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

Drawings:
All wiring diagrams shall indicate clearly in plan, the main switch board, the
distribution fuse board, the run of various mains and sub-mains and the position of
all points with their classification
Cables:
All cables shall conform to the relevant Indian Standard. Conductors of all cables
except the flexible cable shall be of aluminum.
The smallest aluminum conductors for the final circuit shall have a nominal crosssectional
area of not less than 2.5 sq.mm. The minimum size of aluminium
conductors for power wiring shall be 4 sq.mm. (1/2.24 mm).
Rating of Lamp, Fans, Socket outlet points and Exhaust fans:
Incandescent lamps installed in pump house & other means shall be rated at
60 watts and 100 watts respectively.
Table fans and ceiling fans shall be rated at 60 watts. Exhaust fans shall be rated
according to their capacity.
5 Amps. socket outlet points and 15 amp. socket outlet points shall be rated at
100 watts and 1000 watts respectively, unless the actual values of load are known or
specified.
Joint and Looping Back
Unless otherwise specified, the wiring shall be done in the “Looping System”.
Phase of live conductors shall be looped at the switch box and neutral conductor can
be looped from the light, fan or socket outlet. In non-residential buildings, neutral
conductor and earth conductor and earth continuity wire shall be brought to each
switch board situated in room and halls. These shall be terminated inside the switch
boards with suitable connectors and the switch board shall be of adequate size to
accommodate one number 5 amp. socket outlet and control switch in future.
GTS : General Technical Specification. Page 122