Electrical
Installation
Distribution
Board
A.C Permanent Distribution Board
Main lighting board with enough capacity and 25% spare equipped feeder shall be provided, C.B selected to be adequate for the load including the 25% spare feeder.
It shall be flush/semi flush-mounted in the A.C
room/control room. This board shall feed sub-distribution boards located in
different areas for local control of the lighting.
L.V. sub-distribution boards with rated insulation level 1000 V.
it shall be flush mounted metal-clad assembly enclosure design with thickness not less than 1.5mm with lockable front door and in accordance with IEC 439 with a degree of protection IP54, the board shall be provided with a copper busbar and circuit breakers with the required rated current,
breaking capacities and also provided with indication lamps.The main circuit breaker shall be provided with an earth leakage relay to initiate a sound alarm and visual the signal on the board. Separate neutral and also separate protective earthing busbar with the same cross-section of the phase busbar,
the neutral busbar shall be isolated from the enclosure of the board but shall be connected to protective earth with one link in the board only the protective earthing wire shall be connected to the main grounding system.
Only one conductor maybe
connected to one terminal, adequate space on the board for the connection of
cables shall be provided.
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