Esb National Code of Practice

National Code of Practice at Customer Interface Modification Log
Date of modification Page Nature of modification

Number
09-07-2008 50 Meter enclosure size modified to 600x400x200 added ref to pVII (b)
CONTENTS
CONTENTS ..................................................................................................................................................I - II
FOREWORD ....................................................................................................................................................III
SITE SAFETY....................................................................................................................................................IV
ESB NETWORKS INVOLVEMENT IN THE COMPLETION CERT PROCESS ....................V - VI
GENERAL REQUIREMENTS..........................................................................................................VII - XIII
KEY SAFE ......................................................................................................................................................XIV
SYMBOLS (symbols used, colour code.)................................................................................................XV
OUTDOOR METERING CABINET ............................................................................................................1
SERVICE ALTERATION ................................................................................................................................2
SINGLE UNDERGROUND SERVICE CONNECTED TO OVERHEAD NETWORK ....................3
OUTDOOR BOX LAYOUT/TYPICAL LOCATION ..................................................................................4
DOMESTIC STANDARD SETUP separate Meter and Isolator ............................................................5
DOMESTIC STANDARD SETUP combined Meter and Isolator..........................................................6
DOMESTIC PLUS STORAGE HEATING (Separate NSH Meter)......................................................7
DOMESTIC – DAY/NIGHT (plus up to 8KW switching through contactor) ....................................8
DOMESTIC – DAY/NIGHT (direct switching up to 13KW NSH) ....................................................9
DOMESTIC – DAY/NIGHT (switching through contactor up to 13KW NSH) ............................10
DOMESTIC OR COMMERCIAL WITH NSH LOADS IN EXCESS OF 13kW
(3 phase connection not available) ..........................................................................................................11
DOMESTIC OR COMMERCIAL WITH NSH LOADS IN EXCESS OF 13kW
(3 phase connection available) ..................................................................................................................12
CONNECTION CHECKLIST ....................................................................................................................13
ASSEMBLER'S CHECKLIST ..............................................................................................................14-16
FUSES BEFORE WHOLE CURRENT METERS IN MULTI-METERING
INSTALLATIONS (photos) ..........................................................................................................................17
FUSES BEFORE CT METERS IN MULTI-METERING INSTALLATIONS (photo)....................18
REQUIREMENTS FOR FRONT LOADING FUSE UNITS ..............................................................19
USEFUL GENERAL DIMENSIONS (CT Cabinet Incorporated in Main panel)............................20
USEFUL GENERAL DIMENSIONS (For Cabinets/Boxes) ..............................................................21
USEFUL GENERAL DIMENSIONS (For Multimetering panels) ......................................................22
USEFUL GENERAL DIMENSIONS (Space required for ESB Networks Cable Terminations)23
USEFUL GENERAL DIMENSIONS (Stand alone CT Enclosure) ..................................................24
USEFUL GENERAL DIMENSIONS (CT Connections 250/5A and 600/5A ) ............................25
USEFUL GENERAL DIMENSIONS (CT Connections 1500/5A) ..................................................26
Latest code @
http://www.esb.ie/esbnetworks/ncp
Page I
CONTENTS
DOMESTIC PLUS NSH ..................................................................................................................27
APARTMENTS DAY/NIGHT ELECTRONIC METERING FROM 2008 ..............................28
RELAY CONTROL DIAGRAM (Not for new installations) ......................................................29
COMMERCIAL/INDUSTRIAL PLUS SEPARATE NSH (multi-customer whole current) 30
PARTICULAR TO APARTMENT/OFFICE BLOCKS..................................................................31
ESB Networks MAIN CONNECTION FUSED UP TO 300A (arrangement for one
customer bulk tariff) ............................................................................................................................32
ESB Networks MAIN CONNECTION FUSED UP TO 300A (one customer multi-tariff) ..........33
CONNECTION OVER 300 AMPS (direct connection from sub station) ......................................34
CONNECTION OVER 300 AMPS (One customer) ............................................................................35
CONNECTION OVER 300 AMPS (photo, typical ESB Networks cable termination ) ..............36
CONNECTION OVER 300 AMPS (multi-customer)............................................................................37
ARRANGEMENTS FOR FIRE FIGHTING CONNECTION ..............................................................38
FIRE FIGHTING SAFETY LABELS (warning labels) ..........................................................................39
ESB Networks MAIN CONNECTION OVER 300A (single customer, wall mounted) ................40
SHOPPING CENTRES AND COMMERCIAL/INDUSTRIAL UNITS (general) ..........................41
SHOPPING CENTRES or COMMERCIAL/INDUSTRIAL UNITS (Centralised metering) ......42
COMMERCIAL/INDUSTRIAL UNITS (Alternative method ................................................................43
GROUPS OF SHOPS/OFFICES (facing onto public roadway) ......................................................44
CONNECTION FOR TEMPORARY INSTALLATION ..........................................................................45
PETROL STATIONS ......................................................................................................................................46
STAND-BY GENERATORS (Small connections - Manual Changeover) ........................................47
STAND-BY GENERATORS (larger connections - Auto changeover) ..............................................48
STAND-BY GENERATORS (multi customer) ........................................................................................49
AGRICULTURAL/HORTICULTURAL PREMISES (general)..............................................................50
REMOTE BUILDINGS ................................................................................................................................51
SPECIAL SITUATIONS (e.g. street furniture, Garda cameras/CCTV etc.) ..............................52-57
PUBLIC LIGHTING ................................................................................................................................58-62
REQUIREMENTS FOR CONNECTION AT MEDIUM VOLTAGE (MV) ................................63-69
ADDITIONAL USEFUL INFORMATION ................................................................................................70
SURFACE AND FLUSH MOUNTED METERING ENCLOSURE APPENDIX A-B
COMMERCIAL TEMPORARY SUPPLY APPENDIX C
MAIN OVERCURRENT DEVICE IN STANDARD METERING CABINET APPENDIX D
ESB NETWORKS CONTACT NUMBERS AND AREAS APPENDIX F-H
Latest code @ Page II

FOREWORD
This National Code of Practice for Customer Interface – 4th edition, 2008, replaces the
3rd edition.
The purpose of this National Code of Practice for Customer Interface is to have one
single interpretation of ESB Networks requirements.
It is a consensus document agreed between people involved in the electrical industry

and ESB Networks.
Contractors Associations, Consulting Engineers, Switchboard Assembler's, Electrical

Wholesalers, Distributors, Regulatory Bodies and ESB Networks staff made a very
positive contribution in the compiling of this Code.
It is important that everyone working at the ESB Networks/Customer Interface or

designing electrical equipment for that interface fully understands the Code and works
to it.
Each ESB Networks local office will provide details of who should be contacted
regarding queries, which may arise in the interpretation of this Code of Practice.
It is always essential to refer to the latest version of The National Code of practice at
SCOPE
The National Code of Practice for Customer Interface relates to situations where an
interface exists between the customer and ESB Networks at 230/400 volts and/or MV
exists.
The aim of the Code Book is to assist in achieving a single interpretation of the
requirements for metering/connection.
ESB Networks are fully supportive of ETCI, CER and the regulatory bodies in their
efforts to improve safety and standards of electrical installations.
ESB Networks recognise the need for and the importance of testing and certification of
all electrical installations.
Completion certificates are required for all new installations and alterations or extensions
to all existing installations. (See “ESB Networks involvement in Completion Certificate
Process” on page V and Vl.)
Latest code @ Page III

SITE SAFETY
• Be aware of your working environment and your responsibilities
to yourself and others.
• Contractors, Builders, Developers and ESB Networks must meet

all statutory requirements in order that site con ditions and site
practices provide a safe working environment.
• Electrical Contractors and ESB Networks staff should always be

alert to the dangers and hazards associated with electrical work.
• Part icular attention is required when an installation is made live

whether on a temporary or permanent b asis.
• Always make sure if you make an installation or part of an

installation “live” that you have not created a dangerous situation
for someone else.
• Always check for absence of voltage before you work on any

installation.
Remember the Five Electrical Safety

Rules
1. Disconnect Completely
2. Secure against Reconnection
3. Verify the installation is “dead”.
4. Carry out earthing and short - circuiting
(where appropriate).
5. Provide protection against adjacent “live” parts.
Latest code @ Page IV

ESB NETWORKS INVOLVEMENT IN THE
COMPLETION CERTIFICATE PROCESS
ESB Networks are not involved in, or responsible for, testing a customers electrical
installation. To comply with current legislation a completion certificate is required for all
new electrical installations and some alterations to existing installations. This certificate
is issued to the customer by the electrical contractor indicating that the installation is
constructed and tested to meet Electro Technical Council of Ireland's (ETCI)
requirements.
THE CERTIFICATE SHOULD ONLY BE ISSUED AT THE COMPLETED

STAGE OF THE ELECTRICAL WORK
The completion certificate is required to allow ESB Networks to proceed with their work
for the customer.
It is essential that the correct MPRN (Meter Point Reference Number)

is recorded on the certificate and the address of the installation
matches the MPRN address.
This MPRN number is readily available on correspondence the customer receives from
ESB Networks regarding their application for a new connection/ alterations/rewires etc.
ESB Networks require completion certificates, submitted through the regulatory body,
for the following types of Electrical Work:
• All new installations/re-wires requiring connection to ESB Network
• All alterations to existing installations involving changes to the wiring

between ESB Networks connection point/meter and the customer's
distribution board.
• In multi-tenanted / multi-metered situations a completion certificate is

required for each ESB Networks connection, i.e. one certificate per
customer connection point.
• Where installations such as school signs, phone kiosks, bus shelters etc.
are connected to ESB Networks network, a completion certificate is
required for each connection at the interface.
• All Medium Voltage installations require a completion certificate (Note a

declaration of fitness is also required by ESBN)
• A completion certificate is required before connection will be restored to an

installation that has been disconnected for more than 6 months.
Latest code @ Page V

ESB NETWORKS INVOLVEMENT IN THE
COMPLETION CERTIFICATE PROCESS
In situations requiring close co-operation between ESB Networks and
the Electrical Contractor e.g. W ork outside normal hours, The
following procedure is required:
• It is important to contact the local ESB Networks supervisor at an early

stage in the planning of the work.
• The Customer should ensure that any payments required by ESB Networks
have been paid. ( this will ensure that a service order is in existence.)
• The Electrical Contractor must contact the relevant regulatory body with the
specific certificate number he/she intends to use to certify the finished
work. The specific details required are: Certificate number, type,
Customers correct MPRN and name and address,
• The Regulatory Body will record this initial information which will allow the
ESB Networks service order for this work to be released.
• The Electrical Contractor should use the certificate reserved for the
electrical work to record the test results after the electrical work is
completed.
• Afterwards the fully completed certificate should be sent (without delay) to

the relevant Regulatory Body.
Any contractor working in close proximity to live ESB Networks sealed

equipment (where no main isolator exists) should contact the local
ESB Networks office if he/she requires isolation of that equipm ent to
allow the work to proceed prior to certification.
Latest code @ Page VI

GENERAL REQUIREMENTS
1 CONSULTATION WITH ESB Networks OFFICE

It is essential to consult with the local ESB Networks office at the planning stage of the
following projects: new premises, refurbishment of existing premises, major additions to
existing load. All essential information such as; site maps, architect’s drawings etc.
should be submitted to ESB Networks to allow applications to be processed efficiently.
2 LOAD THRESHOLDS
(a) New Installations:
Single phase whole current meters will be used to measure loads up to 80A per phase.
In general, three phase whole current meters will be used to measure loads over three
phases up to 80A per phase. Current transformers with matching meters will be used to
measure loads in excess of 80A per phase. Allowances for potential load growth should
always be made.
(b) Extensions/Renovations to Existing Metering:

Discuss with local ESB Networks Office beforehand, where, in certain circumstances,
three phase whole current metering at 100A per phase may be considered.
ESB Networks will connect and fit a main fuse unit for total loads within a building up to
300A (200 kVA).
ESB Networks will normally require a Substation for loads in excess of 300A (200kVA).
Customer will supply and fit a main circuit breaker. New loads in excess of 500kVA will
in general be supplied at medium voltage. N.B. Some loads of less than 200kVA
may require a substation in urban locations depending on available capacity.
3 ENCLOSURES FOR METERING EQUIPMENT

(a) Particular to Domestic installations.
(i) ESBN equipment should only be fitted in the outdoor metering cabinet. The only
exception being where the customer’s main Isolation/over current device is fitted in
the cabinet. Where fitted, the device must be located at the bottom RHS of the
enclosure (marked * page 1) to allow future ESBN equipment modifications. N.B.
see ETCI ET101 requirements
(ii) Page 1 shows a typical outdoor Metering cabinet. This is the standard method for
new Metering.
(iii) Where it is clearly impossible to fit ESB Networks’ equipment into an accessible
outdoor location, the ESBN Design office must be consulted at the planning stage,
to determine the most suitable location.
(iv) Where indoor locations are permitted an enclosure shall be provided for ESB
Networks’ equipment. See page 21 for details on enclosures.
(b) Whole Current Metering: Whole current meters and ESB Networks equipment
are installed by ESB Networks in an enclosure supplied and fitted by the customer. (See
page 21).
Latest code @ Page VII

Whole current meter enclosures shall have a (vertically) hinged cover or visor and
standard 8mm Triangular lock.
ESB Networks metering equipment shall be fitted in indoor situations at a height from
floor level no lower than 600 mm to the bottom of the lowest meter and no higher than
2000 mm to top of highest meter.
(c) Current Transformer (CT) Metering: Customer shall supply and fit a sealable
enclosure to accept ESB Networks’ CTs. Where a main switchboard is installed this
enclosure should be within the switchboard. C.T. Meter Cabinets (supplied and fitted
by ESB Networks) are installed on a wall adjacent to the main switchboard. In some
situations consideration will be given to incorporate ESB Networks CT Meters
into the main Switchboard. See page 20. Discuss with Local ESB Networks
staff at the design stage of the Switchboard.
Note: Where the CT Enclosure is of a metal type the cover shall be hinged
(vertically) as well as sealable.
Where the CTs are on the ESB Networks side of the customers main disconnecting
device, the enclosure shall offer protection against contact with live parts by the ingress
of tools, wires or any other foreign body. (IP 3X min.) (Note: For wall mounted Meter
Cabinets, CT Secondary cable run shall not exceed 15 Metres and shall be accessable.)
See 5.
4 REQUIREMENTS FOR METERING ENCLOSURES. USED OUTDOORS
(a) Centralised Multi-Customer metering.
Outdoor locations are not recommende d for centralised multi-customer
metering. Vandalism, interference, and environmental conditions increase the
likelihood of damage corrosion etc.
N.B. All locations other than main switch rooms and standard internal
metering locations are considered to be outdoors.
Because of these considerations and where it has been agreed with ESBN at the
planning stage to locate centralised multi-customer metering outdoors, the following
minimum requirements described in (i) and (ii) shall apply :
(i) The switchboard housing the metering equipment shall be manufactured from
polyester or other suitable non conductive material. A minimum rating of IP44 shall
apply, subject to the environmental influences in the location selected. The
switchboard internal construction shall comply with the standards required for normal
locations.
(ii) In addition all switchboards shall be protected against vandalism/interference by
one of the following methods described in (iii) and (iv) :
(iii) The switchboard shall be installed in a concrete structure that is completely
weatherproof e.g. Where installed on the outside wall of a building it may comprise of
Latest code @
Page VIII
two wing walls constructed at either end of the switchboard with a securely constructed
roof to provide a weatherproof enclosure. Adequate lighting shall be provided.
The doors and door frame of the structure shall be the full width of the switchboard and
shall be manufactured from high grade steel which shall have a minimum thickness of
3mm (door) and all parts shall be treated with hot dip galvanising to EN ISO 1461. In
addition the requirements listed at (v) below shall also apply.
(iv) The switchboard shall be installed in a unit manufactured from high grade sheet steel
which shall have a minimum thickness of 3mm and all parts shall be treated with hot dip
galvanising to EN ISO 1461. In addition the requirements listed at (v) below shall also
apply.
(v) Enclosures must incorporate sufficient internal ventilation to prevent the formation of
condensation but without reducing the degree of protection required. All hinges shall
open a minimum of 180 degrees, door stays shall be provided where necessary. All
below ground parts shall have heavy duty corrosion protection. Consideration shall be
given to the risk of corrosion (as above), dust, vibration, and impacts, and adequate
measures shall be taken to minimise these risks. All external doors shall be fitted with
vandal proof locks to prevent unauthorised entry. The locking devices shall be
manufactured from high grade non corrosive metal. A keysafe (see page XIV) shall be
fitted to the enclosure, the keysafe is supplied by ESBN as part of the agreed design of
the electricity services.
(b) Specific requirements for single customer non-domestic outdoor
enclosures.
A minimum rating of IP44 shall apply subject to the environmental influences in the
location selected. In a horticultural environment, IP55 is the minimum required.
In order to maintain the stability and integrity of enclosures used to house ESB Networks
equipment in outdoor locations, the following minimum specifications shall apply.
Where enclosures are manufactured from ferrous materials, the enclosures
shall be manufactured from high grade sheet steel which shall have a
minimum thickness of 3mm. and all parts shall be treated with hot dip
galvanising to EN ISO 1461.
All hinges shall open vertically a minimum of 180 degrees, door stays shall be provided
where necessary. All below ground parts shall have heavy duty corrosion protection.
Consideration shall be given to the risk of condensation, dust vibration and impacts and
adequate measures be taken to minimise these risks.
Where required, these units shall be fitted with vandal proof locks to prevent
unauthorised entry. The locking device shall be manufactured from high grade non
corrosive metal.
Latest code @ Page IX

Where vandal proof locks are specified, a keysafe (see page XlV) shall be fitted to the
unit, the keysafe is supplied by ESB Networks as part of the design of the electricity
services.
5 PROTECTION FOR SECONDARY CABLES FROM ESB Networks
METERING CTS WITHIN MAIN SWITCHBOARD
Trunking or conduit (min. 75 mm per set of CTs with draw wire) to protect secondary
cables shall be provided by the Customer within the main switch board. This should be
of metal, rigid plastic or similar and shall be accessable throughout it’s route.
Metal trunking of adequate size (MIN. 100mm) shall be provided from the switchboard
to the CT metering cabinet AND MUST BE SEALABLE. See paragraph 9 r.e. ESB
Networks seals
6 ACCESS TO METERING EQUIPMENT
ESB Networks meters should be grouped in one easily accessible location
(Centralised). Where access to metering has to be restricted, a Keysafe is required see
page Xll paragraph 17 for further details. ESB Networks whole current meters and CTs
should be located in one section of a Main Switchboard to allow for regular testing and
inspection. Each set of CTs should be physically separated to allow them be worked
on individually. The phases and neutral cores for each account must be terminated
within the CT chamber. A separate neutral bar shall be provided adjacent to each set of
CTs. Access to ESB Networks equipment must be available at all times. All
enclosures used for ESB Networks meters shall have a standard 8mm
triangular lock fitted. A clear space of at least 1.2m must be left in front of
ESB Networks equipment.
7 UNACCEPTABLE LOCATIONS FOR ESB Networks MAIN FUSES AND
METERS
ESB Networks main fuses and Meters shall not be installed in: Toilets, cellars, boiler
houses, fuel stores, storage cupboards, underneath wooden stairs or any location liable
to dust, dampness, heat, vibration or any location having a corrosive atmosphere. Any
location likely to be blocked by machinery, goods, furniture, or liable to cause accidents
is not permitted.
8 CUSTOMER MATERIALS
The customer shall provide: all trunking, cables and connectors beyond the ESB
Networks main cable terminations. Load cables for connection to ESB Networks main
fuse unit, whole current meters or CTs to be stranded copper conductor or multi-
stranded flexible copper conductor. Where multi-stranded cables are used they must be
fitted with appropriate ferrules or lugs.
Latest code @ Page X

9 ESB Networks SEALS

All access to unmetered enclosures, unmetered fuses, C.T. enclosures, secondary
wiring and busbar chambers and all other possible points of access to unmetered
connections shall be made inaccessible by means of an effective sealing system fitted
by the manufacturer which will be sealed by ESB Networks. Seals should be visible for
inspection at all times.
Note: Sealing holes drilled in cover which allow sealing wire enter the enclosure are
unacceptable.
NOTE TO CONTRACTORS REGARDING ESB Networks SEALS
Electrical contractors are reminded that it is an offence under the “ (Energy)
Miscellaneous Provisions act 1995”, to break ESB Networks seals or to
interfere with ESB Networks equipment.
(1) If you find ESB Networks seals are broken or missing, report to ESB Networks
BEFORE YOU START WORK.
(2) Sealing, and the removal of all seals shall be undertaken by ESB Networks staff
only.
(3) ESB Networks seal numbers are recorded for each installation. Under no
circumstances interfere with them.
(4) Do not work on, or move ESB Networks equipment.
10 LABELLING
Metering equipment shall be labelled ‘ESB Networks Whole Current meters.’ or ‘ESB
Networks CTs etc. Unmetered equipment should be clearly labelled “ESB Networks’.
Labels must be of permanent and durable material. It is important that the electrical
contractor have them in place before connection.
A fire fighting connection taken from the live side of the main circuit breaker should be
suitably labelled, and clearly visible to a person operating the main breaker. Labels shall
be fitted onto the fixed sections of a switchboard so as to eliminate the potential danger
where labelled doors/covers are interchangeable. (See page 39 for details)
In Multi-Metering installations a permanent label is required for the relevant
Apartment/Unit number, the Fuse before the Meter, the Meter and the outgoing
switchfuse/MCB. In Relay installations all control wiring shall be permanently labelled.
These labels shall be fitted at the meter, the relays and the outgoing switchfuse/MCB
before connection..
Latest code @ Page XI

11 TARIFFS
Circuits for separately metered tariffs require electrical and physical segregation. (i.e.
barriers) Providing this is satisfied they may be catered for side by side in the same
enclosure. NOTE: The customer or consultant acting on customer’s behalf should
ensure the correct tariff applies to the installation.
12 SWITCHBOARD ADAPTABILITY
Switchboards being designed for speculative developments should make provision for
the various likely metering permutations to avoid costly alterations at the Connection
stage.
13 MULTI-CUSTOMER PREMISES
For Connections up to 200kVA, the specified fuse units (pages 17-18) shall be supplied
and fitted by the customer before ESB Networks whole current meters and ESB
Networks metering current transformers (CTs). Above 200kVA the customer’s circuit
breaker is fitted before the CTs. All meters and metering equipment for each customer
shall be located at one central point, normally at the termination of ESB Networks
connection cable. In all new indoor installations suitable enclosures shall be provided
to accept ESB Networks’ equipment.
Fuses for Whole Current Metering are supplied by ESB Networks
14 BUSBARS
If more than two connections are required at the main isolator, then a Busbar chamber
is required.
15 MAIN PROTECTIVE CONDUCTOR CONNECTION (NEUTRALISING)

The customer’s Main Protective Conductor is connected to the ESB Networks neutral
at the Main Connection point in a TNCS system. N.B. Customer’s main earth
terminal must not be within ESB Networks’ sealed enclosur e.
16 MAIN CONNECTION POINT

ESB Network’s responsibility extends up to customers Main Connection point: The
Customer / Customers representative has responsibility for the electrical installation
from that Main Connection point. The Main connection point is normally:
In Major Installations:
(a) At ESB Networks main fuses
Or
(b) On Incoming side of customer’s main circuit breaker
Latest code @ Page XII

In other installations:
(a) At connection point of customer’s tails.
Or
(b) On Customer’s side of ESB Networks isolator
In indoor locations where ESB Networks Main Fuse Unit is fitted it shall be
located close to an external door (i.e. within 2mts).
17 ACCESS TO ESB Networks EQUIPMENT ON CUSTOMER’S PREMISES:

Specific arrangements may have to be made for particular premises using key safes
which are available from ESB Networks. Contact local ESB Networks office for
information. (Key safe information - See page XlV)
18 REMOTE READING OF METERING EQUIPMENT:

All Connections at 200kVA and abov e are read remotely using GSM
equipment.
For Quarter Hourly (QH) metering, adequate GSM/GPRS coverage is required at the
chosen metering position to facilitate remote meter reading. If GSM signal strength is
inadequate, provision shall be made by customer/contractor for the installation of
necessary extra cabling and equipment to a suitable alternative antenna location.
Alternatively customer/contractor may supply, at their own expense, a dedicated PSTN
line for meter reading.
19 CUSTOMER SWITCHING SIGNALS:
Where ESBN provide a switching signal to customer’s equipment, e.g. contactor coil for
NSH, the maximum permissable current shall be ≤ 80mA.
Latest code @ Page XIII

Key Safe
1 30mm 103mm
13 0mm
102 mm
• Installed flush with wall to a depth of 103mm

• Available from Local ESB Networks Depot.
• For full specification, refer to current information from ESB Networks
• Keysafe codes: Base: 911551 Cover plate: 911552
Latest code @
http://www.esb.ie/esbnetworks/ncp Page XIV
SYMBOLS USED THROUGHOUT
THIS PUBLICATION
COLOUR CODING USED THROUGHOUT BOOK
SUPPLIED BY ESB NETWORKS SUPPLIED BY CUSTOMER
M M
ESB ESB ISOLATOR SPECIAL ESB
ESB METER TIMESWITCH METER ISOLATOR
3 PHASE
300 AMP
3 PHASE 1 PHASE
80 AMP 80 AMP
CURRENT
ESB CUTOUT ESB CUTOUT ESB CUTOUT TRANSFORMER
Relay
MAIN CIRCUIT
SWITCHFUSE/MCB FUSE ISOLATOR RELAY BREAKER
Latest code @ Page XV

OUTDOOR METERING CABINET
Typical method of installation of outdoor Meter Cabinet
Note:
Meter cabinet
must comply
with ESB
Network s
Specifications
ESB Ne tworks
E quipment fitted in Flange of
outsid e meter bo x. c abinet to be
water sealed
and polythene
damp proof
25mm
* c ourse to be
fitted by builder
Customer
Meter tails to
From finished ground level

enter at the
bottom right
1.2m Max. 1M min.

ESB Networks Customer
Connection Tails entry of the Meter
entry point point
c abinet. See
notes below.
50mm Dia. red electric cable duct, projecting 25mm
inside the meter cabinet.
Water drain hole in the lowest s ection of the pipe.
10mm draw-in rope (free of knots) to draw

ESB Networks cable.
F ixing Spikes
Depth
600mm
Hockey stick for
s ervice cable
• To Comfortably accept the above cabinet, builders should provide an opening of 606mm
(h) x 402 (w) x 155 (d)
• Where applicable, ensure that door hangs so as to allow latch to fall into closed position
• For ESB Networks O/H connection situation see Sketch/photograph on pages 3/4 and/or
contact local ESB Networks office before fitting box
• The meter cabinet must be directly accessible from the main entrance driveway. A
position on the house wall facing the driveway, or within 2m of either corner of this wall is
normally acceptable subject to proper access.
• Each outside box must have identification to associate it with a particular
installation/address, this I.D. should be in place at service installation stage.
See photo 1 page 4 for correct entry points.
Latest code @
Page 1
SERVICE ALTERATION
Existing Service
Retired section
Old Internal
Meter Position New Service
New inlet pipe

1M Approx. (to be fitted by
CROSS SECTION VIEW

To Consumer Unit Customer)
External Meter
Cabinet
External meter
cabinet with
cable entries
at the bottom.
New Service
1.2 M Max. 1M Min.

From finished
ground level
Ground level
Meter Relocation / Service Alteration

where U.G. service is not possible.
• New Service cable to be installed in cavity. If no cavity exists, the service cable
may be clipped on surface to enter meter cabinet at top left hand side.
• Service cables must have mechanical protection when installed in cavity.
• In all cases ETCI rules will apply.
Latest code @ Page 2

SPECIFICATION FOR SINGLE UNDER GROUND
SERVICE CONNECTED TO OVERHEAD NETWORK
ESB Networks
Pole (Existing)
Fla nge of cabine t to be
water sealed and
polythen e damp proof
course to be fitted
Tails from customers

Fuse Board
1 0 mm draw-in rope to
pull in service cables.
All cables to enter the

meter box at the bottom.
ESB
Ne tworks
provide "Hockey S tick Du ct" to
cable project 25 mm into box
protection
From finished ground leve l

from gro und ESB Netwo rks ap proved
1.2 M Max 1M Min.

level to h ockey stick
Ne twork (diameter 44mm)
Connection
ESB Ne tworks approved

WAR NIN G
E LECTRI CITY SUP PLY
warnin g tape at 300mm depth
CABLE DU CTBE LOW
ESB Network s Approved 5 0mm Solid Wall

MDPE/PVC Red Duc t at 600mm Depth
Drainag e slots at
lowest level
• Where specified by ESB Networks, a cable run longer than 50m (approx.) may
require a larger duct and or an approved service vault or both.
• If a 125mm service duct is specified, an ESB Networks approved Service vault will
be required at the interface with the hockey stick
• See Current “ESB Networks Specification for underground Service” .
• 10mm Draw rope in one continuous length.
• In all cases ETCI rules will apply. Circuits shown are for example only.

O UTDO O R B O X LAY O UT/ LO C ATIO NS
Typical layout within outside box. Note: cable entry and exits at
bottom of box.
Photo 1
Customer cable may also

enter through drilled hole
at bottom right hand side
of box.
Photo 2
Typical location of
outside box at side of
house in front of
security gates.
S ee page 1 for
location
requirements

DOMESTIC STANDARD SETUP
Separate Meter and Isolator
DOMESTIC
RCD
ESB
Networks
Isolator
Main protective
conductor to main
M
Neutral
ESB
Networks
Fuse
SERVICE APPROPRIATE
TO LOAD
•In all cases ETCI rules will apply. Circuits shown are for example only.

DOMESTIC STANDARD SETUP
Combined Meter and Isolator
DOMESTIC
RCD
Main protective
conductor to main
Neutral
M
ESB
Networks
Fuse
SERVICE APPROPRIATE
TO LOAD
• N.B. Do not operate isolator on load.

• In All cases ETCI rules will apply. Circuits are shown for example only.

DOMESTIC PLUS STORAGE HEATING
DOMESTIC PLUS SEPARATE NSH METER

UP TO 13kW NSH*
DOMESTIC NSH
RCD
ESB ESB
Networks Networks
Isolator Isolator
Main protective
conductor to main
Neutral
M
NSH
M
ESB
Networks
Fuse
SERVICE APPROPRIATE
TO LOAD
*Installations involving more than a total of 3kW of NSH Load require advance
application to ESB Networks. A charge may apply.
• Combination Meter/isolator may be used
• In All cases ETCI rules will apply. Circuits are shown for example only.

DOMESTIC - DAY/NIGHT
DOMESTIC PLUS UP TO 8kW NSH*

SWITCHING THROUGH CONTACTOR
DOMESTIC NSH
RCD
CONTACTOR N
ROOM
T HERMOST AT
(OPT IONAL)
C ontrol Pair 2 x 1.5sq (BROWN)

ESB
Networks
Main protective
Isolator
conductor to main
Neutral
M
ESB
Networks
Fuse
SERVICE APPROPRIATE
TO LOAD
• Double Tariff Meter/Isolator combination also available.
• Maximum permissable switching current to customer’s contactor shall be ≤80mA.

Method 1
Direct switching at NSH Time switch
DOMESTIC NSH
RCD
Interlock or seperate
fuseboards (ETCI)
ESB
Networks
Main protective Isolators
conductor to main
Neutral
M
ESB
Networks
Fus e
SERVICE APP RO PRIATE

TO L OAD
• Single Domestic Connection plus 13kW NSH. (No looped service to other customer).
• Looped Domestic Connection a combined total of 13kW (across both connections)

Method 2
Contactor switching NSH
DOMESTIC NSH
RCD
CONTACTOR N
E Interlock or seperate
fuseboards (ETCI)
ROOM
THERMOSTAT
(OPTIONAL)
Tails to comply with ETCI
Regulations.
ESB
Control Pair 2 x 1.5sq (BROWN)

Networks
Main protective
Isolator
conductor to main
Neutral
M
ESB
Networks
Fuse
SERVICE APPROPRIATE
TO LOAD

DOMESTIC OR COMMERCIAL
WITH NSH LOADS IN EXCESS OF 13kW
SINGLE PHASE C.T. METERING
(3 PHASE CONNECTION NOT AVAILABLE)
DOMESTIC OR GENERAL PURPOSE NIGHT STORAGE HEATING
RCD
Where
appropriate
CONTACTOR COIL N
C ontrol Pair 2 x 1.5sq (BROWN)

Main p rotective
condu ctor to main
Neutra l
M
Note: Sealed Dome
(provided by
ESB Networks) ESB
must be used. Networks
Fu se
SERVICE APPROPRIATE
TO LOAD
• Service appropriate to Load
• In outdoor locations standard outdoor cabinet with 150A window type CT in
suitable box 125 x 125mm with sealing bush. No file terminals.
• In indoor locations standard CT cabinet with file terminals should be used.
• An option of separate night storage heating meter is available.

DOMESTIC OR COMMERCIAL
WITH NSH LOADS IN EXCESS OF 13kW
3 PHASE CONNECTION AVAILABLE Day/Night Metering
DOMESTIC OR GENERAL PURPOSE NIGHT STORAGE HEATING
RCD
Where
appropriate
CONTACTOR COIL N
Control Pair 2x1.5sq mm (BROWN)

E
ESB
Networks
Isolator
Main protective
conductor to main
Neutral
M
Ensure that the
contactor coil
and time switch
ESB are fed from the
Networks R phase.
Fuses
SERVICE APPROPRIATE TO LOAD
• ESB Networks isolator will only apply up to 80amp service.
• See page 21/22 for space required for ESB Networks main fuse.
• In all cases ETCI Rules will apply. Circuits shown are for example only.
• An option of separate night storage heating meter is available.

CONNECTION CHECKLIST
• Application for Connection submitted to ESB Networks?

• Correct level of Connection Capacity applied for?
• Maximum Import Capacity (MIC)
• Have you registered with a Supplier?
Terms for Connection issued by ESB Networks and accepted by
customer?.
• Suitable location for Connection agreed with ESB Networks?
• Is there sufficient space provided for ESB Networks equipment?
• Are trenches, ducts and ways, provided for the installation of ESB
Networks cable to the correct specification?
• Access arrangements for ESB Networks staff to premises/building.
• Have you returned your signed connection agreement(If required)
• Is the installation completed?
• Completion certificate?
Specific to Multi-Metering Connections

• All temporary connections to Multi Meter Board must be removed
before ESB Networks staff commence work.
• All unconnected tails within Metering Cabinet must not be
energised from another source and must be insulated to prevent
accidental contact with the conductor.
• All apartment doors must have permanent numbers fitted.
• All un-metered fuses and outgoing switch fuses must be
permanently labelled with the relevant apartment numbers.
• Permanent numbers must be available for each meter.
• Circuits to the apartments, including the control wiring must be
checked out before certification.
• All unmetered equipment to be sealable.
• Code of Practice requirements must be complied with including
the height of ESB Networks equipment from the floor. Permanent
access to the metering equipment must be in place. This will
normally require the installation of a Key Safe. See page XIV.

ASSEMBLER'S CHECKLIST
All single customer, outside enclosures for ESB Networks metering
equipment shall comply with ETCI “ Code of Practice for the Design
and Erection of Low Voltage Switchgear Assemblies”.
All outside encl osures used for ESB Networks’ equipment must be
IP55 and either non-metallic, stainless steel or hot dip galvanised.
Where multi-customer centralised metering is permitted outdoors,
please refer to pa ge Vlll for special minimum requirements.
N.B. Customer’s main earth terminal bar must not be within

ESB Networks’ sealed enclosure.
1. Provide sealing facilities at :

• Main Isolator.
• Un-metered cable/busbar sections.
• Un-metered fuses. (individual sealing)
• Shrouding around un-metered fuse units.
• Meter mounting plate.
• All surface mounted trunking used for unmetered wiring.excluding
panel trunking
• All unmetered equipment.
2. Shrouding (At Unmetered Fuses)

• 80/125 Amp front loading fuses must have a front loading cover that
has one continuous piece with separate windows cut at 20mm
spacing between each fuse
• NH type Fuse units shrouding to minimum IP2X.
3. Dividers
• Metered and un-metered sections separated.
• Un-metered fuse sections separated from other live equipment.
(To allow replacement in safety)
4. Customers Outgoing File Terminals:

• All terminals shrouded.
5. Labelling :
• On un-metered fuses
• On meters
• On control wiring
• On time-switches
• On Customers outgoing switchfuse or MCB
6. Relays (Not for new installations):

• Are in self contained sealable compartments?
• Numbered tags (Apartment/Unit) on control wiring at relays, meters,
and outgoing file terminal connections.
• Time switch fused at 10A. This fuse must be located in the same
section of the board as the customer’s unmetered fuses.
7. ESB Networks Time Switch :

• Locate with ESB Networks meters.
• On non relay installations: meter and Time Switch adjacent.
• D/T Dial control cables in place.
8. Holes for Meter and Time-switches :-

• To specified spacing. (Available from local metering supervisor)
• Hole size 3 to 4mm
• Provide 3 to 4mm x 10mm stub ended screws. (Posi-drive, self tappers
etc.) These fixing screws for whole current. meters are supplied
by the Assembler. If longer screws are required, they are supplied by
ESB Networks.
9. Meter Tails / Unmetered Cables :

• Ferrules must be fitted on multi stranded cables.
16sq. Cable - Ferrule 28mm long incl. insulation -16x28
25sq. Cable - Ferrule 28mm long incl. insulation -25x28
• Tails are identified and permanently marked. (Apartment/Unit)
• Each Neutral to be identified at bus bar and meter position
• Where cables are concealed they shall be accessible for inspection.
This access shall be gained through the removal of an ESB
Networks seal. These cables should not be clipped or tied, so
that individual cables can be replaced readily.
10. Unmetered Fuses: (pages 17-18)

• Whole current: - ESB Networks will provide fuses.
• C.T.s: - Assembler provides NH fuses in Units to IP20.
• Fuses should not be loaded before connection.

11. 300A Connection:

• Multi stranded cable is acceptable for all new 300 Amp ESB
Networks cut outs.
• Note: Where connection is required to existing older type ESB
Networks cut outs, stranded or solid (Soldered) tails may be
required. Consult with local ESB Networks.
12. Over 300A connection:

• Copper bars tinned to accept ESB Networks Connection cables.
(Pages 25,26 or 36)
13. Customers circuits:

• Under no circumstances should customer circuits pass through un-
metered sections.
14. C.T.s : (Pages 24-26)

• Neutral and Earth terminals adjacent to C.T.s
• Double support on busbars.
• Main isolator should be adjacent to Connection Point.
• Sizings/spacings comply.
• In self-contained units fit separators top and bottom.
15. Locks:
• Triangular, 8mm.
16. On site :
ESB Networks main connection cut out:
•Is provision required for it within the board? (See page 23)
•Will ESB Networks connection be to left, right, top or bottom of
board?
•Main isolator should be adjacent to connection.
•For connection over 300amps, Main circuit breaker must be
directly over the incoming duct from ESB Networks substation.
•Is all metering equipment at correct height?
(See page Vll, including paragraph 3 item b)
17. Colour Coding: -

• To ETCI wiring rules. - Reference ET 101.

FUSES BEFORE WHOLE CURRENT
METERS IN MULTI-METERING
INSTALLATIONS
80 Amp Fuse units conforming to

BS7657 which accept RH/RHL
cartridge fuses approved to either
BS 1631 or BS 88 part 3.
All must be individually sealable.
80/125A front loading unit with

22 x 58 fuse link conforming to
IEC 408-269.2
All must be individually sealable.
A 20mm (min) space being left

between each unit.
For 3 Phase Metering the units

may be ganged to accommodate
one seal.

FUSES BEFORE CT METERS IN
MULTI-METERING INSTALLATIONS
UP TO 200 kVA
NH type units conforming to IEC/EN 60269-2-1 and

DIN 43620, with shrouding conforming to IP 2X enclosing all
terminals.
NH pull down disconnector approved for connections over 80
Amp and up to 300Amp
Access cover of enclosure containing NH units must be
sealable.

REQUIREMENTS FOR FRONT
LOADING FUSE UNITS
20mm space
between fuses
Seals applied here
Each fuse
individually sealed
The shrouding at unmetered fuses must be one continuous piece

with separate windows cut at 20mm spacing between each
Fuse Unit.
Each Fuse Unit must be individually sealable.
Shrouding at Fuses must be sealable.
Fuses should not be loaded before connection.

USEFUL GENERAL DIMENSIONS
CT Meter Cabinet Incorporated
in Main Panel Enclosure Dimensions
Minimum 350mm
Max 2M from
floor level Minimum
Meter Enclosure 750mm
Internal
100mm
Trunking
Minimum height to floor level 600mm
• Enclosure must be located directly adjacent to CT enclosure on left or

right hand side or above.
• For the left or right option, bottom of meter enclosure must be at the
same level as bottom of CT enclosure.
• Minimum depth 200mm clearances from back plate to nearest intrusion on inside
of door.
• Maximum depth 250mm (back plate to door).
• 100mm Trunking installed as shown.
• Secondary cables from CT enclosure must enter 100mm trunking.
• Enclosure to have hinged door, 8mm triangular lock.
• In all cases ETCI rules will apply. Circuits shown are for example only

For Cabinets/Boxes
For indoor use in Industrial/Commercial single customer

installations
General Purpose Metering General Purpose & Night Storage Heating Metering
Customer
Isolator
M M M
TRUNKING
ESB E SB ESB
Ne tw orks Ne tw orks Ne tw orks
Iso lator Isol ator Iso lator
ESB ESB
Netwo rks Netwo rks
C ut-ou t C ut-ou t
ESB Networks 3 Phase Indoor Domestic enclosure ESB Networ ks Sing le Phase
80A Fused Cut-out Where permitted 80A Fused Cut-out
1M
Enclosure
Depth 200mm
Floor level
Note: The above dimensions are the minimum acceptable.

• In all cases ETCI rules will apply. Equipment layout shown is for example only and
is not to scale.

For Multi Metering Panels
200mm
150mm
3 Phase
Meter
355mm
Single
Phase
230mm
Meter
Trunking 100 mm (Min.) Trunking 100 mm (Min.)
160mm
For Multi metering Panels
80 Amp
150mm clear space must be left from meter
240mm
Timeswitch
mounting surface to nearest intrusion inside door.
100mm Trunking (min) to be used as indicated
Trunking 100 mm (Min.)
ESB Networks Isolator dimensions:

• 3Ph 120 x 115 x 80mm
• 1Ph 120 x 70 x 80mm (type 1)
• 1Ph 90 x 90 x 80mm (type 2)
•In all cases ETCI rules will apply.

SPACE REQUIRED FOR ESB Networks
CABLE TERMINATIONS < 300A
Preferred Option If req uired to insta ll in

Wall mounted outside an enclosure , Minimum
dimension s as below.
switchboard Minimum P lease se e enclosure base
space required as below options fo r cabl e e ntry
300mm Deep
Includes Header Trunking of 100mm
300 A
Note : Removable
(1M minimum)
base plate required in

1.2M
order to bend cable
into position when
terminating.
Floor level
600mm 600mm
Op tio n 1
Slo tted Ba se to
accomoda te cable
installation.
O ption 2
S plit B ase to
accomo date
cab le insta llation.
• Where cut out is wall mounted outside switchboard, adequate mechanical

protection must be provided for incoming cable
• The slot for cable entry is required in base plate only.

FOR CT ENCLOSURES
250/5A C.T. Enclosure

Min. 500mm
Min.
380mm
• CTs shall be enclosed under a sealable cover.

• Where this enclosure is metal it shall be hinged as well as sealable.
• Load Neutral and Earth Bar to be provided in enclosure.
• Height and width dimensions of CT enclosure may be reversed
• Maximum depth of mounting surface 250mm.
• Note: in Multi CT meter installations, the MINIMUM height above floor level for
mounting the the CTs is 600mm.

CT CONNECTIONS
PROVISION AT CUSTOMER
CIRCUIT BREAKER FOR 250/5 and 600/5 CTs
For 1 or 2 Cables For 3 Cables
per phase per Phase
Typi ca l E
under 600 Amps. over 600 Amps Ma in
P rote ctive
Co n du ctor
Co nn e ction
po in t
Suppo rts 7 0mm 7 0mm
130 mm 1 10mm 17 0mm 10 0mm

Dia.8mm
Do uble
Sup ports
Dia .8 mm Dia.8mm
800m m
fro m floo r
leve l
40mm x 10 mm 80mm x 10mm
Tinned C opper T inn ed Copper
Detail for back to back cable connection
• For angled drops from CB 100mm spacing must be maintained.

• Coppers to be mounted with 60mm clearance from front or back
• Copper bars must be tinned because there are aluminium lugs on the
Networks cable.
• Neutral bar and Earth Bar can be accommodated at bottom of enclosure
• When this enclosure is metal it shall be hinged as well as sealable.
• Cable connection bolt hole diameter 16mm
• CT bolt hole diameter 12 mm
• Note: in Multi CT meter installations, the MINIMUM height above floor level for
mounting the the CTs is 600mm.
• Current Transformers rated at 250/5A can safely carry currents of up to 400A
• Current Transformers rated at 600/5A can safely carry currents of up to 1000A

CT CONNECTIONS
PROVISION AT CUSTOMER’S
CIRCUIT BREAKER FOR 1500/5 CTs
E
Typical
Main Protective
Conductor
Connection
point
Double
Supports
40mm
40mm
130mm 100mm
Dia.8mm
40mm
70mm
Double
Supports
800mm
150mm
from floor
level
80mm x 10mm
Tinned Copper
Detail for back to back cable connection
• For angled drops from CB 100mm spacing must be maintained.

Networks cable.
• Coppers to be mounted with 60mm clearance from front or back.
• Where this enclosure is metal it shall be hinged as well as sealable.
• Cable connection bolt hole diameter 16mm
• CT bolt hole diameter 12 mm
• Main protective conductor connection point shall be within the sealed enclosure.

DOMESTIC PLUS NSH
DAY/NIGHT METERING OR DOMESTIC PLUS SEPARATE
NSH METERING
(will also suit small industrial/commercial premises)
Control pair
from each apartment.
Sw-Fu se/Mcb
To co mpl y with ETC I
M M M M
NSH
Refer to page 23
Space required for
cable terminations
M M
NSH
ESB
Networks
CUT OUT
0.6 Min to bottom of meter

2M Max. to top of Meter
For fuse type see page 17
0.2M Min to bottom
1m
of fuses
BU S BAR
C HAM BER
• Switchboard assemblers note:

• Minimum spaces allocated for each meter per page 22
• Labelling: Fuses, Meters and Isolators MUST have permanent labels before connection.
• Apartments must be permanently numbered before connection.
• All surface mounted trunking used for unmetered wiring must be sealable
except for panel trunking.
• All unmetered equipment must be sealed.
• Refer to Assembler's Checklist page 14.
• Service size appropriate to load.
• See Pages 21 and 23 for space required for ESB Networks main fuse cut-out
Where multi-metering is permitted outside, special minimum requirements for the
enclosure are mandatory. See page Vlll for details.
• Main protective conductor connection point shall be at main ESB Networks Cut-Out.

APARTMENTS DAY/NIGHT
ELECTRONIC METERING FROM 2008
DAY/NIGHT METERING TO SWITCH NSH CONTACTORS.
(Will also suit small industrial/commercial premises)
Co ntrol pair from each apartment.
Sw-F use/Mcb
To comply w ith ET CI
M M M M M
Refe r to page 23 for
Sp ace required for
cable terminations
M M M M M
ESB Networks
Cut-Out

For fuse type see page 17
1m
0.2M Min to bottom
BUS BAR
of fuses
CHAMBER
• Labelling: Fuses, Meters and Isolators MUST have permanent labels before connection.
• Apartments must be permanently numbered before connection.
except panel trunking.
• Refer to “Assembler's Checklist” page 14.
• Service size appropriate to load.
• See Pages 21 and 23 for space required for ESB Networks main fuse Cut-Out.
Where multi-metering is permitted outside, special minimum requirements for the
enclosure are mandatory. See page Vlll for details.
• Main protective conductor connection point shall be at main ESB networks Cut-Out.

RELAY CONTROL DIAGRAM
NOT FOR NEW INSTALLATIONS
SUITABLE FOR DAY/NIGHT MULTIMETERING
Note: All control wiring including connections to time switch
and relay coils provided by customer.
Ex ample of 1 installation
M
Can be repeated by up to 16 per time c lock
To N.S.H. contac tor coil circuits.

CONTAC T STAT E
s
SWITCHING TIME
DT (d1) N.S.H. (d2)
tio n
a
Brown
l
White
l
ON 0800 ON 2300
OFF 2300 OFF 0800
ta
Red
Blue
ins
13 14 13 14 13 14 13 14
TIME SWITCH
23 24 23 24 23 24 23 24
(Minimum space reqd. for T/S:
ew
230mm high X 150mm wide) 33 34 33 34 33 34 33 34
rn
43 44 43 44 43 44 43 44
53 54 53 54 53 54 53 54
f o
63 64 63 64 63 64 63 64
t
73 74 73 74 73 74 73 74
No
SWITCH SHOWN 83 84 83 84 83 84 83 84
IN NIGHT
POSITION
A1 A2 A1 A2 A1 A2 A1 A2
L
d1 d1 d2 d2
N
• 10 Amp fused feed to each time switch from unmetered connection (fuse supplied by
customer) Labelled Time switch feed fuse must be located with all other unmetered
fuses. Time Switch to be surface mounted at eye level.
• Relay wiring -
1.5sq.mm flexible or stranded single P.V.C. cable. d1 red/blue d2 brown/white.
NOTE: all cable connections must be fitted with ferrules of the correct length.
• Control cable to be labelled with flat/unit identifiers at outgoing file terminals, at both
sides of the relay and at the meter.
• Relays to be in a sealed, self contained enclosure.
• Relays to be of an approved type with CE mark and must comply with IEC 60947, or
equivalent EU National Standard e.g. BS, VDE.
• Relays to be interchangeable and mounted on Din Rail.
• Relay coils to be rated at 230V, with 8 normally open contacts rated at 400V.

COMMERCIAL/INDUSTRIAL PLUS
SEPARATE NSH up to 300A (200kVA)
MULTI - CUSTOMERS - WHOLE CURRENT
PHYSICAL LAYOUT (Will also suit industrial premises)
Sw-Fuse/Mcb
To comply with ETCI
M
R efer to page 2 3 for
Space required for
cable terminations
M M
Inc ludes Header Trunking of 100mm (min)
ESB
Ne tworks
CU T OUT

F or f use type se e page 17
1m
0.2M Min to bottom
BUS BAR
of fuses
CHAMBER
• Labelling: Fuses, Meters and Isolators MUST have permanent labels before
connection.
• Units must be permanently identified before connection.
except panel trunking.
• Refer to Assembler's Checklist page 14.
Where multi-metering is permitted outside, special minimum requirements for
the enclosure are mandatory. See page Vlll for details.
• Main protective conductor connection point shall be at main ESB Networks Cut-Out.

PARTICULAR TO
APARTMENT/OFFICE BLOCKS
1. The final connection arrangements in Commercial Units seldom

become apparent until a very late stage. Therefore, various metering
permutations should be considered in the main switchboard at the
design stage. This may avoid subsequent costly alterations.
2. Page 37 will cater for Multi-Customers.
Pages 32, 33 or 35 will cater for One Customer occupying the entire
building with Metering before the customer’s main circuit breaker.
3. Centralised metering is the preferred option.
De-centralised Metering using unmetered mains is acceptable

in some ”Limited” situations.
If it is agreed with ESBN to have de-centralised metering

through the use of unmetered mains, you must contact the
local ESB Networks Design Manager and get agreement
before finalising your electrical design.
NOTE: The installation/design of unmetered mains is

specified by ESBN
NOTE: The customer or agent acting on customer’s behalf

should consult with the supplier to ensure the correct tariff
applies to the installation.

ESB NETWORKS MAIN CONNECTION
FUSED UP TO 300A (200KVA)
ARRANGEMENT FOR ONE CUSTOMER BULK TARIFF
Option 1 Option 2
Whole Current Current Transformer
Sw-Fuse/MCB
To comply with
ETCI
ESB
Networks
M
Isolator
M C.T . Meter
Refer to page 23
Space required for
Includes Header Trunking of 100mm (min)
cable terminations
ESB ESB
Networks
Networks
CUT OUT CUT OUT
Min. 1m Max 1.2m

1m
• In indoor locations ESB Networks Main Fuse Unit shall be located close to an
external door (i.e. within •2m).
• ESB Networks supply and fit Time switches to control meter dials and off peak
load.
• For Whole Current Metering up to 100A. ESB Networks Isolator to be used
• If Fire Fighting equipment is installed, please refer to page 38.
• For meter cabinet sizes please see pages 20, 22 and 40.

ESB NETWORKS MAIN CONNECTION
FUSED UP TO 300A (200KVA)
ARRANGEMENT FOR ONE CUSTOMER
MULTI-TARIFF
TO CUSTO MERS EQUIP MENT
Sw -Fuse/MCB
To comp ly with ETCI
M M
Re fer to page 2 3
Sp ace r equired for
ca ble terminati ons
In clude s Hea der Trunk ing of 100m m (mi n)
ESB
Networks
CUT OUT
2 00Amp / 300 Amp

E SB Networ ks Cut
Ou t
1m
• In indoor locations, ESB Networks Main Fuse Unit shall be located close to an
external door (i.e. within •2m).
• The ESB Networks service cable should penetrate no more than 2m on the
horizontal from the inside of the main external wall.
• For Cabinet sizes please see page 20, 22 and 40.
Where multi-metering is permitted outside, special minimum requirements
are mandatory. See page Vlll for details.

CONNECTION OVER 300 AMPS (200kVA)
N.B. Some loads of less than 200kVA may require
a substation in urban locations.
Direct connection from Sub Station
ESB Networks Sub Customer

Elevation View Switch Room
Customer Main
Circuit Breaker
ESB Networks
LT Panel
Cable Duct
Total Cable length not

to exceed 10 Metres
ESB Networks Sub Customer Main

Circuit Breaker
Plan View
ESB Networks
LT Panel
Customer
Switch Room
• Customer switch room must be adjoining ESB Networks substation.

• Customer’s Main circuit breaker must be located directly over the incoming service
duct from ESBN substation at the point where it enters the customer’s main switch
room.
• ESB Networks cable run to Customer Main Circuit Breaker must not be more than
10 metres in total•length and no more than 3 metres within the customer’s
Switch Room. (ETCI requirement)
• See current general specification for MV substation buildings.

CONNECTION OVER 300 AMPS
ESB NETWORKS CONNECTION DIRECT

TO CUSTOMERS MAIN CIRCUIT BREAKER
ONE CUSTOMER
MAIN SWITCHBOARD
TO CUSTOMERS EQUIPMENT
• Labelling: All switchgear including metering equipment must be permanently

labelled before •connection.
• See pages 25-26 for information on CT Connections.
• Refer to page 34 re: max cable run.
• Customer’s main earth terminal bar must not be within ESB Networks’ sealed
enclosure
• Where incoming service cables are fed from above, it is permissable to
terminate these cables into the top of the switch board. All cables must be
adequately glanded to prevent ingress of moisture.

Where ESB Networks cables terminate directly onto

incoming main Circuit Breaker
Separate Doors
• Approved Sealant required at cable entry

Networks cable.
• Above photograph shows connection to multi-customer installation. Multi-
metering •arrangement as per page 37
• In single customer installation CTs are fitted before main CB. The door on
this •enclosure must not be interlocked with main CB i.e. separate doors.
• For ESBN main incoming cable detail, please refer to pages 25 and 26 for busbar
drilling details.

CONNECTION DIRECT TO CUSTOMERS MAIN CIRCUIT
BREAKER
MULTI CUSTOMERS -
CENTRALISED METERING
Customer Customer
over over
200 KVA 200 KVA
Switch Fuse/MCB
To comply with ETCI
M M
Lock Off Lock Off
Facility Facility
required required
Switch Fuse
or MCCB If required.
For short circuit
protection within the
board
• Labelling: All switch gear including metering equipment must be permanently

labelled before connection.
• Circuit mains connecting each customer must be numbered/labelled at both ends
and correspond with unit/door numbers/labels.
• Protection / Short Circuit device controlling unmetered rising main shall be
lockable in the OFF position.
• Leave space for CT meter Cabinet.
• Refer to page 34 re. max. cable run.
enclosure
• For connection greater than 200kVA (300A), the Circuit Breaker must have
a lock off facility.

ARRANGEMENTS FOR
FIRE FIGHTING CONNECTION
To F.F. To Customers To F.F. To Customers
Equipment Equipment Equipment Equipment
Main
Isolator
(ETCI)
F.F. CT's F.F. CT's
F ig. 1 Connection up to 300A. Fig. 2 Over 300A.

F rom live side of Cutout. ESB Multi Customer ESB
Multi or Single Customer Networks Networks
C onnec tion Connection
To F.F. To Customers To F.F.

Equipment Equipment Equipment
To Busbar
Systems
M
Mech. or Elec t.
C I nterlock
Mech. or
Electrical
In terlock
C
Fig. 3 Connection over 300A. ESB Fig. 4 Connection over 300A. ESB
Single Customer Multi Customer. Multi
Networks Networks Generator
Changeover Dual Busbar
C onnec tion C onnec tion
• Switch Fuse to be fitted as near as possible to ESB Networks•incoming

connection.
• Warning labels to be applied to Main CB and FF switch fuse
See page 39 for wording
The isolation/overcurrent device (including the incoming conductors), for
fire fighting supplies shall have an adequate short circuit rating.

FIRE FIGHTING SAFETY LABELS
Wording required on Fire Fighting (F/F) Labels.

Labels to be securely fitted at appropriate points.
Labels for fig. 1 page 38

(a) Label for E.S.B Networks Cut Out (b) Label for F/F Switch Fuse
DANGER DANGER
Connection to F/F Fed from
fed from live side of live side of E.S.B
E.S.B Networks Networks
Cut out Fuses Cut out Fuses
Labels for fig. 2 and fig. 3 page 38

(a) Label for Main Circuit Breaker (b) Label for F/F Switch Fuse
DANGER DANGER
Connection to F/F Fed from
fed from live side of live side of
Main CB Main CB
Labels for fig. 4 page 38

(a) Label for Main Circuit Breaker, (b) Label for Generator Main Circuit Breaker
Fire fighting Fuse and Switch Fuse and Stand-by F/F Switch Fuse
DANGER DANGER
Connection to F/F Connection to F/F
fed from live side of fed from live side of
Main CB Generator CB

ESB Networks MAIN CONNECTION
OVER 300A (200kVA)
PHYSICAL LAYOUT FOR SINGLE CUSTOMER
Wall Mounted Switchboard

Space for meter cabinet
600 x 600
Circuit Breaker
ESB Networks C.T.s

C.T. Provision as on 100mm x 100mm Trunking
pages 25/26
1.0M To 1.2M
ESB Networks Termination
Space required for
cable make-off
as on pages 25/26
Floor level
• Separate doors for CTs and CBs.

• A clear working space of 1.2m in front of ESB Networks equipment.

SHOPPING CENTRES AND
COMMERCIAL/INDUSTRIAL UNITS
Discussion with local ESB Networks office is essential
during the planning stage, at which time the appropriate
method of connection/metering will be agreed.
Shopping Centres:
Experience has shown that Meters fitted inside each unit will inevitably
be covered up by permanent shelving and / or display units.
Therefore the only suitable and safe location is a centralised switch
room.
Centralised Metering is the preferred method See Page 42.
If Centralised metering cannot be achieved, agreement must be

sought from the ESB Networks Design Manager regarding metering
location.
Commercial/Industrial Units:
Centralised metering. See Page 42.
Alternative method: individual connections from ESB Networks.

Page 43 shows mini-pillar application
General
A clear space of 1.2m must always be left in front of ESB Networks

equipment.
Standard locking device (8mm Triangular Key outdoor cabinet type)

shall be fitted by Customer to provide access to all enclosures
containing ESB Networks meters/main fuse units.

SHOPPING CENTRES or
CENTRALISED METERING
SUPERMARKET
10 11 12 13 14 15 16
Meters here 8 7 6 5 4 3 2 1
Switchboard
arrangements
Page 37 Customers Switchgear
• Centralised Metering is the preferred option.

• In exceptional circumstances de-centralised metering will be considered.
• Units requiring connection, must be permanently numbered.
• Sufficient space shall be provided for ESB Networks equipment.
• Refer to page 21 and 23 for space required for ESB Networks main fuse units.
• Refer to page 30 for min/max height of meters.
• A clear space of 1.2m shall be left in front of ESB Networks equipment.
• Completion Certificates submitted for connection to an individual unit must be for
the completed wiring of the unit and all associated cables from the meter position.

ALTERNATIVE METHOD SHOWING

INDIVIDUAL CONNECTIONS FROM ESB Networks
ESB Networks
SUB
Mini Pillar
Mini Pillar
Mini Pillar
• ESB networks equipment shall be fitted within 2 metres of shop/unit door.

• Units requiring connection, must be permanently identified.
• Circuit mains connecting each unit must be identified/labelled at both ends and
correspond with unit/identification.
• Refer to page 21 and 23 for space required for ESB Networks main Fuse Units.
• Refer to page 30 for min/max height of meters.

GROUPS OF SHOPS/OFFICES
FACING ONTO PUBLIC ROADWAY
Office Units Office Units

ESB Networks
Mini Pillar
Commercial Unit Commercial Unit

Heavy
duty
cut-out
Cutout Cutout
and and
Meters Meters
• The appropriate method of connection and metering will be confirmed by the local
ESB Networks design office at the planning stage.
• ESB Networks equipment must be fitted within 2m of commercial unit door.
• Units must be permanently identified.
• Circuit mains connecting each unit must be identified/labelled at both ends and
correspond with unit/door identification.
• Refer to page 21 and 23 for space required for Cut Outs.
• Refer to pages Vll and Vlll paragraph 3B for min/max height of metering equipment.
• A clear space of 1.2m must be left in front of ESB Networks equipment.

CONNECTION FOR COMMERCIAL
TEMPORARY INSTALLATION
This is the only situation where customer’s equipment
will be mounted in the same enclosure as ESB Networks equipment.
Note: Customer’s equipment to be mounted on Right Hand Side
M
RCD
E
ESB
Networks
Isolator
ESB
Networks
FUSE Main protective
conductor to main
Neutral
IP55 Gland
where surface
box is used
Socket to EN60309/2 standard

located outside cabinet.
• N.B.This layout can only be used for Commercial Temporary supplies

• This interface shall not be located at the permanent metering location
• Connections for temporary installations should not be installed either within or on
the exterior of any temporary building or structure e.g. portacabins, containers etc.
They should only be installed within or on a robust permanent structure that will not
be moved as part of any site works e.g. boundary wall, existing building or specially
constructed concrete housing. See Appendix E at back of this publication.
• Enclosures used to house such connections must be made from non-conducting
material.
• Standard outdoor meter cabinets - surface mounted - are not suitable for
use in any situation.
• All installations must comply with ETCI rules. Circuits shown are for example only.
Latest code @
http://www.esb.ie/esbnetworks/ncp Page 45
PETROL STATIONS
Steel Wi re A rmoured Cable
Pillar supplied by
contractor usually
To ESB Networks
located away from
Mete ring Equip men t
pumps at nearest
point to roadway.
Min. IP44 supplied
by contractor.
Includes Header Trunking
of 100mm (min)
1m
ESB
Ne tworks
connection
• See pages 21 or 23 for space required for ESB Networks Main Fuse Unit.
• Control of standby generator shall be arranged to prevent generator start-up if main
isolator is switched off for emergency/maintenance.
• Note: enclosure should be sized to allow adequate space for the customer’s
equipment and the ESB Cut out.
• N.B. Outside enclosures used for housing ESB Networks’ equipment must
be either non-metallic, stainless steel or hot dip galvanised and have a
Minimum IP44 rating. See specific requirements 4 (b) page lX

STAND-BY GENERATORS
Manual Changeover
Customers Load
STANDBY GENERATOR
Changeover
Switch
Customers
M ESB
Main Switch Fuse
Networks
Isolator
ESB
N etworks
CU T OUT
Main protective
conductor to
main Neutral
ESB
Networks
Connection
• See page 48 for Auto Change Over installations

• See page 49 for standby generator in multi customer situation
• In all cases change over must occur after ESB Networks meters
isolator •is switched off for emergency / maintenance.

STAND-BY GENERATORS
Auto Changeover
For Auto Change Over Generator installations

please see the current ETCI Rules
To Customer's Load
Con trol
Relay
Generator
Main C/B
C/B
Mechanical or Ele ctrical Interlo ck
ESB Ne tworks
Meter ing CT's
ESB Networks
Connection Ge nerato r
• See page 49 for standby generator in multi customer situation

• In all cases change over must occur after ESB Networks meters
• Control of standby generator shall be arranged to prevent generator start-up if
main isolator is switched off for emergency /maintenance.

STAND-BY GENERATORS
Multi Customer
For Auto Change Over Generator installations
please see the current ETCI Rules
Typical for Whole Current Typical for CT Metering Typical for CT Metering
Metering with contactors with circuit breakers
C C C C
M
Mech. or Mech. or
Electrical Electrical Mech. or
Interlock Interlock Electrical
Interlock
Me cha nic a l or
Ele ctr ica l
Inte rlock
ESB
Networks
Connection Generator
• In all cases change over must occur after ESB Networks meters.
• If Fire Fighting (F/F) equipment is installed, see page 38.
isolator •is switched off for emergency /maintenance.

AG R IC ULTUR AL/ HO R TIC ULTUR AL
P R E M IS E S
NOTE: It is essential that these requirements are complied with by
Customer/Contractor to ensure prompt installation of ESB Networks
connection cables.
All s ervice termina tions s ha ll be enclos ed within a n IP 55 ra ted

enclos ure. E ntries into s uch enclos ures mus t be gla nded to ma inta in
IP 55 s tandards .
An (IP 55) M E TE R E NC LO S UR E (6 6 0 0 x 400

0 x 2 0 0 minimum) e.g.
P olyes ter/ S ta inles s , s teel is required for one s ingle pha s e meter
(a nd time s witch if required.). This is provided a nd ins ta lled by
cus tomer to hous e E S B Network s equipment. F or other metering
a rra ngement a la rger enclos ure will be required. The loca tion of the
C a binet s hould be agreed with the loca l E S B Network s office
beforeha nd, whether indoor O R outdoor.
SPECIFICATION FOR STANDARD UNDERGROUND SERVICE

SUPPLIED FROM OVERHEAD NETWORK
A suitable size red electric cable duct to be provided by Customer in a
600mm deep (minimum conditions*) trench from the meter cabinet to ESB
Networks pole. The duct should have a minimum radius bend of 450mm. The
duct should contain a 10mm, strong draw rope to facilitate the pulling in of
ESB Networks service cable.
ESB Networks approved warning tape “Electric cables below” should be laid
300mm above the duct inside customer’s property.
The installation of meter cabinet and duct(s) should be in accordance with

best building practices, this code, and ETCI IP standards.
AB O V E E LE C TR IC AL INS TALLATIO NS R E Q UIR E IP 55 S TANDAR D

TO C O M P LY W ITH E S B NE TW O R K S R E Q UIR E M E NTS
S afety Note: Your attention is drawn to the potential danger of working

in close proximity to electric lines. If there is an existing line nearer than
25 meters to your proposed building (including TV aerial) no
construction work should commence until ESB Networks have checked
the situation.
* In all cases ETCI rules will apply
REMOTE BUILDINGS AND
ELECTRIC FENCES
ESB
Networks Pole
Outdoor: Meter enclosure and rising main
cables, where surface mounted should have
appropriate mechanical protectection.
OUTDOOR INDOOR
Meter Cabinet IP Rating to

with IP55 rating for ETCI Standards
ESB Networks For Customer's
equipment. distribution board
ESB
Networks
provide
cable
protection
from ground
level to
Network
Connection
IP55 rated glands
Ground Level
ESB Networks approved
Warning Tape at 300mm depth
WARNING
ELEC TRI CI TY SUPP LY
C ABLE DU CT BELO W
Drainage Slot
• Standard Domestic Meter Cabinets are not acceptable for this application.
• Enclosure shall be stainless steel or non conductive minimum IP55
• Customer’s Earths must not be within 25m of ESB Networks poles.
•*In all cases ETCI rules will apply. Circuits shown are for example only.

SPECIAL SITUATIONS
FUNDAMENTAL REQUIREMENTS AT THE
CUSTOMER INTERFACE
In general all installations connected to ESB Networks are
metered.
There are, however, situations where this does not apply. Single phase
loads not exceeding 2kVA will be considered for unmetered
connections. At application stage ESB Networks will decide if the
connection is to be metered or unmetered.
The majority of special situation un-metered connections are for free-

standing street furniture (bus shelters, phone kiosks, traffic controls,
signs etc). The drawing below shows the typical connection sequence
for such installations. For preferred interface options see matrix on
page 53.
ESB ESB ESB 30mA RCD

Networks Networks Networks Switch Fuse Where required 3 Core SWA
Connection Cut-Out Isolator
Enclosure Earth Rod

ESB
CUSTOMER
Networks
• Some situations require the installation of RCDs.


TYPICAL APPLICATIONS OF SPECIAL
SITUATIONS LAYOUT
The list below shows the preferred option and acceptable alternatives.
See page 52 for electrical circuit requirements.
Unmetered
Type of installation Page 54 Page 55 Page 56
Advertising Hoarding ¡ ¡ ¡
Advertising Kiosks ¡ ¡ ¡
Bus Shelters ¡ ¡ ¡
Garda Cameras (CCTV) ¡ ¡ ¡
Ice Detecting Stations ¡ ¡ ¡
School Signs ¡ ¡
Telephone Kiosk ¡ ¡ ¡
Traffic Counting Stations ¡ ¡ ¡
TV Booster ¡ ¡
Water Metering Points ¡ ¡ ¡
Metered
Type of installation Page 57
Festive Lighting ¡
Mobile Comms. Sites ¡
Sewage Pumping ¡
Water Pumping ¡
Public Lighting Unmetered/Metered

Unmetered Pages 58 - 61
Metered Page 62
= Preferred Option = Other Options

SPECIAL SITUATIONS
(Unmetered)
Minimum Dimensions
ESB 150mm deep x 250mm wide x 600mm
high/above ground
Networks (Root depth: 320mm)
Equipment
Minimum opening size
220mm wide x 510mm high
Customer
Equipment Space requirements
ESB Networks: 125mm wide LHS
Customer: 125mm wide RHS
Equipment shown
ESB Networks Single Phase Cut Out
ESB Networks Single Phase Isolator
See page lX section 4 (b) for

requirements in relation to protection
against corrosion.
• Warning label “Live electricity” required on doors.

• 8mm triangular locks required on doors.
• Fire retardant back plate.
• Enclosure should have no sharp edges.

SPECIAL SITUATIONS
(unmetered)
Customer
Equipment
ESB Networks
Equipment
Dimensions (Minimum working envelope):

320mm High x 220mm Wide x 120 Deep
Equipment shown:
See page lX section 4 for requirements in relation to protection against
corrosion.

• Enclosure should have no sharp edges
• Suitable for Wall/Pole mounting

SPECIAL SITUATIONS
(Unmetered)
ESB
Customer
Networks
Equipment
Equipment

• Suitable for underground connections for use with cable vault.
• The Photograph shows an IP67 enclosure.
• Note the use of glands to maintain IP rating of cable entries

SPECIAL SITUATIONS
(Metered)
ESB Networks
Gland Plate Equipment
Drilled and Glanded
as req uired N.B. Outside enclosures
used for housing ESB
Networks’ equipment must
be either non-metallic,
stainless steel or hot dip
Trunking for
Networks Cable Customer galvanised and have a
Equipment Minimum IP44 rating.
(If required ) See specific requirements
Ground level 4 (b) page lX
Minimum overall dimensions:

500mm wide x 1250mm high x 225mm deep.
600mm Minimum to bottom of Meter.
Root depth 350mm
Minimum dimensions for ESB Networks equipment:
465mm wide 600mm high x 225 deep.
Note: Vertically hinged door for access to ESB Networks equipment.

• 8mm triangular locks required on hinged doors.
• Gland plate must be fitted to prevent moisture ingress and allow for
minimum dimensions for ESB Networks equipment
• Trunking to enclose Networks cables required
• Approved sealant must be installed in base of pillar.

SPECIAL SITUATIONS
PUBLIC LIGHTING
Customers Main Fuse

(25 Amp16kA
ESB Networks Isolator Breaking capacity)
ESB Networks Main Protective Conductor

Standard Cut-out
N Protective earth connected
In all situations, ESB
to frame of Service pillar
Networks cable will
terminate in ESB Networks
Main Earth Terminal
Cut Out. Service size will
be appropriate to
customer's requested
Maximum Import Capicity.
Connection from ESB Networks Mini-pillar Cable to column

Earth Electrode
There should be a separation of at least 2 metres

between the ESB Networks mini pillar and the
customer’s service pillar
The purpose of this requirement is to avoid conflict and ensure segregation between
the ESB Networks cable vault/ducts and the public lighting ducting e.g. the public
lighting circuits cannot pass through the mini pillar cable vault.
Note: This distance may be reduced if segregation is ensured. In this

situation the mini pillar and customer’s service pillar must be cross bonded.
• In all cases ETCI Rules will apply. Circuits shown are for example only.

Unmetered Public Lighting
Single Connection on Networks Pole
Customer
Equipment
ESB Networks
Equipment
Dimensions (Minimum working envelope):

320mm High x 220mm Wide x 120 Deep
Equipment shown:
See page lX section 4 for requirements in relation to protection against
corrosion.

• Enclosure should have no sharp edges
• Suitable for Wall/Pole mounting
Page 59
Latest code @
Single Phase Pillar
Minimum Dimensions
150mm deep x 250mm wide x 600mm
high/above ground
(Root depth: 320mm)

Space requirements
Equipment shown
ESB Customer ESB Networks Single Phase Isolator
Networks Equipment
Equipment

against corrosion.

Latest code @
Page 60
Three Phase Pillar
Minimum Dimensions
215mm deep x 370mm wide x 660mm
high/above ground
(Root depth: 360mm)

Space requirements
ESB Customer Equipment shown

Networks Equipment ESB Networks Three Phase Cut Out
ESB Networks Three Phase Isolator
Equipment

against corrosion.

Page 61
Latest code @
M etered P ublic Lighting
Three phas e/ S ingle P has e P illar
ESB Networks
Gland Plate Equipment N.B. Outside enclosures
Drilled and Glanded
as req uired used for housing ESB
Networks’ equipment must
be either non-metallic,
stainless steel or hot dip
galvanised and have a
Trunking for
Networks Cable Customer Minimum IP44 rating.
Equipment See specific requirements
(If required ) 4 (b) page lX
Ground level
Minimum overall dimensions:

500mm wide x 1250mm high x 225mm deep.
600mm Minimum to bottom of Meter.
Root depth 350mm
Minimum dimensions for ESB Networks equipment:
465mm wide 600mm high x 225 deep.
Note: Vertically hinged door for access to ESB Networks equipment.

• 8mm triangular locks required on hinged doors.
• G la nd pla te mus t be fitted to prevent mois ture ingres s a nd a llow for
minimum dimens ions for E S B Network s equipment
• Trunk ing to enclos e Network s ca bles required
• Approved s ea la nt mus t be ins ta lled in ba s e of pilla r.
Latest code @
Page 62
REQUIREMENTS FOR CONNECTION
AT MEDIUM VOLTAGE (MV)
In processing the application for connection the ESB Networks will, in
consultation with the customer, specify the voltage level of the connection
New loads in excess of 500kVA will in general be supplied at Medium

Voltage. Medium Voltage refers to 10kV/20kV. This document refers to
the standard connection requirements for 10kV/20kV.
If connection is to be made available at MV the following information will

facilitate the consultant / customer in pursuing the application for connection.
• The customer’s installation must comply with current S.I. requirements.

• ETCI requirements shall prevail.
• ESB Networks Specification 13320 “General Specification for MV
substation”. (available from ESB Networks)
• ESB Networks document: “Conditions Governing Connection to the
Distribution System for Medium Voltage Connections.” (available from ESB
Networks)
• ESB Networks Document “Medium Voltage - Dual Radial Supply.”
(available from ESB Networks)
The above ESB Networks documents list out ESB Networks requirements
relating to MV customers. In addition, please see required procedures on
following pages.

PROCEDURE:
A meeting to co-ordinate arrangements for energising the connection

shall take place at least 5 working days before connection is required.
Contractors involved in the construction and commissioning of the MV
equipment shall be represented at this meeting.
The following shall be provided to ESB Networks at least two working days
before energisation is required :
(a) Primary and Secondary Test Sheets for the Main Incomer Circuit Breakers
Protection Relays .
Primary tests to be completed on site.
(b) Confirmation of customers protection relay settings controlling the main
incomer circuit breaker. (as specified by local ESB Networks Design
office in terms for supply)
(c) Details of ratio of customer's protection CTs and protection relay type.
(d) Earthing has been installed as per requirements
(e) ETCI Completion Certificate.
(f) A declaration of fitness certificate for the MV installation that is to be
connected to the ESB Networks MV system.
This will normally be the final document given to ESB Networks
immediately before the connection is energised, and shall state
that the proposed MV system is fit for service from a safety, technical
and operations perspective.
OPERATION
In the interests of safety, access to the customer's medium voltage switch

room shall be restricted to competent personnel only.
Operation and maintenance of the customer's equipment shall be carried out
by fully trained and competent personnel.
The customer's switch panel shall indicate clearly the connection sequence of
all equipment connected to it.
A durable Single Line Diagram shall be mounted in the customer's
switch room in a prominent location. Operating procedures shall be agreed
between local ESB Networks and customer.

ESB NETWORKS EARTHING REQUIREMENTS
Earthing facility required on main incomer cable.
CABLE TERMINATIONS
The main incoming terminals to the circuit breaker shall be suitable for
terminating three single core cables, XLPE insulated and black PE
(polyethylene) sheath overall.
Customers shall confirm with ESB Networks the configuration and size
applicable to their particular installation.
The customer or his agent shall provide suitable terminating kits for connection
of the above cables to the main incoming terminals of the circuit breaker.
Adequate space shall be provided in the customer’s switch room to enable
ESB Networks staff to work on cable terminations.
METERING
Space shall be provided for the MD Metering Cabinet as indicated by ESB

Networks
LABELLING
The main incoming circuit breaker must have a permanent label affixed.
NOTE: There must be no possibility of interchanging incoming and
outgoing circuit labels.

10/20KV SINGLE TRANSFORMER
ESB Networks MV Substation Customer’s MV Switch room

ESB Networks MV Bus-Bar
MV Metering
Cubicle
Customer Owned
Custome r A Main Incomer C.B. Ma in L.T.C.B.
T.1
• Earthing facility required on main incomer cable
Latest code @
Page 66
10/20KV MULTI TRANSFORMER
ESB Networks MV Substation Customer’s MV Switch room
Main L.T.C.B.
Customers MV Bus-Bar
ESB Networks MV Bus-Bar
T.1
MV Metering
Cubicle
Main L.T.C.B.
Customer Owned
Customer A Main Incomer C.B.
T.2
Generator
Latest code @
Page 67
10/20KV DUAL RADIAL CONNECTION
Customers MV Switch room
MV Metering
Cubicle Main L.T.C.B.
Customer Owned
MV Feeder 1
Main Incomer C.B.
T.1
Custo mer Owned Co upler / C.B.
MV Metering
Cubicle
MV Fe eder 2 Customer Owned

Main Incomer C.B.
Main L.T.C.B.
T.2
Latest code @
Page 68
DECLARATION OF FITNESS FOR SERVICE
To: Distribution System Operator, ESB Networks
Customer Name : ___________________________________________
Address of Installation : ___________________________________________
: ___________________________________________
DETAILS OF INSTALLATION:
Reference No. (Job ID or MPRN.) _____________________

Connection Voltage _____________________
Number of circuit breakers (at connection voltage) _____________________
Length of cable (at connection voltage) _____________________
Number of Transformers (at connection voltage) _____________________
Other Equipment (at connection voltage) _____________________
Relay Settings (main incomer circuit breaker) _____________________
Generator installed capable of operating

in parallel with ESB Networks Distribution system Y/N _____________________
CERTIFICATION:
I certify that the MV electrical installation at the above address has been inspected and tested
and complies with the relevant requirements of the curent HSA S.I. document. I also confirm
that the installation complies with the Distribution Code and is fit for connection to the ESB
Networks System.
___________________________________________________________
Signature of Customers Contractor/Technical Representative.
___________________________________________________________
Name of Company and Position within Company.
_______________
Date.
Latest code @
http://www.esb.ie/esbnetworks/ncp Page 69
ADDITIONAL USEFUL INFORMATION
The following additional pages have been included in

these appendices in order to amplify the information
appearing in the main body of the code.
Appendix A: Typical design for installing a standard metering

enclosure
Appendix B: Standard design for surface mounted metering
enclosure on concrete plinth
Appendix C: Instructions for installation of commercial
temporary supply.
Appendix D: Instructions for installation of customer’s main
overcurrent device if mounted in standard outside cabinet.
Appendix E and F: ESB Networks contact numbers
Appendix G and H: ESB Networks AREAS/DIVISIONS

DESIGN FOR INSTALLING A STANDARD
METERING ENCLOSURE FLUSH MOUNTED
ON A CONCRETE PLINTH
Latest code @
http://www.presb.ie/esbnetworks/ncp Appendix A
DESIGN FOR SURFACE MOUNTED
METERING ENCLOSURE
ON A CONCRETE PLINTH
Latest code @
http://www.presb.ie/esbnetworks/ncp Appendix B
COMMERCIAL TEMPORARY SUPPLY
Latest code @ Appendix C

MAIN OVERCURRENT DEVICE MOUNTED
IN STANDARD METER CABINET
N.B. If the main overcurrent device is located within the standard meter cabinet, it shall
comply with the following requirements:
• In the case of installations with a maximum import capacity of less than 50kVA an MCB
rated not less than 63A and having a multiple-operation short circuit breaking capacity
of at least 9kA rms.
• The MCB shall be housed in an non conducting (self extinguishing 750º C)
weatherproof enclosure rated IP55 min.
• A hinged transparent cover (IP55 min) shall give access for operating the MCB but no
access to live terminals without the use of a tool.
• The enclosure shall be mounted only in the bottom right hand side of the meter cabinet
as shown above to allow the further possibility of mounting additional equipment by the
DSO as the need may arise.
Latest code @ Appendix D

ESB NETWORKS CONTACT NUMBERS
Latest code @ Appendix E

ESB NETWORKS CONTACT NUMBERS
Latest code @ Appendix F

ESB NETWORKS AREAS/DIVISIONS
Latest code @ Appendix G

ESB NETWORKS AREAS/DIVISIONS
Latest code @ Appendix H


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National Code of Practice at Customer Interface Modification Log

Date of modification Page Nature of modification

Latest code @ Page II

It is a consensus document agreed between people involved in the electrical industry

Contractors Associations, Consulting Engineers, Switchboard Assembler's, Electrical

It is important that everyone working at the ESB Networks/Customer Interface or

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• Contractors, Builders, Developers and ESB Networks must meet

• Electrical Contractors and ESB Networks staff should always be

• Part icular attention is required when an installation is made live

• Always make sure if you make an installation or part of an

• Always check for absence of voltage before you work on any

Remember the Five Electrical Safety

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THE CERTIFICATE SHOULD ONLY BE ISSUED AT THE COMPLETED

It is essential that the correct MPRN (Meter Point Reference Number)

• All new installations/re-wires requiring connection to ESB Network

• All alterations to existing installations involving changes to the wiring

• In multi-tenanted / multi-metered situations a completion certificate is

• All Medium Voltage installations require a completion certificate (Note a

• A completion certificate is required before connection will be restored to an

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• It is important to contact the local ESB Networks supervisor at an early

• Afterwards the fully completed certificate should be sent (without delay) to

Any contractor working in close proximity to live ESB Networks sealed

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1 CONSULTATION WITH ESB Networks OFFICE

(b) Extensions/Renovations to Existing Metering:

3 ENCLOSURES FOR METERING EQUIPMENT

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9 ESB Networks SEALS

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15 MAIN PROTECTIVE CONDUCTOR CONNECTION (NEUTRALISING)

16 MAIN CONNECTION POINT

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17 ACCESS TO ESB Networks EQUIPMENT ON CUSTOMER’S PREMISES:

18 REMOTE READING OF METERING EQUIPMENT:

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• Installed flush with wall to a depth of 103mm

COLOUR CODING USED THROUGHOUT BOOK

SUPPLIED BY ESB NETWORKS SUPPLIED BY CUSTOMER

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From finished ground level

1.2m Max. 1M min.

Water drain hole in the lowest s ection of the pipe.

10mm draw-in rope (free of knots) to draw

New inlet pipe

CROSS SECTION VIEW

1.2 M Max. 1M Min.

Meter Relocation / Service Alteration

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Tails from customers

All cables to enter the