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

Sharp and tight bends shall be avoided. Each wire shall be identified at both ends
by ferrules indicating the designation of the wire in accordance with the
schematic/wiring diagrams. The wire shall be terminated on the terminals of the
relays, switches, instrument, conductors, lamps etc., or on the terminal blocks as the
case may be. No joints shall be provided in between. Terminal blocks shall have
screw type terminals which can take at least two wires per terminal on each side.
At least 20% spare terminals shall be provided on each terminal block.
Interlocking Arrangement:
The panels containing the MCCB/MCB etc. shall be enclosed in free standing steel
sheet enclosure with front cover so interlocked with the isolator that the door cannot
be opened with isolator at ‘ON’ position.
Inspection of Circuits:
Facility for inspection of the circuits, to ascertain if all the conductors, relays, fuses,
etc. are in proper working order/condition or otherwise shall be provided by means
of a push button or selected switch.
Labeling:
Labels of switch gears shall indicate reference number of the switch, the specified
current rating and the part of the distribution controlled. Labels on circuit breaker
boards shall indicate the reference number of controlling switch. The lettering of all
labels shall not be less than 5 mm, high. The schedule and details of the labels shall
be submitted to the Engineer for approval.
Cable entry:
The cable entry shall preferably be from the bottom which shall be dust and vermin
proof. The cable entry on each equipment shall be through a compression type
cable gland. The cable gland plate shall be sufficiently strong to take the load of the
cables and shall be mounted not less than 300 mm. above the floor level. The
cables shall be suitably clamped before the cable gland to avoid any strain on it.
GTS : General Technical Specification. Page 110