, casing caping wiring shall be carried out. Space factor (ratio of
total cable cross
cross-section
section to internal area of conduit or casing) for
conduit/casings
onduit/casings wiring shall not exceed 40%. Size of wire chosen shall be
such as to limit the voltage drop to within 2%. Wires with minimum 2.5 sq.
mm. stranded copper conductor shall be used for lighting and 4 sq. mm. for
power sockets. For outdoor are
areas
as minimum 2.5 sq. mm. armoured cable with
stranded copper conductor shall be used. Current density in all cables shall
not exceed 2.5 A/sq. mm. Wires shall be colour coded. Generally, not more
than 8 to 10 lighting points shall be wired in one circuit.
circuit. For calculating
connected loads of various circuits, losses in the ballast shall be considered.
Maximum connected load on any circuit shall be 2500 VA for outdoor areas
and 2000 VA for indoor areas. In large rooms, the lighting system shall be
distributed
uted over three phases.
65
3.4 Circuits for wiring of receptacles and lighting fixtures shall be separate and
wiring for the same shall be done in different conduits/casings. Switches /
receptacles wired on different phases shall be separated by a minimum
distance of 1.8 m.
3.5 Separate conduits shall be used for normal and emergency lighting circuits.
Also wires of different phases shall not be run in the same conduit. However,
different lighting circuits of same phase shall run in the same conduit. Ev
Every
phase wire shall have a separate neutral wire. Neutral wire shall not be
looped.
3.6 For street lighting, steel tubular poles complete with fixing brackets shall be
used. These poles shall be coated with bituminous preservative paint on the
inside ass well as on the embedded outside surface. Exposed outside surface
shall be painted with one coat of red oxide primer. After completion of
installation, two coats of aluminium paint shall be applied. Contractor shall
supply and erect the poles (including
(including foundation work), mount the assembled
fittings, and install the necessary cabling. The Contractor's scope includes
supply and installation of cables required between lighting panel and junction
box mounted on the street lighting pole and between junction
junction box and metal
enclosed controlgear box. Height and type of pole shall be subject to the
Engineer’s approval.
3.7 Conduits, fixtures, junction boxes etc. shall be bonded to the earthing system
by 16 SWG diameter copper wire looped from lighting panel earth ea bus
onwards. Outdoor lighting poles, junction boxes etc. shall be earthed by 8
SWG GI wire.
3.8 Typical lighting installation details are indicated in drawing .
4.0 EARTHING AND LIGHTNING PROTECTION SYSTEMS
4.1 The Contractor shall install bare earth cconductors

onductors as required for the system
and individual equipment earthing. All the work such as cutting, bending,
supporting, drilling, brazing / soldering, clamping, bolting and connections to
structures, equipment frames, terminals or other devices shall be b in the
Contractor's scope. All hardware and consumables such as fixing cleats /
clamps, anchor fasteners, lugs, bolts, nuts, washers, brazing electrodes, flux,
bituminous compound, anti-corrosive
anti corrosive paint, etc. as required for the complete
work shall be included
cluded by the Contractor.
4.2 Tap connections (earthing leads) of more than 500 mm long from main
earthing grid to equipment shall be embedded in the floor by the Contractor
together with associated civil work such as chipping / chasing, concreting and
surfacing,
ing, etc. The concrete cover over the conductor shall not be less than 50
mm.
4.3 The scope of installation of earth conductors in outdoor areas, buried in

ground shall include excavation in earth upto 600 mm depth and 400 mm
width, laying of conductor at 600 mm depth, brazing as required of main grid
66
conductor joints as well as risers upto 500 mm above ground at required

locations and backfilling. Backfilling material to be placed over buried
conductor shall be free from stones and other mixtures. Backfill shall be
placed in layers of 150 mm, uniformly spread along the trench and compacted.
If the excavated soil is found unsuitable for backfilling, the Contractor shall
arrange for suitable material from outside.
4.4 Wherever earthing conductor crosses underground

underground service duct and pipes, it
shall be laid 300 mm below them. If the distance is less than 300 mm, the
earthing conductor shall be bonded to such service ducts / pipes.
4.5 The scope of installation of electrodes shall include installation of electrodes

in constructed earth pits, and connecting to main buried earth grids. The scope
of work shall include excavation, construction of the earth pits including all
materials required for treatment (salt, charcoal, chemicals, etc.), placing the
electrode and connecting
conn to main earth grid conductors.
4.6 The work of embedment of earthing conductor in RCC floors / walls along
with provision of earth plate inserts / pads / earth risers shall be done by the
Contractor preferably before the floors / columns / walls are cast. ca The
embedded conductors shall be connected to reinforcing rods wherever
necessary.
4.7 The scope of installation of earthing leads to the equipment and risers on steel
structures / walls shall include laying the conductors, brazing / cleating at
specified
d intervals, brazing to the main earth grids, risers, bolting at equipment
terminals and coating brazed joints by bituminous paint.
4.8 Earthing and lightning protection system conductors along their run on walls /
columns, etc. shall be cleated at an interva
interval of 750 mm.
4.9 Main earthing conductor shall be buried below the trench at crossing points.
4.10 Metallic frames of all electrical equipment shall be earthed by two separate
and distinct leads and then connected with earthing system.
4.11 Neutral of a transformer sshall

hall be earthed to two separate earth electrode pit by
two separate earth leads.
4.12 Crane rails shall be connected to the earthing system.
4.13 An earthing mat shall be provided under the operating handle of the
disconnector. Operating handle of the disconnector
disconnector and the supporting
structure shall be bonded together by a flexible connection and connected to
earth grid.
4.14 Metal pipes and cable conduits shall be effectively bonded and earthed by
earthing clamps efficiently fastened to the conduit at both ends.
4.15 Neutral
ral connection shall never be used for equipment earthing.
67
4.16 A separate earth electrode shall be provided for each lightning arrester and for
each lightning conductor down comer.
4.17 Cable sheaths and screen shall be bonded to the earthing system.
4.18 Armour of multicore cables shall be bonded to earthing system at both ends,
while that of single core cables shall be earthed at source end only. The size
of conductor for bonding shall be appropriate with the system fault current.
4.19 Conduits, fixtures, junction boxes,

boxes, etc. shall be bonded to the earthing system
by 16 SWG diameter copper wire looped from lighting panel earth bus
onwards. Outdoor lighting poles, junction boxes, etc. shall be earthed by 12
SWG copper wire.
4.20 Street light pole and junction box shall be earthed with 12 SWG copper wire
tapped off from the 25 x 3 mm copper earthing conductor to be laid along the
street lighting cable.
4.21 All metallic parts such as transformer, fence, gate, etc. shall be properly
earthed.
4.22 Wherever earthing conductor passes tthrough

hrough walls, galvanised steel pipe
sleeves shall be provided for the passage of earthing conductor. The pipe ends
shall be sealed by the Contractor, by suitable water-proof
water proof compound. Water
stops shall be provided wherever earthing conductor enters the building
b from
outside below ground level.
4.23 All connections in the main earth conductors buried in earth / concrete shall be
brazed type. Connections between main earthing conductor and earth leads
shall also be of brazed type. Connection between earth leads
leads and equipment
shall be by two bolts.
4.24 Installation of lightning conductors on the roof of buildings shall include

laying, anchoring, fastening and cleating of horizontal conductors, grouting of
vertical rods wherever necessary, laying, fastening / cleat
cleating
ing / brazing of the
down comers on the walls / columns of the building and connection to the test
links to be provided above ground level.
4.25 The lightning protection air termination rods and / or horizontal air
termination conductors shall be fixed in a fi
firm
rm manner. The necessary
accessories such as cleats, clamps, brazing materials, bolts, nuts, shall be
supplied by Contractor.
4.26 Air termination systems shall be connected to earthing system by down

conductors. There shall not be any sharp bends, turns and kinks in the down
conductors.
4.27 All joints in the down conductors shall be of brazed type. All metallic
structure within 1 metre of down conductors shall be bonded to lightning
protection system.
68
4.28 Every down conductor shall be provided with a ‘test link’ mounted on wall /
column at about 1000 mm above ground level housed in a 16 SWG GS
enclosure. The test joint shall be directly connected to the earth electrode.
4.29 The lightning protection system shall not be in direct contact with
underground metallic serv service
ice ducts, cables, cable conduits and metal
enclosures of electrical equipment. However, all metal projections, railings,
vents, tanks, etc. above the roof shall be bonded together to form a part of roof
grid.
4.30 Lightning protection system down conductors shall not be connected to other
earthing conductors above ground level. In addition, no intermediate earthing
connection shall be made to lightning arresters and transformer, whose
earthing leads shall be directly connected to electrode pit.
4.31 The earth conductor

nductor below ground level shall be MS while that above ground
shall be GS. The connection between MS and GS shall be made above
ground.
4.32 Earth electrodes and pit
4.32.1 Treated earth pits shall comprise of treatment material such as salt and
charcoal
oal or any other conductivity enhancing compound. Treatment material
placed around the electrode shall be finely graded, free from stones and other
harmful mixtures. Backfill shall be placed in 150 mm thick uniformly spread
and compacted layers. If excavated
excavated soil is found unsuitable for backfilling, the
Contractor shall arrange for a suitable soil from outside.
4.32.2 Earth electrodes shall be fabricated from minimum 40 mm diameter, 3m long,

heavy gauge MS/GI pipe. The minimum spacing between adjacent electrodes
shall be 6 m. Design and constructional details of electrode pit shall be
subject to the Engineer's approval.
4.32.3 Electrodes shall, as far as practicable, be embedded below permanent moisture

level.
4.32.4 Test pits with concrete covers shshall

all be provided for periodic testing of earth
resistance. Installation of electrodes in test pits shall be suitable for watering.
The necessary materials required for installation of test pits shall be supplied
and installed by Contractor. The installat
installation
ion work shall also include civil
works such as excavation / drilling and connection to main earth grid.
4.32.5 Treated earth pits shall be treated with suitable treatment material mentioned
above, if average electrical resistivity of soil is more than 20 ohm metre.
4.32.6 Typical earthing installation details are indicated in the drawing.
69
TESTING AND COMMISSIONING

COMMISSI
5.0 SCOPE
5.1 The Contractor shall carry out commissioning tests/completion checks in the
presence of a engineer appointed by the Employer/Enginee
Employer/Engineer. The
commissioning engineer may verify any commissioning tests/completion
checks to satisfy himself that the plant is fit and sound. The evaluation of test
results and decision passed by the commissioning engineer regarding the test
results will be final
final and binding on the Contractor. Any additional tests or
repetition of tests to establish satisfactory operation of any equipment shall be
carried out by the Contractor if so desired by the commissioning engineer at
no extra cost. The test report needs to to be signed by the engineer appointed by
the employer, which shall be submitted during handing/taking over.
5.2 The commissioning tests/completion checks to be carried out shall include, but
not be limited to, those described in subsequent paragraphs, as applicable to
the individual equipment / system.
6.0 COMPLETION CHECKS/ COMMISSIONING TESTS
6.1 Preliminary Checks
a) Name plate details according to approved drawings / specifications

b) Any physical damage or defect and cleanliness
c) Tightness of all bolts, clamps and connections
d) Oil leakages and oil level
e) Condition of accessories and their completeness
f) Clearances
g) Earthing connections
h) Correctness of installation with respect to approved drawings /
specifications
i) Lubrication of moving parts
j) Alignment
k) Correctness
ss and condition of connections
6.2 General tests
In general, the following tests shall be carried out on all the equipment /
systems, as applicable.
a) Insulation resistance measurement

b) Dielectric tests
c) Phase sequence and polarity
d) Voltage and current rat
ratios
e) Vector group
f) Resistance measurement of winding, contacts, etc.
g) Continuity tests
h) Calibration of indicators, meters, relays, etc.
i) Control and interlock checks
j) Settings of equipment and accessories
70
k) Checking of accuracy / error

l) Checking of operating characteristics,
charac pick-upup voltages and currents,
etc.
m) Operational and functional tests on equipment, accessories, control
schemes, alarm / trip / indication circuits, etc.
n) Measurement of guaranteed / approved design values including
lighting levels, earth resistance
resista measurement, etc.
o) Complete system commissioning checks
6.3 Among other commissioning tests, the following shall be carried out at site
after completion of installation. Contractor shall ensure use of calibrated test
equipment having valid calibration test certificates from standard laboratories
traceable to National Standards / International Standards. All tests shall be
carried out in the presence of Engineer’s representatives.
6.3.1 Transformers
Test the transformer oil for tan

tan-delta, acidity, resistivity
sistivity and dissolved gases,
Capacitance and tan delta test of condenser type bushings, before assembly.
Test the transformer for the following:
a) Voltage Ratio test on all taps.

b) Short circuit impedance at full winding
c) Magnetic balance at full winding
d) Core
ore loss at service tap at low voltage
e) Capacitance and tan delta
f) Operational
rational check on Transformer OC OCTC
g) Operational Check of all mechanical relays used for Buchholz, OTI,
WTI, etc
h) Transducer check as described in SCADA system.
6.3.2 Circuit Breakers
Check control wiring for correctness of connections, continuity and IR values,

contact resistance as all three phases, Breaker closing and tripping time,
Simultaneous closing of all three phases, Check electrical & mechanical
interlocks are satisfied.
6.3.3 33/ 11 kV Indoor switchgear Circuit Breakers
Check alignment of breaker trucks for free movement, Check correct

operation of shutters, Check control wiring for correctness of connections,
continuity and IR values, contact resistance as all three phases,
pha Breaker
closing and tripping time, Simultaneous closing of all three phases, Check
electrical & mechanical interlocks are satisfied.
71
6.3.7 Distribution Boards
Power frequency high voltage test, insulation resistance test, operation tests.
6.3.8 Voltage Transformers
Open delta test with low voltage, wherever required, measure core loss from
LV side, Voltage ratio measurement with low voltage
6.3.9 Current Transformers
Capacitance and tan delta test, Magnetization characteristics, Current Ratio

Ra
measurement.
6.3.10 Relays
Check of external wiring, relay settings, Secondary current injection and

trial tripping
6.3.11 Cables
All cables shall be tested for insulation resistance before and after terminating
/ jointing.
Cable core shall be tested for

a) Check details as per specification
b) Check for physical damage
c) Absence of cross phasing
d) Megger test between each core and armour/sheath
e) Insulation resistance to earth
f) Insulation resistance between conductors
g) Connections
h) High volta
voltage test
6.3.12 Lighting System
Commissioning tests stipulated in applicable standards and code of practice

covering all lighting system equipment
6.3.13 Earthing System
Continuity of all conductors and joints shall be checked. The Engineer’s

representatives
entatives may ask for earth continuity tests, earth resistance
measurements and other tests, which in his opinion are necessary, to prove that
the system is in accordance with design, specification, code of practice and
electricity rules. Earth grid resistance
resistance value should be not greater than one
ohm.
72
7.0 TAKING OVER
7.1 No item of the entire Works will be certified for 'Taking over' unless it has
passed all the tests.
7.2 A 'Taking Over' Certificate for Works will be issued only after the requisite
requisi
documentation of commissioning tests are duly compiled and approved by the
Employer / Engineer.
73
Section VI - E – Drawings, Test Certificates, O&M manuals
1.0 DRAWINGS
1.1 General
1.1.1 Separate drawings shall be prepared and submitted for each equipment.
1.1.2 All drawings to be furnished by the Contractor shall be in standard size of

sheets with maximum size being A0. Basic GA drawings of all systems shall
be in A0/A1/A3
/A3 file. A4 size drawings will not be acceptable.
ceptable. Drawings shall
contain the following particulars in the title block at lower right hand corner in
addition to the Contractor's name, date, scale, drawing number, drawing title
etc.
a) Client : Electrification Division, Distribution

Construction
on Department, Distribution Services,
Bhutan Power Corporation Limited.
b) Project Title : Up-gradation
gradation of 33/11 kV substation.
c) Project No. : BPC/DS/DCD/ED/C-09
1.1.3 A blank space of size 100 mm x 100 mm shall preferably be provided for the
Engineer's's approval stamp and provision shall also be made by way of a block
for details of revisions to be recorded. The drawing no. shall be marked with a
subsequent revision no. every time the drawing is revised. The drawing title
shall also identify name of the substation/site.
1.1.4 The equipment and systems, which are to be bought out from the sub
sub-vendors,
are also required to be approved by the Engineer prior to manufacture. The
relevant technical literature and drawings pertaining to such equipment and
systems shall be submitted for approval.
1.1.5 Three copies (One original and two copies) of the drawings shall be submitted.
Contractor shall ensure that the contents on copies of drawings are legible and
are complete with all details. Drawings that are not legible
legible or are incomplete
will not be reviewed.
1.1.6 One copy of reviewed/approved drawings will be furnished to the Contractor.

Drawings returned not approved/approved with comments shall be
resubmitted for review/approval till the final approval is obtained.
obtained. Delays
caused by submission of incomplete/incorrect drawings shall be to
Contractor's account.
1.1.7 Drawings submitted by sub

sub-vendor/sub-contractor
contractor shall carry Contractor's
approval stamp and the Contractor shall be responsible for their contents,
contents
accuracy and completeness.
1.2 Detailed Drawings
1.2.1 The Contractor shall submit to the Engineer all equipment data and detailed
drawings. These shall include general arrangement, details of equipment,
74
foundations, cable routing, openings in walls aandnd floors, wiring diagrams,

cable schedules, interconnection diagrams, etc. necessary for the erection of
plant. These drawings/data having been corrected or amended as necessary
based on the Engineer's comments shall become the 'Approved' drawings/data
to be used for manufacture and erection of plant.
1.2.2 Minimum details required on drawings of different categories are given below:
List of Drawings : A detailed list of drawings which the Contractor

proposes to prepare for each substation/site
indicating
ating therein drawing nos. and titles.
Programme : i. All activities from the start date upto

commissioning shall be included.
Separate programmes shall be furnished
for each of the activities of each
substation/ site.
ii. Earliest and latest occurrence
ccurrence of each
activity.
iii. Constraints, if any.
(The activities for each of the items shall essentially cover time-table
time for
activities such as placement of order with sub-vendors,sub vendors, engineering,
submission of drawings, review and approval by the the Engineer, manufacture,
inspection, delivery, erection, testing and commissioning. All events shall be
represented in a proper sequence of occurrence with due consideration for
inter-dependent
dependent activities and all periods shall be counted from the start date).
d
Type of Drawing Minimum Details Required
Single line diagrams : i. All equipment connections with ratings,

polarities, protection and metering
details etc.
ii. Cable details for all circuits.
iii. Details of relays, meters and major
components associated with each circuit.
iv. Reference drawings.
General : i. Dimensional layout drawings

Arrangement covering complete layout
(Equipment, cabling, earthing, lightning
protection, lighting, etc.)
ii. Plans and sections as required
requi to show
details access space/ clearances, etc.
iii. Reference drawings
In addition to the above, the Contractor shall also submit adequate copies of
all relevant supporting literature/catalogues.
75
1.3 Record Drawings
1.3.1 Within eight (8) we

weeks
eks of successful commissioning tests, the Contractor shall
furnish the 'Record' drawings. Submission to and approval by the Engineer of
the 'Record' drawings shall be pre-requisite
pre requisite for the 'Taking Over' Certificate.
The drawings shall show the whole Pla Plant
nt as installed and shall include
electrical/mechanical and civil components with schematic and wiring
diagrams for all items of electrical equipment included in the Works. The
record drawings shall be furnished in neatly bound volumes. Reduced copies
of the relevant drawings shall be included in the operating and maintenance
manual.
1.4 Specific Requirements
1.4.1 Following information/ drawings shall be submitted after the award of

Contract for approval of the Engineer:
a) Updated program along with the list of drawings.
b) 33/ 11 kV distribution and station transformers :
i. General arrangement drawing showing plan, front and side

elevations and all accessories and fittings with detailed Bill of
Material. Detailed dimensions, net and shipping weights, crane
lift for untanking, size of lifting lugs and eyes, clearances
between HV, MV, LV terminals and to ground, identification
for fittings and accessories, centre lines in both the directions,
details of anti
anti-earthquake
earthquake clamping device, details of HV, MV,
LV bushings,
bushings, MV, LV, cable box, foundation and transport
details, detailed manufacturer's catalogues/literature of
accessories actually being supplied.
ii. Rating and terminal marking plate showing polarity, vector
group and other details.
iii. Valve schedule pla
plate
iv. GA drawing of OCTC,
O marshalling box, etc.
v. Cooler control schemes
vi. Control and wiring diagram of OCTC,
O TC, marshalling box, etc.
vii. Inter
Inter-connection schedule.
d) Outdoor substation equipment/ systems:
i. Detailed dimensioned plan and sections (for each equipment

and for the substation) indicating therein salient features of
equipment such as fault withstand capacity, overall dimensions,
centre of gravity, weight, etc., detailed bill of material with
makes for equipment, mounting details of equipment with
structur
structuree identification of clamps and connectors etc.
ii. Earthing and lightning protection drawings, equipment layout,
cabling, lighting and earthing systems drawings for outdoor
areas.
76
iii. Detailed drawings for the substation structures, equipment and

clamps/con
clamps/connectors.
iv. Foundation layout drawings.
v. Control and protection schematic diagrams.
vi. Detailed one line diagrams.
viii. Cable schedules and interconnection wiring diagrams.
ix. Typical installation detailed drawings.
x. Manufacturer's cata
catalogues/literature
logues/literature etc. of equipment being
supplied.
e) 11 kV indoor switchgear:
i. Complete assembly drawing of the switchgear showing plan,

elevation, and location of cable terminations and control cable
terminal blocks for external wiring connections as well as
sectional view of each type of panel, such as breaker, busbar,
cable and metering sections.
ii. Foundation plan showing the location of channel sills,
foundation bolts and floor openings.
iii. Schematic diagram (AC and DC) for control, protection,
indicatio
indication,
n, alarm and trip circuits, relays, instruments, space
heaters etc. for each type of feeder.
iv. Single line diagram with details of busbars, components, cable
sizes and detailed bill of material with makes etc. for each
feeder.
v. Complete wiring diagrams including including terminal wiring
designation.
vi. Cable termination details with dimensions.
vii. Manufacturer's catalogues/literature etc.
f) 415 V AC and 110 V DC distribution boards, lighting panels etc.
i. Fully dimensioned general arrangement drawings for each of

the above
above complete with plan, elevation and sectional views
and complete bill of material, foundation drawing and cable
entry details.
ii. One line diagrams
iii. Block logic diagrams
iv. Schematic diagrams for all power, control, protection and
indication circuits.
v. Alarm annunciation
annu scheme drawings.
vi. Wiring diagrams.
vii. Manufacturer's catalogues/literature etc. for numerical relays
and all items.
j) Lighting system
Lighting layout drawings for indoor and outdoor areas showing layout
of lighting fixtures, conduit/cables, ligh
lighting
ting circuit distribution scheme,
complete bill of material, locations of control switches, receptacles,
etc. and mounting details for fixtures, switches and receptacles as well
77
as manufacturer's catalogues/literature showing dimensions, weights,

light distribution
tribution diagrams (zonal and isocandela), etc.
k) Earthing and lightning protection systems
Layout drawings for earthing and lightning protection systems showing

earthing grid, locations of earth electrodes, routes of conductors,
interconnections, earth leads to various equipment, bill of material etc.
l) Miscellaneous systems
systems:
Detailed general arrangement, schematic and other drawings, bill of

material and manufacturer's catalogues/literature.
m) A schematic-wiring
schematic diagram and general-arrangement
angement drawing of the
AR offered.
n) Typical installation drawings
Cabling, lighting, earthing and lightning protection as well as

miscellaneous system drawings showing all necessary details.
1.5 Submission of Drawings
1.5.1 The list of drawings aand the programme

amme shall be submitted within 15
1 days
from the start date of the project.
1.5.2 All other drawings shall be submitted progressively thereafter within a period
of 90 days. Sequence of drawings to be submitted within the above period
shall be finalised with the Engineer in advance.
2.0 TEST CERTIFICATES
2.1 Type Test Certificates
2.1.1 Type test certificates for the following items shall be furnished after the award
of the contract and finalizing the vendor:
a) MV and LV Cables
b) 33 kV and
nd 11 kV switchgear, battery & battery charger.
d) All Transformers, OCTC,
OC etc.
2.1.2 Type test certificates shall be furnished for tests carried out on similar
type/design of equipment.
2.1.3 Type test certificates will be accepted, if date of the cert

certificate
ificate is not earlier
than 5 years as on date of Bid submission and in the event there is any
deviation to the tested equipment from the offered equipment or the certificate
is earlier then the stipulated period, the Employer reserves to get the type
testing
ing done without any extra cost.
78
2.2 Routine Test Certificates
2.2.1 Routine test certificates for all the plant items and accessories shall be
furnished.
2.2.2 Routine test certificates shall be furnished in addition to test reports, which
will be collected
ected at the time of inspection.
2.2.3 Routine test certificates shall be furnished for review by the Engineer within
seven (7) days after completion of inspection of relevant item or as instructed
by the Engineer in case of items for which witnessing of tests is waived.
3.0 OTHER DOCUMENTS
3.1 Technical catalogues, descriptive literature, characteristic curves, write-up

write on
schemes where required in support of relevant control/annunciation drawings
etc. shall be furnished for all the items of plant and accessories/components.
3.2 Documents pertaining to cables shall in addition, include current ratings,

derating factors, physical and electrical data, recommended bending radii etc.
3.3 Documents in respect of lighting system equipment shall include data in

respect of each type of lighting fixture/switch, receptacles/miniature circuit
breaker and wires to be used in circuit wiring. Data on lighting fixtures shall
include dimensional drawings, cable entry facility, mounting details and
weight, light distribution
distribution diagrams, light absorption and utilisation factors,
lamp data etc.
3.4 Contractor shall note that the documents mentioned above shall be made
available along with relevant drawings (listed in Clause 1.4.2 above) of plant
items/accessories/componen
items/accessories/componentsts etc. as supporting documents to facilitate
expeditious review of such drawings.
4.0 OPERATING AND MAINTE

MAINTENANCE MANUALS
4.1 The Contractor shall provide five (5) bound sets of approved manuals. All
descriptive leaflets, instruction sheets, charts, listlists,
s, pamphlets and other
documents that are used in compiling each manual shall be contained in one or
more binders designed to prevent loss of contents. Each binding shall be titled
with the name of the Employer, the name of the project, the Contract number,
numbe
the name of the Contractor and with information to identify the subject matter
and shall include a detailed index to all the literature contained therein.
4.2 The manuals shall be initially approved in draft form by the Engineer and shall
cover all items
ms of the Works. For this purpose, three (3) draft copies shall be
submitted to the Engineer. Final submission of manuals shall be done after
satisfactory completion of commissioning tests. A mere collection of
manufacturers' descriptive leaflets will not
not be acceptable in satisfaction of this
Clause. Information pertaining to items selected for this project shall be
clearly indicated in such leaflets. The manuals shall comprise both operating
79
instructions and maintenance instructions. The Operating man

manual
ual should also
highlight operation of the Plant in conjunction with the system. Thus, a
general tie-up
up between system and equipment shall be available in the
manuals.
4.3 A separate section of a manual shall be devoted to each size and type of
equipment.. It shall contain a detailed description of its construction and
operation and shall include all relevant pamphlets and a list of parts with
procedure for ordering spares. Operation of electrical equipment shall be
described step by step giving the comp complete
lete sequence of operation. The
detailed sections of the manual, if necessary, shall contain further maintenance
instructions and fault location charts.
4.4 The manuals shall be printed on A4 size sheets and shall be bound. Reduced
copies of record draw
drawings shall also be included in the manuals.
4.5 The operating instructions shall include the following:
4.5.1 Step by step directions on setting the plant to work, listing all adjustments and
settings necessary for the correct functioning of the plant.
4.5.2 List of plant alarms giving possible causes for alarm initiation and sequence of
remedial actions to be taken.
4.5.3 Instructions on monitoring of plant performance and sample log sheets for
each plant item, to be filled by operators on a routine ba
basis.
4.5.4 "Do's" and "Don'ts" in plant operations. Operators' attention shall be drawn to
all operations considered to be dangerous to operators or likely to cause
damage to the plant.
4.6 The maintenance instructions shall include the following:
4.6.1 Checking, testing and replacement procedures to be carried out on all plant
items on a daily, weekly and monthly basis or at longer intervals to ensure
trouble-free
free operation.
4.6.2 Fault locations and remedy charts to facilitate tracing the cause of
o
malfunctions or breakdown and correcting faults.
4.6.3 A 'spares schedule' which shall consist of a complete list of itemised spares for
all plant items with ordering references and part numbers.
4.6.4 A complete list of manufacturer's instructions for operation and maintenance

of all bought-out
out equipment. The list shall be tabulated in alphabetical order
giving the name of supplier/manufacturer, identification of the plant item
giving the model number and the literature provided including instruction
leaflets and drawing numbers.
4.6.5 Full instructions to cover the complete dismantling and re

re-assembly
assembly of all
items of plant.
80
4.6.6 Part-list
list and drawings or exploded diagrams for such items of plant showing
manufacturing tolerances, matching clearances between machined components
at the time of supply, maximum wear and clearances permitted to facilitate
replacement.
4.6.7 Complete list of recommended lubricants and lubricating chart, insulating oil
and insulation checking/ replacement chart.
81
SECTION VI -F - CONTRACTORS SAFETY PROGRAMME
1.0 SAFETY ORGANISATION
1.1 Safety Policy
The Contract Organisation shall have a written health and safety policy issued
by the Chief Executive of the Organisation; appropriate to the scale and nature
of the risks involved
ved in the contract works. A copy of the Policy shall be made
available to the Employer at the time of contract in evidence of Contractor’s
commitment to management of employee's health and safety and compliance to
Statutory and regulatory requirements. ThThee Policy along with its Component
operation procedures shall be evidenced as working document publicised
among Contractor's and his Sub-contractors'
Sub contractors' employees through appropriate
language/s. All Contractors’ employees shall be familiar with the Safety Policy
Poli
and their role and obligations in its implementation. The Policy shall meet the
relevant statutory and regulatory requirements and the requirements of the
Employer. The Policy shall periodically be reviewed for updating with respect
to new and emerging legal and other requirements.
The contractor shall also BPC safety instructions which will be given
successful contractor.
1.2 Safety Representative
a) Contractor shall appoint a Safety Representative (SR) meeting statutory

competence requirements, with a minimum
minimum experience of five years of safety
management in comparable contracts, approved by the Employer on the basis
of his qualification and experience. The SR shall give his whole time to the
superintendence of the Health and Safety Programme of the Contrac
Contractor.
b) The Contractor shall also nominate in writing competent Safety Appointees

from different disciplines to assist SR in implementation of health and safety
measures in their routine contract works. The SR shall have sufficient authority
to direct Contractor's
ctor's or his Subcontractor's personnel to meet health and safety
requirements and to stop performance of work until such requirements are met.
1.3 Employee consultations, Safety Committee and communication
a) Contractor shall ensure full involvement of all his employees recognising their
right to consultation on health and safety matters. The safety appointees of the
various areas, in conjunction with the SR shall be responsible for ensuring
employees' involvement through routine safety inspections, hazard and risk
assessment in new and changed works and their control. Contractor shall
maintain appropriate operating procedures to guide these requirements.
b) The Contractor shall also appoint a Safety Committee (SC) comprising of

Safety Appointees from the various areas under the chairmanship of the SR
.The committee shall meet at periodic intervals to discuss the status and
adequacy of the safety management, and any safety concerns of the employees.
The committee shall also formulate and validate the safety procedures
procedu
82
incorporating controls to prevent or mitigate hazards and risks before

submission for approval by Employer / Engineer. The minutes of SC meeting
shall be submitted to the Employer / Engineer. SR shall maintain the records of
the meetings.
c) Contractor shall
hall communicate to the employees regularly on job hazards
applicable to their tasks in hand. Safety Appointees (SA's or any of SR's
nominees) shall hold 'Toolbox talks' for this purpose on a routine basis before
undertaking any safety critical and / or no
non-routine
routine activities. Weekly meetings
of the Contractor and his Subcontractor attended by the SR and SA's shall
include safety as a key item in the agenda to discuss hazards and risk
assessments, Job safety analysis, control procedures and to review accide
accidents
and incidents (Near-miss)
(Near miss) for remedial measures to prevent such occurrence.
The minutes of the meeting shall be submitted to the Employer / Contractor.
SR shall maintain the records.
1.4 Contractor's safety reports
The Contractor shall submit a monthly w written

ritten report to the Employer /
Engineer, which shall be due on the fifth workday of every month. The health
and safety of all full time, part
part-time,
time, permanent, temporary contract employees
and any outsourced employee undertaking any part of the contract-works
contract shall
be included in the safety report. The report shall include the total number of
working hours for the month, the number of recordable accidents and the
number of lost-time
time accidents. A cumulative trend plot of the monthly severity
and frequency ratete of the reportable accidents shall be included in the monthly
safety report and calculated as:
SEVERITY = LOST MANDAYS DUE TO LOSS

LOSS-TIME
TIME INJURIES X 1000000
MANHOURS WORKED
FREQUENCY=
= NUMBER OF LOST TIME INJURY X 1000000
MANHOURS WORKED
Contractor
ntractor shall arrange to display the safety statistics and the cumulative plot
of severity and frequency of accidents mentioned above painted in a board
prominently displayed, as a means of encouragement and assurance to all
interested parties and for pub
publicising the safety achievements.
1.5 Contractor's accident/incident reports
"Accident" for the purpose of this clause is defined as "Undesired event giving
health, injury, damage or other loss" and "Incident" is defined
rise to death, ill-health,
as “Event that gavegave rise to an accident or had the potential to lead to an
accident”. An accident where no ill health, injury, damage or other loss occurs
also referred to as "near-miss".
"near Incident includes near miss.
The Contractor shall report orally, to Employer and Engineer

Engineer regardless of their
extent, duration and severity, immediately on occurrence of all accidents
resulting in:
83
a) personal injury,
b) property damages,
c) Fires,
d) spills and
e) Near misses.
Contractor shall submit the accident / incident report in writing to Employer

Employe /
Engineer within 24 hours of its happening in the form as prescribed by the
governing statute or in the absence of which, in the form prescribed by the
Engineer. Contractor shall detail in the Accident / Incident report, the
particulars of the dangerous occurrence leading to the accident, lost time of
absence due to accident, root cause analysis and the corrective and preventive
actions to prevent such recurrence. In addition, Contractor shall include his
estimate of the impact of accident on project schedule.
schedule. Incidents shall also be
reported in the same manner identifying root cause/s to eliminate such potential
occurrence or risks.
1.6 First - aid personnel and facilities
a) The contractor shall make available first-aides,

first first-aid
aid boxes and / or first aid
stations as per statutory requirements. The persons holding current certificates
of competency of recognised institutions in prescribed numbers as per any
governing statute and in the absence of such regulatory requirement a
minimum of two first-aides
first for each area of work for every hundred workmen
shall be available. First-aides'
First aides' names shall be prominently displayed.
b) The first -aid

aid boxes shall display contents of medical and medicinal articles
with quantity maintained, which shall be in accordance with ggoverning
overning statute.
Nominated first-aider
aider shall replenish stock promptly.
c) The first-aid
aid refresher training shall be provided at least once in a year and all
employees shall be encouraged to undergo first-aid
first aid training. A record shall be
kept of all first aid
aid treatments with particulars of treatment and personnel
providing the treatment.
1.7 Ambulance room and ambulance vans
Employer shall arrange for an ambulance room and an ambulance van directly
or outsource the facilities meeting the governing statutory needs
needs for prompt
transportation of serious cases of accident and or sickness to the Hospital. Such
facilities shall be maintained in good repair and equipped with facilities such as
dry powder type extinguishers, flashlights Portable Oxygen Unit, self- self
containeded breathing apparatus, etc as prescribed by the governing statute.
1.8 Induction and job

job-safety training
a) Contractor shall maintain a procedure for identification of the training needs

and training his employees to create a health and safety conscious work force
f
that will comply with the law and safety requirements of the Organisation. He
shall also maintain a procedure for safety induction and initial training as well
as follow-up
up training on the job safety for new entrants. All employees shall
84
receive effective
ctive training and periodic refresher training on the operation
control procedures specific to their tasks designed to control the job job-safety
risks. A booklet of such operation control procedures and safety rules with
need based pictorial illustrations shall
shall be made available to all employees who
are to learn and be familiar with such procedures. All training shall be
monitored for effectiveness as per established procedures. Contractor shall
maintain records of all training.
b) Safety Representative and Safe

Safety
ty Appointees shall conduct regular fortnightly
or weekly mock--safety
safety drills for different imaginary accident scenarios, in
premeditated work so as to provide on-job
on training such as:
i use of safety appliances such as water monitors, hydrants, hydrant

pumps, fire--hoses,
hoses, extinguishers, breathing apparatus and safety harness
for working at height,
ii response to health & safety emergencies,
iii fighting fires using different equipment and
iv first aid
Participants shall receive training during mock

mock-drills through rolee-play of their
normal expected tasks during emergencies and fire fighting. The degree of
demonstrated ability in the chosen tasks during such safety drills shall be
recorded as participants' competence level for planning his further training. The
experience
ce gained in mockdrills shall be used to update of operational control
procedures and the training needs. The roster of participants and contents for
routine mock-drills
drills shall be appropriately planned to cover all employees in the
training at least once in four months.
c) The Safety Representative and Safety Appointees shall be trained on a

standardised comprehensive advanced training programme covering safety
management, legal aspects, techniques of hazard identification and risk
assessment and specific job
job-safety
safety in various disciplines of the plant and
equipment of the Contractor. The training records shall be maintained subject
to audit by Employer / Engineer. Training effectiveness shall be assessed and
recorded and used as input for further training plans of the employee.
1.9 Health and Safety Promotion
Safety posters, banners and slogans displayed for safety promotion shall be
rotated at frequent intervals. The Contractor is encouraged to have safety
promotion as an item in the safety committee agenda. Contractor
Contractor is encouraged
to include safety promotion programmes such as safety bulletins, magazines,
competitions in slogan and poetry writing on safety, screening of safety films,
celebration of national safety and environmental day, safety suggestion
schemes and safety library, etc.
1.10 Purchase and Procurement Control
a) The Contractor shall maintain a procedure for control of his purchases to

ensure that all safety requirements are appropriately vetted by the safety
personnel during all stages of procurement inc including
luding planning of
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specifications, inspection for acceptance and commissioning in order that

threats to safety are not overlooked and appropriate attention is paid to the
training of personnel in the operation of Contractor's new or changed
machinery and their
heir operation control procedures, to prevent / control risks.
b) Contractor shall exercise due diligence in appointing his Sub-contractors

Sub contractors and
outsourcing contract services that no new health and safety threats are created.
Contractor shall ensure personnel of Sub-contractors
contractors and outsourced contract
services are competent in health and safety management to meet the Policy
requirements. They shall be made aware of the safety rules, emergency
procedures and any information that will have a bearing on the safety,
safet health
and related contractual obligations
1.11 Hazard Identification and Risk Assessment
a) Contractor shall ensure that his key personnel and safety personnel are trained
to be competent in hazard identification, risk assessment and risk control
processes. Contractor shall on a routine basis identify, evaluate and control all
health and safety risks especially in the hazardous work activities and also to
validate the previous risk assessments. Elements such as hazard identification,
evaluation of risks with existing control measures in place and estimate of
tolerability of the residual risks shall be an ongoing process. Any additional /
new control measures shall be designed based on this process on need basis.
b) Contractor shall maintain a Hazard Identificat

Identification,
ion, Risk Analysis and Risk
Control Manual (HIRARC) pertaining to all his activities duly updated as
detailed above. The HIRARC manual shall be made available to the Engineer
during regular inspections and audits.
1.12 Work Permits
The Contractor shall maintain

maintain a work permit procedure to limit the hazardous
processes and high risks tasks to authorised personnel, who shall be informed
of the job safety analysis and the job specific safety precautions, on issue of a
work-permit.
permit. The work permit issued under the procedure shall be valid for a
specified period and shall be issued only after all safety precautions are
fulfilled and duly verified by SR / SA or specialists who are authorised for
safety certification as a prerequisite for issue of a work permit. The work w
permit shall be appropriate for the purpose for which it is issued. The different
work-permits are:
a) Safety Work Permit (SWP)
SWP is mandatory for working in heights, on fragile roofs such as Asbestos or

such roofing works, Steel Erection, Work over w water,
ater, a live substation or
switchyard even if section of work is not electrically charged, Demolition,
Blasting and such potentially hazardous Contract works in the opinion of the
Employer / Engineer.
86
b) Electrical Safety permits/Lock

permits/Lock-out and tag out (ESP: LOTO)
Contractor shall institute an electrical safety permit system to ensure safe

electrical isolation. Safety permits shall not be issued until safe release tag is
placed on the equipment isolated on all isolating points. The safety permit shall
be returned
urned on satisfactory completion of the job by the executing agencies
duly signing off indicating that all shorts and grounds and men and materials
are removed from the job and that the job is safe for energising. This is a
prerequisite to energise the isolated
isolated equipment. The safety tags shall be
collected in the order i.e. first the isolated equipment and lastly the tag on the
main control of the equipment. The tags and permit system shall be auditable.
1.13 Job Safety Inspection
The contractor shall maintain

maintain a procedure for Safety Inspection at routine
intervals to provide assurance that the instituted safety procedures are in place
to prevent deviations from established standards that could lead to a safety
hazard and consequential risk. The Contractor shal shalll establish appropriate
standardised checklists for systematic job safety verification to ensure:
a) set standards are followed without deviation,

b) employees are competent to perform as per prescribed operation control
procedures,
c) monitoring of safety of the various work areas/tasks and
d) adequacy of existing operation control procedures and practices to
mitigate and eliminate risks.
Should the existing operation control procedures prove inadequate and the
residual risks are higher than tolerable levels, SR shall
shall initiate hazard and risk
assessment / analysis and consultations with Safety Committee to deploy
appropriate remedial measures and improved operation control procedures.
Periodic inspection reports and proposed remedial measures shall be submitted
to the
he Employer. Records of changes in processes; consultations with Safety
Committee and revision of Operational controls shall all constitute objective
evidence of the existence of established procedures.
1.14 Safety Audits
a) Contractor shall undertake periodic ssafetyafety audits to confirm through

investigative methods the effectiveness of the measures set out in the Safety
Policy. In order to be effective such safety audit shall be comprehensively
covering all aspects detailed in this specification to ensure effective
effectiv Loss-
control / accident prevention programme. Safety audits shall take into account
the safety inspection records, remedial measures and effectiveness of the safety
programme. Effectiveness of safety Programme shall be based on Contractor’s
effective Hazard
ard identification and risk assessment processes for design of
Operation control procedures and on the safety statistics. Audit reports and
preventive actions and Safety Improvement programmes shall be submitted to
Employer.
87
b) Employer shall retain his righ

rightt to audit Contractor’s Safety management
System either directly by his Employees or his nominated representatives for
its effectiveness.
2.0 EQUIPMENT AND SUBSTA

SUBSTANCES
NCES AND PERSONAL SAFE-
SA
GUARDING
2.1 Mechanical
echanical Safety
a) Contractor shall ensure that all his equipmen

equipmentt and machinery are safe to use
while in motion or working. Operators shall have received training or
instruction on operation of the machinery and the regulatory requirements.
Contractor shall have adequate procedure to ensure the stability and securing
off his working machinery during operation. He shall restrict repair and
maintenance of the machinery to trained personnel and maintain records of
repairs and maintenance. The equipment shall have appropriately designed
means of isolating from sources of ene energy
rgy and shall have emergency stop
control, which is easily accessible. All controls shall be clearly and uniformly
marked. All operation controls, interlocks, sensing devices and guards on tools
and equipment shall be functional and their status shall be regularly
regularly checked
and recorded. Contractor shall provide evidence of compliance to these
requirements in any contractual write
write-ups
ups submitted to Employer / Engineer
for approval in respect of critical construction / contract works.
b) Contractor shall provide only good quality handtools and ensure control of
condition, storage, routine inspection and use of such hand-tools.
hand tools. Unsafe tools
such as with cracked or broken handles, mushroomed chisels and punches,
worn screwdrivers, hardened hammerheads; power tools withwith unsafe resistance
to earth or without safety guards shall be prohibited.
c) All safety ladders, scaffolding and access equipment shall meet requirements of
IS 3696 and IS 4014:1967 and any such standards that the Employer / Engineer
may stipulate. The safety
safety work permits shall be issued only after ensuring that
all safety requirements of access equipment are complied with. Access
equipment shall be inspected on a routine basis to prevent injuries caused by
falls.
d) Contractor shall ensure safety of all th

those
ose concerned with lifting and those who
may be affected by material hoisting, lifting and handling using various
mechanical aids. All lifting equipment such as cranes, hoists, lifting shackles,
hooks chains and links shall be designed as per appropriate IInternational
nternational codes
of construction. Operators shall have been trained in operation and
maintenance of such equipment besides training on standard hand signals to be
employed during the hoisting and lifting operations. Safe working loads (SWL)
shall be marked
ed on equipment prominently. SWL shall be evidenced to have
been established by test procedures in accordance with acceptable codes of
practices.
e) Riding on construction equipment, forklifts and cranes shall be prohibited

unless such vehicles are provided with passenger seats.
88
f) Signs, barricades, barrier tapes and warning or entry restriction devices or

accessories shall be provided to minimise work related risks of accidents and
injuries. Signage shall meet all regulatory requirements such as The Building
and other Construction Workers Act 1996, Factory Act 1948, Manufacture,
Storage, Import of Hazardous Chemicals Rules under Environmental
Protection Act 1986, Indian Explosives Act 1984 and Gas Cylinder Rules 1981
and Indian Electricity Act 1910 and Rules there of and any other safety
requirements of Employer / Engineer, as applicable.
2.2 Electrical equipment - Safety
a) Contractor shall provide only such equipment for work that is electrically safe
to work. Contractor shall have a procedure to identify and recordrec all his
electrical equipment in a register, with provisions to record his periodic
inspections of such equipment. Inspection shall cover cables, extension leads,
all electrical equipment drawing power from socket outlet. He shall identify
and maintain in good working order all electrical installations such as
distribution panels and major switchgear ensuring safe accessibility. A clear
area shall be maintained around Panels and switchgear. The installed
equipment shall be periodically inspected by qualified
qualified personnel to ensure their
continued safe operating condition. Inspection shall include earth polarity
checks, continuity checks and earth resistance checks. Contractor shall ensure
use of flameproof and explosion proof switchgear and lighting fittings where
required as per governing codes.
b) Approved earth leakage relays or alternative safety devices to relevant

IS/International codes shall be used on all portable electrical hand tools. Where
possible low-voltage
voltage electric power supply shall be used for handtools. Earth
leakage units shall protect electrical installations in storeroom, pantry, transit
rest room, Office / Record room, switchgear rooms, control room and battery
room. Record of regular checks shall be maintained. Contractor shall comply
with "Code of practice for earthing" as per IS 3043:1987.
c) Safety rubber matting of appropriate voltage rating conforming to IS

5424:1969 titled "Rubber mats for electrical purposes" shall be provided in
front of all switchgear and power distribution panels fo
forr the safety of personnel
operating such equipment.
d) Contractor shall arrange displaying signages under Indian Electricity Act 1910,
such as :
i Danger notices as per IS 2551 in conspicuous places on all low, medium

and high voltage installations as per Rul
Rule 35,
ii Instruction of restoration of persons suffering from electric shock in
English and local languages as per Rule 44 in switchgear rooms,
substations and places where electricity is used and
iii Notice prohibiting unauthorised entry in areas where electrical
electrica apparatus
are used.
e) All power cables providing construction power to various constructions

machinery and the connectors shall be in safe and sound condition. Cables
89
shall be routed through cable trays supported on appropriately designed

structures, duly clamped, secured and identified. Road crossing cables shall be
laid in conduits buried at least 600 mm below the surface to prevent damage
due to vehicular traffic. All cables shall be off the floor to avoid damage or
tripping hazard. Cables shall be term
terminated
inated at the switchgear and sockets in a
workman-like
like manner to prevent loose contacts and flashover. Only safety
receptacles shall be used for providing power connection to hand-tools.
hand All
switches and distribution boards shall be clearly marked. All electrical
ele
distribution and panel wiring diagrams shall be available with the electrical
maintenance personnel. Contractor shall maintain a safe electrical isolation /
lockout procedure.
f) Contractor shall ensure lighting circuits are not used for hand
hand-tools. No
electrical equipment shall be overloaded. Tools and test equipment used on
electrical systems shall be insulated.
2.3 Substances abuse plan
The contractor is encouraged to have a "substance abuse programme", and pre-

pre
employment drug testing. Drinking duri during
ng working hours shall be strictly
prohibited. Contractor shall promote through poster and other publicity,
awareness on abuse of substances such as alcohol and such depressant drugs
that slows the activity of brain and spinal cord on abusive usage endange
endangering
the safety and health of users and others affected by their work.
2.4 Hazardous substances control
a) Contractor shall prevent all injuries, illnesses and damage to property or the
environment caused by any article or substance, which proves to be hazardous.
hazardou
The code of practices of construction, operation, maintenance and control
procedures shall meet required statutory and regulatory requirements.
Personnel shall be trained on use, handling, storage and disposal of emergency
spillage procedures.
b) Contractor
or shall detail and deploy Operational controls to reduce hazardous
wastes and their disposal as required by the statute “ Hazardous Waste
(Management and handling) Rules 2000”. Oil wastes, used oils, soil and cotton
soaked in oil consequent to handling operations,
operations, grease, many class of paints,
asbestos sheets and gaskets are typical hazardous wastes.
3.0 PERSONAL SAFGUARDING
3.1 Personal protection equipment (PPE):

( general
Contractor shall provide his employees required PPE meeting the requirements
of the statedd IS Specifications and Guidelines or equivalent International
Standards as may be prescribed by the Engineer from time to time. Contractor
shall have instituted good working procedures and practices in providing PPE,
maintenance, issue and training on the
their
ir use. All PPE shall be periodically
checked to ensure worn so that damaged equipment are replaced expeditiously.
90
a) Control of use of issue, use and maintenance of PPE:
Employees shall be responsible for PPE issued to them. Contractor shall meet
requirements
ents of IS 8519: 1977 titled “Guide for selection of Industrial safety
equipment for body protection” or any equivalent International Specification
that the Employer / Engineer may prescribe.
b) Head Protection:
Contractor shall comply with requirements as per IS 2925. It is mandatory for

the contractor to provide safety helmets to all the persons working at the site.
c) Eye and face protection

protection:
Eye protection shall be worn during all operations by operators and people in
the vicinity, where there is a danger
danger of flying particles of metal such as
generated during use of hand tools such as chisels, grinding, welding and
cutting lathe work on brass and cast iron acid and alkali splash, and high
pressure jet cleaning or insulation removal from heights using high pressure
jets. Contractor shall meet the requirements of IS 8540:1978 titled ”Guide for
selection of Industrial safety equipment for eye and face protection".
d) Footwear:
Safety shoes boots and gumboots fitted with steel toecaps of approved quality
conforming
ing to prescribed Indian or International standards shall be used.
Wearing of unsafe safety shoes such as jogging shoes, tennis shoes, slippers
and sandal etc. shall be prohibited. Contractor shall meet the requirements of IS
10667:1983 titled ”Guide for sselection
election of Industrial safety equipment for
protection of foot and leg".
e) Protective clothing
clothing:
Contractor shall prevent hazards of loose clothes worn by workmen getting

caught in moving machine parts. Loose and thin garments such as Dhoti and
pyjamas shallll be prohibited. While Contractors shall ensure that all workmen
wear long sleeved shirts, jackets or the like with the sleeves rolled down and
secured at the cuff, long pants / trousers extending upto the top of the safety
shoes so as to prevent injuries caused by contact with heat, cold abrasive and
sharp surfaces shall be strictly enforced. Contractor shall meet the requirements
of IS 8990:1978 titled “maintenance and care of industrial safety clothing.”
f) Hand Protection:
Contractor shall provide appro

appropriate
priate hand gloves as per IS 8807:1978 titled:
”Safety equipment for protection of arms and hands” to prevent injuries to
hands during work. Contractor shall maintain appropriate inventory of gloves
for different applications like acid / alkali handling, general-
g -purpose work
gloves and asbestos or heat resistant hand gloves, etc.
g) Safety harness : Fall arrest :
91
Contractor shall provide safety harness or means of restraint such as safety

belts, harness and lifelines, etc to workmen engaged to work in heights
heigh such as
Open – sided Floors, Open-sided
Open sided scaffoldings, floor and roof openings,
overhead construction works of various nature, etc where there is a falling
hazard of six feet or above. Storage, issue wearing and maintenance of safety
harness shall be und
under
er strict supervision and records shall be maintained. All
fall arrests shall consist of full
full-body
body harnesses, lanyards with shock absorbers,
lifelines, rope grabs and associated hardware. Two alternate lanyards shall be
used to facilitate tying off at a newnew location before disconnecting from the
previous location’s of practices for safety harnesses and fall arrests shall
conform to IS 4912:1978, IS 11972:1987, IS 8519:1977 or equivalent
International codes.
h) Falling object protection

protection:
Where work is in prog

progress
ress in elevated areas; barricades, barrier tapes signs and
such entry restriction devices shall be used to keep area below clear of
personnel to prevent injury due to falling objects. If work is required in the area
below elevated work area, it shall be sscheduled
cheduled at a time different from
elevated works. The workmen below shall be protected from falling objects by
the debris net or a catch platform with an adequate toe board to prevent
material from falling off. Use of safety net for elevated works shall be
considered in the work-permits
work permits where appropriate. Where a lift is made above a
working area, the area below the path of the lift shall be cleared of personnel
during the lift and barricaded and guarded to prevent entry of persons generally
in conformity withith IS 4912, IS 11972 and IS 13416 for "protective barriers in
and around building and preventive measures against safety hazards in work
places and safety requirements for floor and wall opening, railings and toe toe-
boards".
i) Hearing conservation
conservation:
Contractorr shall ensure reasonable precautions are taken to avoid injury to the
hearing of the employee. All noise levels shall be controlled within 85 dBA.
Contractor shall identify noise areas where noise levels exceed prescribed safe
level for arranging for appropriate
appropriate Engineering revision. Where this is not
feasible, appropriate Earmuffs or protectors shall be provided to workmen
ensuring those wear them exposed to noise levels beyond safe levels. Periodic
hearing acuity tests shall be conducted on such persons exposed to high noise
levels to ensure that they do not suffer any hearing impairment` as per
requirements of IS 8520: 1977
3.2 Manual handling & ergonomics

ergonomics:
a) Contractor shall have procedures to identify risks involved in manual handling,

operation and tasks. He shall ensure appropriate training to prevent any
possible injury. Full use of mechanical aids shall be made to avoid risks arising
out of such manual handling. Employees shall be adequately trained on such
manual tasks and related safety precautions to reduce the risk of injury to
personnel engaged in such work.
92
b) Contractor shall undertake ergonomic study of manual operations to prevent

musculoskeletal injury during manual handling, besides visual fatigue and
mental stress giving considerations to matters
matters such as seating, lighting and
ventilation, etc.
4.0 FIRE PROTECTION AND PREVENTION:
4.1 General Requirements :
a) Risk assessments shall be carried out to identify potentially vulnerable areas to

provide sufficient quantities of correct type of extinguishers and an ancillary
equipment to deal with various types of fire hazards.
b) Where required by the contract, Contractor shall provide appropriate type of

extinguishers close to areas of fire hazard but not too close such that they are
cut off from use during a fire fire.. Water based extinguishers shall not be
positioned close to or used on electrical equipment.
c) Extinguishers shall be marked / labelled and recorded with location particulars

in a register. They shall be inspected at monthly intervals to ensure they are in
operable sound condition. There shall be a systematic plan for servicing,
repairing and recharging fire extinguishers and for recording such dates on the
register and equipment.
d) The location of fire fighting equipment shall quickly and easily be identifiable
identifi
especially in emergencies in a conspicuous manner painted as high as possible
to identify the location of the extinguisher to prevent it from being obscured by
machinery and goods stacked in front and to return the equipment to its
location after emergency
emergency use in other locations. In order to ensure this, "Keep
Clear" area shall be demarcated and maintained. Location plans of
extinguishers and fire
fire-fighting
fighting equipment shall be prominently displayed when
desired by the Employer.
e) SR and SA shall be traine

trained
d on fire fighting techniques who shall co-ordinate
co
and control fire protection and prevention programmes.
f) Where required by contract, Contractor shall maintain alarm systems powered

by mains and by battery for back up. Where required by the Contract,
emergency
rgency lighting shall be provided to aid evacuation in poor lighting
conditions following the alarm. The alarm system shall be made known to all
employees.
g) A clear written procedure for action in the event of fire should be produced.
Fire teams and Hose teams shall be identified and their responsibilities during
emergencies shall be detailed in writing. Personnel shall be trained on their fire
duties and use of fire-fighting
fire fighting equipment. Regular drills shall be conducted to
test procedures and to validate them.them. Fire instructions and emergency
procedures shall be displayed throughout the premises. Emergency response
procedures are detailed below under Clause 5.0.
93
h) A means of escape shall be provided in all work areas and storages and
maintained and kept free from obstruction. All exits shall be clearly marked
and kept unlocked whilst the premises are in use. Escape routes shall be
protected from fire.
4.2 Security :
a) Where required by the contract, Security shall do all that is reasonably

practicable to ensure ththee safety of employees and property of the company in
the face of accidents by fighting fires, and containing losses due to pilferage,
theft, vandalism and industrial espionage both by employees external elements.
Security personnel shall be appropriately ccompetent,
ompetent, receive adequate safety
training. Security shall routinely report on a standardised basis on aspects such
as violation of fire-protection
fire protection rules, use of alcohol and narcotic drugs,
condition of security fencing, floodlighting and storage, etc.
b) Where
ere the project is located where a number of other companies are in
operation, Contractor shall plan for mutual assistance programmes in cases of
emergencies, as are practiced in the area in conjunction with Employer.
c) Where common boundaries exist between companies, contractor in conjunction

with Employer shall co-ordinate
co ordinate security control over common factors such as
Floodlights, Fencing, and pipelines containing gas, fuel and electricity.
d) Security shall be represented in Safety committee through a safety appointee

nominated from the area.
5.0 EMERGENCY PLANNING / EMERGENCY RESPONSE (ER)

ER)
a) Contractor shall plan to deal with emergencies (ER) specific to the job site. ER
shall be written and communicated to all employees. ER shall identify for the
potential and responses to incidents and emergency situations and for
preventing and mitigating the likely illness and injury that may be associated
with them.
b) The Contractor shall review his emergency preparedness and response plans
and procedures in particular after occurrence of incidents or emergency
operations.
c) Contractor shall designate his emergency team with their duties during
emergencies defined, including those of the hose teams, medical personnel,
first-aiders
aiders and security. Contractor shall maintain a proce
procedure
dure as to how his
emergency organisation shall liaise with Employer's representatives in ER.
d) The Contractor shall also periodically test such emergency procedures by

conducting Mock
Mock-drills
drills and use the experience for updating the emergency
Plan and for training
aining the Employees on the perceived competence needs.
e) The emergency Response Plan of the Contractor shall be under the control of
the SR who shall be able to coco-ordinate
ordinate with Employer for liasing with
Government agencies, neighbouring industries and com
community
94
f) The plans shall be designed to allow people to work under disaster conditions
when normal services such as telephone, water, light, power, transport and
sanitation are not available and first aid and fire fighting facilities are not able
to cope with
ith sudden demand on services.
g) The telephone numbers, ambulance, Police; Managers and Employer's key

executives shall be prominently displayed in the identified Emergency
Response Centre.
6.0 PREMISES AND HOUSE –KEEPING
6.1 Orderly work-place

place
Contractor shall maintain a well

well-managed
managed safe working place in sound clean
condition. Contractor shall ensure that there is a place for everything and
everything is in its place so that optimum use is made of valuable floor space
with commensurate cleanliness and reduced handling
handling time. He shall ensure that
his entire infrastructure including temporary and semi-temporary
semi temporary buildings are
kept clean and have good repair.
6.2 Good lighting (natural and artificial)

artificial):
Contractors shall provide lighting (natural or artificial) to enabl

enable that work
processes are carried out safely. Artificial lighting shall be adequate especially
in the nights and emergencies. The lumen levels shall meet the statutory
requirements.
6.3 Ventilation (natural and artificial):
Contractor shall ensure that workp

workplaces
laces are ventilated with at least prescribed
amount of clean or cleaned fresh air of a suitable temperature, especially where
toxic or irritating substances are present such as welding, vehicle exhaust
fumes, irritating dusts, organic solvents or any otheotherr inimical atmosphere
creating health hazards or safety.
6.4 Welfare and hygiene facilities:
Contractor shall provide welfare facilities to ensure a high standard of

cleanliness for all activities and rest. Contractor shall provide adequate
facilities for hiss employees such as ablutions, toilets, change rooms, kitchens
and cafeterias in a clean and hygienic state.
6.5 Pollution to ground, air and water

water:
Contractor shall strive to exceed established minimum performance norms in

waste and pollution control. All drains
drains shall be identified as clean water and
foul water to aid non
non-armful disposal.
95
6.6 Traffic routes and Aisles

Aisles:
Contractor shall arrange to separate pedestrian and vehicular including material

handling equipment traffic wherever possible and maintain th thee routes clear of
obstruction. To ensure safety of user’s clear painted demarcation is encouraged
as a discipline to be enforced.
6.7 Stacking and storage practice

practice:
a) Contractor shall ensure stacked material is bonded on a stable and level footing
capable of carrying
arrying the mass of the stack. Adequate clearances shall be
provided between the sides of the stack and top to facilitate unimpeded access
to service equipment like overhead wiring, cranes, forklifts, fire fighting
equipment and hoses. Circular items shall be sufficiently choked with wedges
and not with odd bits of materials. Freestanding stacks of gunny bags and sacks
such as cement bags shall be stacked to prescribed safe-stack
safe stack heights with
layers formed for stable bonding, preventing slippage causing accidents.
acc
Stacking against walls shall not be permissible.
b) Contractor shall maintain the premises and surrounding areas in clean and clear
manner with safe access and egress. There shall be sufficient and adequate
storage racks, shelving, bins, pallets and material handling equipment to stack
his construction materials such as pipes, structures and his construction
enabling materials. Unwanted materials shall be promptly moved away for
efficient material movement.
6.8 Storage of Hazardous materials

materials:
a) Hazardous materials shall be stored on solid bases. Solid bases shall include
compacted earth, pallets, concrete or asphalt platforms or paving. Hazardous
materials shall be stored, stacked and secured to prevent toppling, spillage or
other unintended dislodgement. Aisles and clearances shall be as detailed under
6.6 above. Hazardous materials shall be stacked in such a manner that an
observer standing in the aisle can read their labels and legends
b) Each hazardous material contained hall be identified by a legible or legend as

per governing statute, code or regulation. The label shall identify the item,
quantity and appropriate warnings.
c) Hazardous materials which if brought in contact with each other could react or
pose equal or greater hazard than either material stored
stored alone shall be stored at
a distance not lesser than twenty feet apart.
d) Warnings shall be posted and maintained in a legible condition at all access

points clearly defining the specific hazardous nature of the stored materials
such as "Corrosive", Flammable",
Flammable", "Explosive", “Oxidising", "Compressed
gas" or other hazardous nature.
e) Where hazardous materials are unloaded in Contractor's storage maintained at

site in a semi-permanent
permanent installation, such installations shall be approved by
relevant statutory bodies. Copies of licences for storage shall be lodged with
96
Employer. The Containers and storages shall display quantities stored with
name of the hazardous material and the UN Hazard classification label in
prescribed colour code prominently painted in a conspicuous manner.
f) Contractor shall inspect the hazardous storages and installations on a daily

basis and hall undertake any requisite preventive action necessary to avoid
safety risks
6.9 Storage of flammable / explosive Materials:

Materials
a) Contractor shall secur

securee flammable and / or explosive materials against
accidental ignition.
b) Storage facilities for flammable liquids such as Petrol, Diesel, Kerosene and
Lubricants as well as the quantities stored shall meet the legal and statutory
requirements. They shall be stored in approved fire-resistant
resistant rooms with a
sump of sufficient volume to contain any spillage.
c) The electrical fittings shall be flame -proof

proof and on a strict maintenance
schedule.
d) Containers shall be appropriately bonded in receptacles into which low flash

f
point fuel is decanted.
6.10 Compressed gas cylinders
Compressed gas cylinders shall be stored and secured in the upright position at
safe distances shielded from welding and cutting operations. Compressed gas
cylinders in storage shall be shut off and torches,
torches, hose and manifolds removed
and capped. Cylinders shall be periodically checked for leakages. Storage shall
meet requirements of Gas Cylinder Rules 1981. Compressed gas storages shall
be provided with safety relief valves, safety valves and rupture disc to protect
them from overpressures and shall be appropriately designed to ensure their
continued availability in the face of process changes.
6.11 Scrap and Refuse Bins-Removal

Bins System
Contractor shall ensure that he has sufficient waste bins that are identified
ide for
different wastes and maintained in clearly demarcated areas. Wastes with oily
or other ignitable materials such as Oily cotton wastes and Hand gloves shall
be stored separately with covers to prevent fires and shall be made of metal.
Different Wastes shall be segregated and stored separately and disposed off.
They shall be emptied at routine intervals to prevent that they do not overflow
with wastes.
97
Section VI - G – List of Approved makes
1.1.0 Power Transformer
1.1.1 Crompton Greaves Mumbai

1.1.2 Telk Ernakulam
1.1.3 Schneider (Areva) Naini
1.1.4 ABB Vadodara
1.1.5 Bharat Bijlee Mumbai
1.1.6 BHEL Bhopal
1.1.7 Voltamps Transformers Ltd. Vadodara
1.1.8 Siemens Ltd. Mumbai
1.1.9 Kanohar Transformers Meerut
1. 2.0 Distribution Transfor

Transformer
1.2.1 Crompton Greaves Mumbai

1.2.2 Kotsons Limited Agra
1.2.3 Indcoil limited Mumbai
1.2.4 Marsons limited Agra
1.2.5 Kanohar Transformers Meerut
1.2.6 NEEK Nepal
1.2.7 Necon Switchgears Punjab
1.2.8 Uttam (Bharat) Electrical
Elec Jaipur
1.2.9 Kirloskar Electric Company Bangalore
2.0 33 kV and 11 kV circuit breakers
2.1 ABB Vadodara

2.2 Schneider (Areva) Kolkatta
2.3 Siemens Mumbai
2.4 Pascal switchcare India Pvt. Ltd Kolkatta
2.5 Crompton Greaves Nasik
2.6 Jyoti Ltd. Vadodara
2.7 BHEL Bhopal
3.0 Lightning Arresters.
3.1 Elpro International Mumbai

3.2 Oblum Electrical Hyderabad
3.3 W.S. Industries Chennai
3.4 BHEL Bhopal
3.5 Crompton Greaves Nasik
4.0 Current/Potential Transformers/ CVTs
4.1 Crompton Greaves Mumbai

4.2 ABB Vadodara
4.3 Mehru Electricals Mumbai
4.4 Schneider (Areva) Bangalore
4.5 BHEL Mumbai
98
4.6 CGL Arungabad
5.0 Relays
5.1 Schneider (Areva) Kolkatta

5.2 ABB Mumbai
5.3 Siemens Mumbai
5.4 Easun Reyrolle Hosur
6.0 LT and Control cables
6.1 Asian Cable Corpor

Corporation Mumbai
6.2 Cables Corporation of India Mumbai
6.3 Universal Cables Mumbai
6.4 Finolex Cables Pune
6.5 Polycab Industries Mumbai
6.6 KEI Rajastan
6.7 HVPL Delhi
6.8 Delton cables Ltd. Delhi
6.9 NICCO Corporation Ltd. Kolkata
6.10 KEI Industries Ltd. New Delhi
6.11 Paramount Cables New Delhi
6.12 Prew Cables New Delhi
6.13 Insucon Cables India
6.14 Havells India India
6.15 Apar Industries India
7.0 HV Cables
7.1 Asian Cable Mumbai

7.2 Cables Corporation
ration of India Mumbai
7.3 Universal Cables Mumbai
7.4 HVPL Delhi
7.5 Fort Gloster Inducstries Ltd. Kolkata
7.6 KEI Industries Ltd. New Delhi
7.7 Havells India India
7.8 Apar Industries India
8.0 AC & DC Distribution Boards
8.1 Controls & Switchgear Co Delhi

8.2 Pecon Engineering Kolkota
8.3 Continental Engineering Lucknow
8.4 Control and Protection Kolkota
8.5 L&T Ltd. Mumbai
8.6 Vikas Lucknow
8.7 Sarvana Bangalore
9.0 Substation Structures
9.1 RPG Transmission Delhi
99
9.2 L&T Mumbai

9.3 Jyoti Structures Mumbai
9.4 Amitava Structures Nagpur
9.5 Advance Steel Delhi
9.6 Mann Structural Jaipur
9.7 Skipper Steel Howard, WB
9.8 Swastika Steel & Allied products Howard, WB
9.10 Bhutan Rolling Mills Pasakha
9.11 Druk and Iron Steel (Karma TMT) Phuentsholing
uentsholing
10.0 Multi Function Meters/Meters
10.1 Automatic Electric Mumbai

10.2 ABB Mumbai
10.3 Industrial Meters Mumbai
10.4 Secure Meters Jaipur
10.5 Enercon Delhi
10.7 Schnieder Delhi
10.8 L&T Bangalore
11.0 Substation
ubstation Hardware Fittings
11.1 Tyco Electronics (Dulmison) India

11.2 Exalt Engg. Mumbai
11.3 Sicamex France
11.4 Supreme Kolkota
11.5 IAC Electrical Kolkota
11.6 Rashtriy Udyog Kolkata
11.7 Indo Asiatic Corporation Kolkata
11.8 Tag Corporation Ltd. Chennai
12.0 Insulators & Bushing

Bushings
12.1 BHEL Bangalore

12.2 WS Insulators Chennai
12.3 NGK Jayshree Kolkota
12.4 Modern Insulators India
12.5 Aditya Birla India
12.6 Allied Ceramics India
13 Ventilation Fan
13.1 Alstom India

13.2 Crompton Greaves India
14 Portable Fire Extingui

Extinguishers
14.1 Steelage (Minimax) Mumbai

14.2 Nitin India
14.3 Vijay Fire Mumbai
100
15.0 Battery
15.1 Chloride Industries Limited Kolkota

15.2 Amar Raja Batteries Limited Kolkata
15.3 Exide Limited Mumbai
15.4 Standard Batteries Mumbai
15.5 Bharat Cutler Hammer New Delhi
15.6 Automatic Electric Munbai
15.7 Chabi Electricals Mumbai
16.0 Battery Charger
16.1 Automatic Electric Mumbai

16.2 Mass Tech Controls (p) Limited Mumbai
16.3 Chabbi Electricals Limited Mumbai
16.4 Exide Limited Kolkota
16.6 Electro Service
ervice (India) Kolkota
16.7 Amar Raja Batteries Limited Kolkata
17.0 Civil Works
17.1 Doors Closure, Floor Spring: Doorking, Everite, Acme

Acme-4C
17.2 Ceramic Tiles: Kajaria, Spartek, Nitco, Somany
17.3 Glazed Tiles: Somany, Kajaria, Johnson
17.4 Aluminium Sections:
ections: Indal, Hindalco, Jindal
17.5 Clear Float Glass/Toughened Glass: Modiguard
17.6 Pre-laminated
laminated Particle Board: Bhutan Board, Green Wood
17.7. Door Shutters: Novapan, Kitlam, Sitapur
17.8. Laminates: Neoluxe, Decolam, Formica
17.9. Plastic Emulsion, Synthetic Enamel & Other paints :Nerolac, ICI-Dulux,
ICI
Shalimar
17.10. Cement Paint: Super Snowcem, Shalimar
17.11. Water Proofing Material: Cico,Killic Nixon,Pidilite,STP Ltd.
17.12. Integral Cement based water proofing: Overseas Water Proofing, Roofer India.
Indi
17.13. Reinforced Steel: Tisco, Sail, IISCO
17.14. Cement (PPC): L&T, ACC, JK,CCI, Penden
17.15. Silicon Sealent: Pidilite, Wacker
17.16. Isothanc Elastomeric Membrane: Liayd Insulation, STP Ltd.
17.17. Texture Paint: Spectrum
17.18. Cement Bonded Particle
Parti Board: Bison
17.19. Roofing Sheet : Tata, SAIL
18.0 Plumbing Works
18.1. Vitreous China Sanitary Ware: Payrryware, Hindustan Saitary Ware, Neycer,
Cera
18.2. White Glazed Fire Caly Sink: Sanfire Cera, Neycer
18.3. Stainless Steel Sink: AMC, Orient, Sunag
18.4. Plastic Seat Cover of WC: Commander, Bestolite, Diplomat
18.5. Geyser: Venus Spash, Usha Lexus
18.6. CP fittings mixers, Piller taps Washer: Gem, Parko Kingston
101
18.7 Sand Cast Iron Pipes & fittings: RIF, NECO, BIC
18.8 GI Pipes & MS Pipe: GST,
G Jindal, Kalinga, Tata, Bansal, Imperial
18.9. GI fittings: Kohhi, VI, Umk, MAC
18.10 Gunmetal Valves:Zoloto Leaser, Sant, Kohhi.
18.11. Brass stop & Bib cocks: Zalato, Sant, L&K
18. 12 Ball valve with float: Zaloto Leader, Sant
18.13 Stoneware pipes & Gully traps: Perfect, Burn Hind
18.14 RCC Pipes: IS marked pipes
18.15 CI Manhole Cover: RIF, NECO, BIC
18.76 Water Tank: Sintax, Polycon, Uniplas
18.17 Mirror Golden fish, Atul Jolly, Modi
18.18 Teak Ply/Commercial: National, Kitply, Novapan, Bhutan
18.19 Mosaic Tiles: Nitco
18.20 Locks: Godrej, Harison, Acme-4C(25mm)
Acme
18.21 Flooring & Wall Tiles: Somany, Argil, Kajaria
19.0 Electrical and Wiring Materials
19.1. Lamps: Bajaj, Philips, GE, Osram, Crompton

19.2. Fluorescent lamps, CFL’s: Bajaj, Phi
Philips, GE, Osram, Crompton
19.3 Mercury Vapour, Sodium Vapour lamps, Halogen lamps: Philips, GE, Bajaj,
Orsam.
19.4 Luminaires/ fixtures: Bajaj, Philips, Compton, GE.
19.5 Switch & Sockets: Anchor Roma/Rider/woods, NorthWest, Crabtree, LK Fuga
19.6 MCB’s: GE, Siemens, MDS Legrand, Havels
19.7 Wires: Finolex, Havells, Royal Cables, V V-guard.
20 Cable Terminations: MSeal, Yamuna Power Technologies, Compaq

International and Raychem.
21 UPS: Aplab, Emerson Power System, Hirel electronics, Eneron system.
22 Air Conditioners:
ioners: Blue Star, Electrolux, Carrier, Hitachi
23 Note: All the material supplied in this contract shall be Class A materials and
shall be delivered to the site after the proper testing/approval of the samples
in case of civil works materials.
102
Section
tion VI - H – Bid Purpose Drawings
103
LEGEND
SYMBOLS
FIG. INDICATES NO. OF CTs/VTs
VOLTAGE TRANSFORMER
R-RELAYING
CURRENT TRANSFORMER I-INSTRUMENTATION
CIRCUIT BREAKER
INSOLATOR
LIGHTNING ARRESTER
FUSE (THICK LINE INDICATES SUPPLY SIDE)
HT HRC FUSE
DPH-I, THIMPHU 33/11kV substation AUTO-RECLOSER CIRCUIT BREAKER
LBS WITH HT HRC FUSE
GANG OPERATED AIR BREAK SWITCH

G/O
TWO WINDING TRANSFORMER
SOURCE (GENERATOR)
11 kV Incomer 1 11 kV Incomer 2 11 kV Incomer 3 11 kV Incomer 4 RELAYING

(220 kV SS Feeder No. 5) (220 kV SS Feeder No. 1) (From DG Set) (From 33 / 11 kV SS) 50 INSTANTANEOUS O/C RELAY
CTR - 600-300/1-1A CTR - 300-150/1-1A CTR - 300-150/1-1A CTR - 300-150/1-1A
51 INVERSE TIME PHASE OVERCURRENT RELAY
REF RESTRICTED EARTH FAULT RELAY
M.F. METER M.F. METER M.F. METER M.F. METER

1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH INSTRUMENTATION
Metering Metering Metering
3 3 Metering
3 3 A AMMETER
3 3 3 3
R 50/51 R 50/51 R 50/51 R 50/51 V VOLT METER
Protection Protection Protection Protection
3 3 3 3 W WATT METER
VAR VAR METER
3 3 3 3 3 3 VS VOLT METER SELESTOR SWITCH
3 3
1 1 1 F FREQUENCY METER
1
Line Voltage Transformer Line Voltage Transformer PF POWER FACTOR METER
Line Voltage Transformer
V, 50VA V, 50VA V, 50VA kWh ENERGY METER
V, 50VA
MFM MULTI FUNCTION METER
11KV BUS COUPLER 11KV BUS -II

11KV BUS -I
BUS PT
BUS PT
3
HT Fuses
3 VCB VCB VCB HT Fuses
VCB
3
Bus Voltage Transformer 3 Bus Voltage Transformer
M.F. METER M.F. METER M.F. METER M.F. METER V, 30VA
V, 30VA
1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH
Metering 3 3 3
3 3 3 3
MFM 1 3 1 V W VAR PF kWh F
R 50/51 R 50/51 R 50/51 R 50/51
Protection 3 3 3 3
Out-going -09
Out-going -01 Out-going -02
Out-going -03 (Sunday Market Feeder)
(RBP - I) (Trade Industry)
(SAARC Feeder) CTR - 300-150/1-1A
CTR - 300-150/1-1A CTR - 300-150/1-1A
CTR - 300-150/1-1A
Note:
THIS SCHEMATIC IS NOT MEANT TO BE A DETAILED
SPECIFICATION OF THE SUBSTATION. IT IS FOR
ILLUSTRATION PURPOSE ONLY.
NOTE: Title: File Name: Date: Scale:

PROPOSED SCHEMATIC FOR THE 11 KV PANELS AT DPH - I (DG ROOM), THIMPHU. BPC/DS/DCD/ED/C-10/F-3 December 2021 NTS
Project:
DPH - I (DG Room) THIMPHU Division:
Electrification Division
Code:
Electricity Services Division Bhutan Power Corporation Limited Distribution Construction Department
THIMPHU
LEGEND
SYMBOLS
FIG. INDICATES NO. OF CTs/VTs
VOLTAGE TRANSFORMER
R-RELAYING
CURRENT TRANSFORMER I-INSTRUMENTATION
DPH-II, THIMPHU 33/11kV substation CIRCUIT BREAKER
INSOLATOR
LIGHTNING ARRESTER
33kV Incomer - 1 33kV Incomer - 2 FUSE (THICK LINE INDICATES SUPPLY SIDE)
(From Olakha Substation) (From RICB Substation)

Panel no. Panel No. HT HRC FUSE
AUTO-RECLOSER CIRCUIT BREAKER

Line Voltage Transformer Line Voltage Transformer
HT Fuses
V, 30VA V, 30VA LBS WITH HT HRC FUSE
GANG OPERATED AIR BREAK SWITCH

G/O
TWO WINDING TRANSFORMER

1 V W VAR PF kWh F 1 V W VAR PF kWh F
33kV VCB 33kV VCB
SOURCE (GENERATOR)
33 kV Incomer & RELAYING

Buscoupler Feeder 50 INSTANTANEOUS O/C RELAY
51 INVERSE TIME PHASE OVERCURRENT RELAY
(CTR - 600-300/1-1A REF RESTRICTED EARTH FAULT RELAY
3
R 50/51 R 50/51 INSTRUMENTATION
Protection Protection A AMMETER
3 3 V VOLT METER
M.F. METER M.F. METER W WATT METER
VAR VAR METER
1 A,KW,KVA,PF,KWH 1 A,KW,KVA,PF,KWH
Metering 3 Metering 3 VS VOLT METER SELESTOR SWITCH
F FREQUENCY METER
PF POWER FACTOR METER
33KV BUS -I 33KV BUS -II kWh ENERGY METER
MFM MULTI FUNCTION METER
BUS PT
BUS PT
3 3 HT Fuses
HT Fuses
33kV VCB 33kV VCB
Bus Voltage Transformer 3 3 Bus Voltage Transformer
3 3
R 87, 50, 51 ... R 87, 50, 51 ...
V, 30VA Protection V, 30VA
33 kV Transformer Protection
3 3
3 Feeder 3
MFM 1 1 A W kWh 1 A W kWh 1 V W VAR PF kWh F
Metering 3 (CTR - 300-150/1-1-1A Metering 3
PS
R 86/87 R 86/87
3 PS
3
TRANSFORMER TRANSFORMER
2.5 MVA 5 MVA
33/11KV 33/11KV Note:
1 1 THIS SCHEMATIC IS NOT MEANT TO BE A DETAILED
51N SPECIFICATION OF THE SUBSTATION. IT IS FOR
51N ILLUSTRATION PURPOSE ONLY.
NOTE: Title: File Name: Date: Scale:

PROPOSED SCHEMATIC FOR THE 33 KV GIS PANELS AT DPH - II, THIMPHU. BPC/DS/DCD/ED/C-10/F-3 May 2020 NTS
Project:
DPH - II, THIMPHU Division:
Electrification Division
Code:
Electricity Services Division Bhutan Power Corporation Limited Distribution Construction Department
THIMPHU

Section VI Technical Specification

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SECTION VI – TECHNICAL SPECIFICATIONS

Clause No. Description

SECTION VI - A TECHNICAL REQUIREMENTS -GENERAL

SECTION VI - B TECHNICAL SPECIFICATIONS (Electrical)

SECTION VI - C TECHNICAL SPECIFICATIONS (Civil)

SECTION VI - D INSTALLATION, TESTING AND COMISSIONING

SECTION VI - E DRAWINGS, TEST CERTIFICATES & O&M

SECTION VI - F CONTRACTOR’S SAFETY PROGRAM

SECTION VI - H LIST OF APPROVED MAKES

Section IV – Technical Specification

Clause No. Description

SECTION VI - A TECHNICAL REQUIREMENTS – GENERAL

1.1 Project Description

Section IV – Technical Specification

1.1 Project Description

Bhutan Power Corporation Limited (BPC) intends to upgrade the following

a. Replacement of VCB panels for DPH-I & II Substations

b. Up-grade 0.415/11 kV, 2x1.6 MVA to 2X2 MVA, Step-up Transformer

1.2 Format of Specification

This specification describes equipment required in the project summarized in

Brief Description Major works

1.3 Scope of Work

The Contract includes the manufacture, testing at manufacturer's works,

The quantities given are estimated quantities. It should be clearly understood

Section IV – Technical Specification

Metric units of measurement (System International) shall be used in all

1.6 International Standards

1.7 Site Conditions

The elevation above sea level is 2400 m at Thimphu.

1.7.2 Special Conditions

Particular problems, which shall receive special consideration, relate to

DPH-I & II (Changzamtog) is accessible from Phuentsholing, Bhutan by road.

1.8 Electrical Characteristics

1.8.1 Design Features for 33 kV, 11 kV and 415 V Equipment

Nominal system Voltage 33kV 11 kV 11 kV 415 V

Location Indoor Outdoor Indoor Indoor

System neutral earthing Solidly Solidly earthed Solidly Solidly

Minimum Clearances in air

Ph-Ph spacing for Bus-mm - 1200 - -

Creepage distance mm N/A 25 mm / kV N/A

Equipment suitable for 1500 350 350 55kA

1.8.2 Creepage Distance

The creepage distance shall not be less than 25 mm/kV.

1.9 Spare Parts, Tools and Appliances

1.10 Electrical Power Supplies

i. 415 V, 3 phase, 4-wire, 50 Hz for power.

b) Miniature Circuit Breakers

Means shall be provided for protection and isolation of circuits

Miniature circuit breakers shall be of the thermal and magnetic tripping

All indicating and recording instruments shall be digital type, flush

The size of all indicating instruments shall be 96 mm square with long

Moulding materials shall be self-extinguishing or resistant to flame

All terminals shall be mounted in accessible positions. Adjacent

Terminal blocks for CT and VT secondary leads shall be provided with

Terminations for circuits operating at Voltages greater than 60 V shall

DC circuit terminals shall be segregated from AC terminals.

The wiring shall be bound and supported by clamping, roughing or

f) Wire Colour Code

Wire colours shall be as follows: