PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

All markings required under this rule shall be clear and permanent.
All distribution boards shall be marked ‘Lighting’ or ‘Power’ as the case may be
and also marked with the pressure and number of phases of the supply. Each shall
be provided with a circuit, diagram and the current rating of the circuit and size of
the fuse element.
Main and branch distribution boards and their locations:
Unless otherwise specified in the special specification main and distribution fuse
boards shall be the metal clad type.
Main distribution Boards shall be controlled by a linked fuse unit and a circuit
breakers. Each outgoing circuit shall be provided, of MCB with SP/TP as per
requirement
Branch Distribution boards shall be controlled by a MCB. Each outgoing circuit
shall be provided with a fuse or MCB. The earthened neutral conductor shall have
provision for disconnecting individually for testing purpose. At least one spare
circuit breaker of the same capacity shall be provided on each branch distribution
board.
Capacity of circuits:
Lights and fans may be wired on a common circuits, such circuit shall not have
more than a total of ten points of light, fan and socket outlet or a load or 800 watts
whichever is less.
Power circuits on buildings shall be designed with a maximum of two outlets per
circuit, based on the loading.
Where, not specified the load shall be taken as 1 kW per outlet. Wherever the load
to be fed is more than 1 kW it shall be controlled by an isolator switch or miniature
circuit breaker.
Passing through walls:
When conductors pass through walls, any one of the following methods shall be
employed. Care shall be taken to see that wires pass very freely through protective
pipe or box and that wire pass through in a straight line without any twist or cross in
wires, on either ends of such holes.
GTS : General Technical Specification. Page 124