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
G. The earth bus shall have adequate rating and length for connecting the
incoming and outgoing earth wires or tapes.
H. The distribution boards shall be complete with all necessary internal
wiring and connections
J. High conductivity copper bars or rods covered by coloured PVC sleeving
for phase identification shall be employed for connections of 200A and
higher. For smaller connections PVC insulated cables to B.S. 6231 shall
be used with coloured insulation for phase identification.
K. The arrangement of the boards shall be such that the main isolator and
MCCBs can be operated when opening the door but to gain access to the
MCCBs, cabling and terminations a second cover should be removed.
There shall be ample clearance and ample space available inside the
boards for cabling and terminations. Adequate clearance shall be
maintained between phases and non-current carrying metal and terminals
shall be so located that in the final connected positions there shall be no
crowding of wires in close proximity of metal.
L. The boards shall be complete with cable glands for convenient
terminations of incoming and outgoing cables. The cable glands shall be
so fixed inside the board that ample clearance exists between various
feeders.
2.12 M.C.B. DISTRIBUTION BOARDS
A. MCB distribution boards shall comprise of a totally enclosed dust and
vermin protected, factory fabricated heavy gauge sheet steel enclosure of
2mm thickness and door of 1.5mm thickness and of ample size with a
hinged door and approved fastening device. The enclosure shall contain an
isolating switch, adequately rated busbars for phases, neutral connector
blocks, earth terminal block and single or triple pole miniature circuit
breakers with ratings and arrangement as shown on schedules. DB
enclosures shall be suitable for 18 or 24 or 36 SPN ways, has the case
may be. HRC fuses shall be provided in MCB Distribution Boards where
fault level exceeds 6KA.