790 لوحات التوزيع

790 DISTRIBUTION BOARDS

790-1 Distribution boards shall be housed in purpose made heavy guage, rust -proofed sheet' steel housing.
The distribution boards shall be so installed th at its top does not exceed 185 c ms from finished floor level.
Alternatively they may be housed in non -metallic enclosures provided the material employed is fully suitable
for use in the climatic conditions and has the required insulation level.

790-2 Distribution boards having fuses or circuit breakers in the phase lead only shall not be controlled by
any other switch having a fuse or circuit breaker in the neutral lead.

790-3 Each distribution board shall have a circuit schedule pasted or otherwise permanently fixed inside the
cover or adjacent to the board stating what each way controls and the size or rating of the fuse or circuit
breakers to be used. All such schedules shall be in both Arabic and English.

790-4 Where multi -phase circuits are connected to a distribution board, the corresponding fuse or
circuit breaker in each phase shall control the same circuit.

790-5 Each phase of every distribution board shall have an adequate busbar of high conductivity
electrolytic copper to distribute the electricity to the various circuit fuses or circuit breaker. Such busbar shall
be provided with an adequate terminal or clamp to take the incoming main conductor.