SECTION 16060 Grounding and Bonding Rev 0
SECTION 16060 Grounding and Bonding Rev 0
SECTION 16060 Grounding and Bonding Rev 0
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SECTION 16060:
KINGDOM
OFSAUDIARABIA ~~~1 4J.}!J1
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RoyalCommissionfor Jubail & Yanbu cw.4~~1~1
SECTION 16060
GROUNDING AND BONDING
TABLE OF CONTENTS
PART 1 GENERAL............................................................................................................ 1
1.04 REFERENCES..................................................................................................... 2
1.05 SUBMITTALS....................................................................................................... 3
PART 1 GENERAL
A. This Section specifies the minimum technical requirement for design engineering,
manufacture, inspection, testing and performing of grounding system using bare
copper or insulated copper conductor and bonded copper or copper clad steel
ground rod as indicated on Contract Drawings and Documents.
1. To provide low fault impedance to the ground fault currents for prompt and
consistent operation of protective devices during a ground fault, and to limit
potential rise of electrical equipment.
2. To stabilize system neutral potential only for the system with neutral
grounding.
3. To provide means to carry electric currents into the ground under normal and
fault condition without exceeding any operating and equipment limits or
adversely affecting continuity of services.
4. To assure that a person in the vicinity of grounded facility is not exposed to the
danger of critical electric shocks.
A. Grounding Connections
B. Grounding Rods
1.04 REFERENCES
A. The following codes and standards are intended to provide an acceptable level of
quality for materials and products. In case of conflict between these standards and
the text of this Specification, the Specification text shall govern.
B. The latest revision of the following codes and standards shall be used wherever
applicable. In case of conflict, the Contractor shall propose equipment conforming to
one group of codes and standards.
1.05 DEFINITIONS
A. bonding: The permanent joining of non-current carrying metallic parts and or circuit
conductors intended to be grounded to grounding conductors to ensure a reliable
electrically conductive path to ground, which will provide electrical continuity and the
capacity to conduct safely any current likely to be imposed.
C. cable bond: An electric connection across a joint in the armor or lead sheath of a
cable, or between the armor or sheath of adjacent cable.
F. ground electrode: A bare cable, ground rod, plate, or groups of these in intimate
contact with the ground for the purpose of providing a connection to a ground.
1.06 SUBMITTALS
A. The Contractor shall submit to the Royal Commission, under the provisions of
SECTION 01330, the following items for review and approval before commencing
Work:
1. All vendor drawings and products data sheets and Specifications shall be
generally provided as defined and particularly as listed below:
a) List of Manufacturers.
g) Certificates of compliance.
B. The Contractor shall submit Field Test Reports after completion of testing and
commissioning.
A. The Contractor shall be responsible for the quality of work and shall develop and
propose programs and methods of construction and testing such as to achieve the
specified quality to the approval of the Royal Commission in accordance with
SECTION 01450.
3. Contractor
B. In the absence of any of the above, best accepted industry practice shall be
employed throughout.
A. General
1. All the Grounding Conductors and Grounding Rods shall be tested at the
factory in accordance with the latest approved manufacturing codes and
standards. The Contractor shall notify to the Royal Commission in writing not
less than 30 days prior to the scheduled starting date of the factory tests.
2. The Royal Commission reserves the right of deputing their representative for
witnessing the factory tests.
A. All the Grounding materials installed indoors shall be suitable for continuous
operation under the following service conditions:
a) A maximum of 40°C.
b) A minimum of 0°C.
B. All the Grounding materials installed outdoor shall be suitable for continuous
operation under the following service conditions:
a) A maximum of 50°C.
maximum of 45°C.
A. The Contractor shall deliver, handle and store materials and equipment in
accordance with SECTIONS 01650 and 01660, as well as the following
requirements:
PART 2 PRODUCTS
2.01 GENERAL
A. All goods and products covered by this Specification shall be procured, when
available from an in-Kingdom manufacture. However procurement of all goods and
products manufactured out-of-Kingdom or in kingdom must be approved by the Royal
Commission.
A. Following are the types of grounding connections which shall be commonly used in
industrial and commercial grounding systems:
1. Mechanical Connections.
2. Compression Connections.
3. Exothermic Connections.
B. Mechanical Connections
3. For outdoor equipment or structures above grade, joints of pigtails with the
respective connectors shall be compression (Lug) type and the connectors in
turn shall be bolted to the respective equipment.
C. Compression Connections
2. The installation of the connectors shall be made with a compression, tool and
die system, as recommended by the manufacturer of the connectors.
D. Exothermic Connections
2. Exothermic welded joints shall be used on buried ground grids (cross over
points etc) which make the connections as integral part of the homogenous
conductor.
3. All joints that are part of the ground grid net work shall be exothermic.
4. All exothermic connections shall be bit mastic painted and mastic taped.
A. General
1. The bare copper/copper clad steel ground rods shall meet or exceed the
requirements of relevant standards as specified in par. 1.04.
2. The bare copper/copper clad steel ground rod shall have a minimum diameter
of 16 mm or as per design calculations and a minimum length of 3 m. The
ground rod shall be of sectional type equipped with suitable couplings and
driving studs.
3. The material of ground rods shall have a pure copper covering, permanently
joined to a high-strength steel core. The steel core shall have sufficient rigidity
for easily driving into ground with hammer or mechanical drivers.
4. The minimum thickness of copper covering for copper-clad ground rod shall
not be less than 0.25 mm.
5. The actual diameter of the copper-clad steel rod shall not be less than
14.3 mm (unthreaded) or as per design calculations.
A. General
c) The nylon and insulation thickness shall also meet the requirements of
UL 83.
d) The insulation is acceptable for use in locations at 90°C dry or 75°C wet.
2. Each end of the bare soft annealed copper grounding conductor in the reel
shall bear a non-corroding tag identifying the following:
e) Stranding.
3. Each reel shall be stenciled to show all information as specified in par. 2.04.
B. 2. plus additional information as follows:
b) Year of Manufacture.
c) Serial Number.
d) Size of Reel.
e) Gross weight.
f) Consignee Address.
g) Direction of Rolling.
C. Conduits
D. Test Wells
1. The Contractor shall furnish optional grounding test wells in accordance with
the Contract Drawings and Documents, either concrete reinforced or readily
available approved test wells. The well cover shall be cast iron or hard plastic
with legend “GROUND ROD” or “EARTH ROD” embossed on cover. Refer to
SECTIONS 02580 and 02080.
2. Before installation of any type of test wells, the Contractor shall take an
approval from the Royal Commission.
PART 3 EXECUTION
3.01 GENERAL
A. The Contractor shall provide all materials, equipment and labor as deemed
necessary to show proper execution of the Work.
A. General
3. All equipment moved to the site shall be inspected for damage or deterioration
during storage.
B. Installation
5. Screws and bolts for grounding and bonding connectors and terminals shall be
tightened according to torque-tightening values specified in UL 486A, or as per
the manufacturer’s recommended values.
9. Each grounding rod shall be driven vertically in the earth up to the depth not
less than 3000 mm. Where permanently concealed ground connections are
required, make the connections by the exothermic process to form solid metal
joints. Make accessible ground connections with listed grounding connectors.
10. Ground rod shall be installed with their top, 500 mm minimum below grade and
bonded to the grounding conductor or grid by thermo weld process as
indicated on the Contract Drawings and Documents.
11. Prior to backfilling, the installation of the ground rods shall be accomplished.
13. If the grounding resistance values exceed 5 ohms, the Contractor shall install
additional ground rods as required to achieve specified resistance. Before
installation of these ground rods at indicated locations, the Contractor shall be
required to take approval by the Royal Commission.
14. Shielded power cables shall have its ground wire at each termination in a
manner recommended by the cable manufacturer and the grounding
connection shall be made in accordance with the Contract Drawings and
Documents using the suitable connectors.
16. The lightning protection system shall be bonded to the electrical grounding
electrode system in accordance with the code as specified in par. 1.04.
18. Types and sizes of the grounding and bonding conductors, if not indicated on
the Contract Drawings and Documents, shall be selected from relevant codes
and standards as specified in par.1.04.
3. Cables
5. Metal Buildings
9. Lightning Masts
a) All oil tanks shall be grounded at two points with bolted cable
connections to two different points of the grounding grid. Oil piping shall
be grounded at intervals of 12 m. Runs shorter than 12 m shall be
grounded at least at two points.
a) Metal Clad Switchgear shall have two safety grounds connected to the
switchgear grounding bus. Withdrawable circuit breakers and PTs shall
be provided with reliable connection to the ground bus. Grounding via
the roller wheels and the rail is not acceptable.
a) All the components used for temporary protective system shall be sized
as per calculation. All other requirements of temporary grounding shall
b) Power Transformers
1) Power transformer tanks shall be safety grounded at two points
diagonally opposite to each other. These connections shall be
made from two different points of the grounding grid.
2) A separate system ground shall be provided for the neutral of the
transformer by means of 2 stranded copper wires. The neutral
copper wire shall be sized for the system fault level.
3) The neutral grounding wires shall be insulated from the
transformer tank by support insulators mounted on the tank wall
and shall be connected to the grounding grid directly.
4) Independently mounted radiator bank and Low Pressure Oil
Field/Cross Linked Polyethylene (LPOF/XLPE) cable termination
boxes shall be separately grounded at two diagonally opposite
locations.
5) Tertiary windings and stabilizing windings shall be grounded per
IEC 60076-3, Annexure B.
c) Instrument Transformers
1) Potential and current transformers shall have their metal cases
grounded.
2) The grounding terminal of the potential transformers shall be
connected to the grounding grid. The neutral point of the
secondary connections of potential and current transformers shall
be grounded to the ground grid in the control/relay room instead
of switchyard to reduce the transient over-voltages. Other
requirements of instruments transformer grounding shall be as per
IEEE C57.13.3.
d) Surge Arresters
1) Where surge counter and leakage current indicating meters are
installed, a 5 kV insulated cable shall be used between arrester
ground terminal and surge counter/meter. The surge monitor's
ground terminal shall be connected to the ground grid via two 240
sq mm stranded copper conductors.
2) The system ground conductor shall be as short as possible, free
of sharp bends, and shall not be installed in metallic conduit. In
addition, ground rods shall be driven adjacent to the arrester
f) Shunt Capacitors
1) Shunt capacitors are considered safety grounded when mounted
on a metal structure that is connected to the grounding grid. One
system ground conductor shall be connected to the grounding grid
when the capacitors are to be connected in a grounded star
configuration.
1. General
2. Communication Circuits
3. Rails
a) All metallic utility pipes and other metallic pipelines such as rain water
pipe lines shall always be tied to the substation's grounding system. To
ensure that Ground Potential Rise (GPR) is not transferred outside the
substation plot area, all metallic utility pipes and other pipelines
emanating out of the substation shall be provided with insulated
connection at the point of leaving the substation. Necessary proposal
shall be submitted to Royal Commission for approval.
5. Auxiliary Buildings
6. Portable Equipment
1. Duct Bank
a) Ground rod shall be installed close to wall and shall be set to a depth so
that 100 mm will extend above finished floor. The ground rod shall be
connected to grounding bar inside the manhole by bare copper
conductor. The bare copper conductor shall enter the manhole through
a waterproof sleeve in manhole wall. Size of the conductor shall be as
specified on the Contract Drawings and Documents.
a) Exposed metal parts, such as inserts, cable racks, pulling irons, ladders,
and cable shields within each manhole or hand hole shall be connected
to ground bar inside manhole shall be connected to ground rod or
grounding conductor.
A. General
1. The Contractor shall carry out all site tests in accordance with approved test
procedures, codes and standards as specified in par. 1.04. Ensure that the
grounding equipment/materials comply with the specifications and operational
requirements. All tests are subject to witnessing by the Royal Commission
representatives.
2. At least 4 weeks prior to schedule tests, the Contractor shall submit to the
Royal Commission an outline of the plan and procedures to be used in
performing the site inspection and site tests.
3. This outline shall include a brief description of the test equipment, connection
diagrams, proposed tests and procedures, test sheets, calculations, reference
drawings and minimum and maximum test and performance values, in
conformance with this specification and acceptability of the equipment and its
installation.
6. Upon completion of all field testing, the Contractor shall submit to the Royal
Commission 5 copies of a certified test reports attesting that each test has
been performed in accordance with the approved test procedures. The report
for each test shall include the name of the person in charge of the test and the
date of performance. All factory and field test reports shall be included in
Operation and Maintenance Manuals.
7. All the necessary safety precautions shall be taken during field testing, for the
test equipment as well as the persons.
END OF SECTION