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
M. The switch boards shall contain the air circuit breakers, bus bars, bus
couplers, MCCBs, instruments, earth bus, ...etc. as specified here under
and as per drawings with ratings and arrangement as shown on the
Drawings and shall be complete with all internal wiring and connections.
N. The switch boards shall be tested at the manufacturer’s premises as well as
commissioned after installation in accordance with tests stipulated in IEC
439.
O. Additionally, Main Low Tension Switch Board shall comply with the
concerned local authority’s requirements.
2.02 BUSBARS
A. The switchboard shall be provided with fully rated Bus bars for the entire
width of the board. In addition, each section or panel of the switchboard
shall be provided with vertical busbars of adequate rating to provide
branch connections to the outgoing breakers.
B. The horizontal and vertical bus bars and connection shall be fully
segregated such that these shall not be accessible when the compartment
doors and cable way covers are opened. They shall be provided with
barriers which are removable by tool or special key.
C. The bus bars shall be made of electrolytic, hard drawn high conductivity
flat pure tinned copper bars complying with IEC Standard. The whole bus
bar system shall comply fully with the requirement of latest IEC standards.
D. The bus bars shall be air insulated and shall be rigidly supported on
purpose made insulators of non-hygroscopic glass fiber moldings having a
tracking index of not less than 600.
E. The Main Low Tension Panels (MLTPs) busbar together with its
connections to the incoming and outgoing unit shall be suitable to
withstand a short circuit of 50,000 sym. amperes and in all other cases; it
shall be suitable for the fault level at that point.