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
MAIN DISTRIBUTION EQUIPMENT
PART 1 – GENERAL
1.01 DESCRIPTION
A. The main distribution equipment shall comprise main low tension switch
boards, switching metering panels, main and sub-main switch boards,
distribution boards, isolators, switch fuses ...etc.
B. The supply and distribution arrangement shall be as indicated on
schematic diagrams in the Drawings.
C. The equipment shall be assembled and tested in the factory of the
approved local panel builder/manufacturer. Where any equipment need to
be assembled at site, a prior approval of the engineer would be necessary.
D. Before placing any order for the supply of equipment, it shall be ensured
that the physical sizes of equipment when installed shall not infringe any
clearance required by the concerned local authorities regulations. Where
no such regulation is available IEEE regulations shall be applied.
E. The contractual responsibility for the supply and installation shall be as
indicated on drawings.
1.02 REFERENCE STANDARDS
Switchboards and Motor Control Centers shall comply with the following as
appropriate. Where no regulation / standards are mentioned latest IEC standards
shall be applicable.
BS 88 Cartridge Fuses
BS142 (Latest) Electrical Protective Relays
BS 159 Bus bar & Connections
BS 162 Electrical Power Switchgear
BS 3938 IEC 185 Current Transformers
BS 4794 IEC 337-2 Control Devices
BS 5685 Electricity Meters General
BS 89 IEC 51 Direct Acting Indicating Electrical Measuring Inst.
BS 5685 IEC 521 Electric Meters
BS 5420 IEC 144 Degree of Protection of enclosures
BS 4752 IEC 947-2 Switchgear & Control Gear
IEC 947-4 Contactors