PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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Air Circuit Breakers:<br />
The medium voltage cubicle type switch board shall consist of four pole Air Circuit<br />
Breakers confirming to latest revision of IS:13947 Part 2/IEC:60947 Part 2. The<br />
breaker shall be manually draw out type in open execution with over current trip<br />
device adjustable 64% to 110%. Time setting for over load, adjustable current<br />
setting for short circuit protection and also earth fault protection adjustment facility<br />
shall be provided in the ACB.<br />
ACB shall be fitted with following :<br />
- Heavy duty switch having not less than 4 No. + 4NC contacts<br />
- Built in resin cast current transformer<br />
- Auxiliary contacts<br />
- Shunt and under voltage tripping device<br />
- Neutral CT for earth fault protection<br />
- The ACB shall be suitable for locking the breaker in various position. Provision<br />
for door locking ACB shall be provided with the requisite end termination<br />
lugs/sockets. Terminal bars for connecting more than one terminal.<br />
The ACB shall have breaking capacity not less than 35kA at 415V AC.<br />
Moulded case circuit breakers:<br />
Moulded Case Circuit Breakers confirming to latest revision of IS:13947<br />
Part 2/IEC:60947 Part 2 shall be fixed type fitted with trip free, manually closing<br />
mechanism, accommodated in a sheet steel housing of robust and vermin proof<br />
construction matching with switch boards. All MCCBs shall be tested as per<br />
IS-2516 Part-1, Sec-1 and shall be provided short circuit and overload protection.<br />
(position of the knob shall clearly indicate ON, OFF and TRIP conditions).<br />
Terminal Blocks:<br />
Terminal blocks shall be 650 V grade, 10 Amps., rated one piece moulded,<br />
complete with insulated barriers, screw type brass terminals suitable for stacking on<br />
C type rail and identification strips. Marking on the terminal strips shall correspond<br />
to wire numbers on the wiring diagrams. The terminal blocks for CT and VT<br />
secondary leads shall be provided with test links and isolating facilities. Also CT<br />
secondary leads shall be provided with short circuiting and earthing facilities.<br />
GTS : General Technical Specification. Page 108
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