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
CABLES AND WIRES
PART 1 - GENERAL
1.01 All cables shall be designed for operation in systems where continuity of supply is
the first consideration. They shall also be satisfactory in operation under the
variations of current, voltage and frequency as may be met under fault and surge
conditions on the system.
All materials shall be of the best quality and of the class most suitable for working
under the particular condition of the systems. They must be capable of
withstanding the normal variations of temperature and service conditions without
disturbance or deterioration.
In general, cables and wires shall conform to the international standards and to the
concerned local authorities Specifications.
1.02 CONDUCTORS
The conductors shall be high conductivity copper, stranded for power cables and
solid for control cables' according to the type of insulation, the copper conductors
will be plain or tinned.
1.03 Cables shall be installed on cable trays or on building structure as indicated on the
Drawings. They shall be neatly fixed in straight lines. On cable trays, cables
shall be fixed by cable clips or ties while, on building structure cable cleats shall
be used. The spacing of cable supports shall be as indicated in I.E.E. Regulations
table B.2M. The minimum radius of bends for cables shall be in accordance with
table B.1M of the regulations with bends made neatly and uniformly.
1.04 Where single core cables are used for feeders, care shall be taken to ensure equal
division of current among cables which shall be arranged in trefoil formation.
1.05 Proper cable glands of non ferrous material shall be used for cable entries into
distribution boards and equipment.