Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
A. Standard sizes of stranded copper conductor used for Grounding continuity
shall be according to the requirements of IEE Wiring Regulations, 16th Edition..
B. Suitable Grounding facilities, acceptable to the Engineer, shall be furnished
on electrical equipment to consist of compression type terminal connectors bolted
to the equipment frame or enclosure and providing a minimum of joint resistance.
C. The conduit system shall not be considered as continuous for Grounding
purposes. A separate Grounding conductor shall be installed in the same conduit
with the phase and neutral conductors. The separate Grounding conductors shall be
sized according to IEE Wiring Regulations, 16th Edition. requirements. No
Grounding conductors shall be smaller than 2.5 mm2 unless this is part of a
multicore cable. Where flexible connections are made to equipment, Grounding
jumpers shall be provided. All connections of heavy gauge steel conduit system shall
be checked for good electrical continuity.
D. Exposed conductors shall be installed inconspicuously in vertical or
horizontal positions on supporting structures. When located on irregular supporting
surfaces or equipment, the conductors shall run parallel to or normal to the
dominant surface.
E. Conductors routed over concrete, steel or equipment surfaces shall be kept in
close contact with those surfaces by using fasteners located at intervals not
exceeding 1 m.
F. Exposed Grounding conductors shall be securely fastened to the mounting
surface using copper or brass straps.
G. Clamps, connectors, bolts, washers, nuts and other hardware for bolted
connection to Grounding system shall be of copper.
H. Exothermic welds shall comprise moulds, cartridges, materials, and
accessories as recommended by the manufacturer.
I. The Grounding conductors entering the building shall be installed in a 25 mm
diameter PVC conduit. Waterproofing shall be provided at all entry of Grounding
conductors, details of which shall be approved by the structural engineer.
J. Grounding conductors shall be buried at a minimum depth of 750 mm below
finished grade.
K. Underground conductors shall be buried in clean sifted Grounding.