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

All spare contacts and terminal of panel mounted equipment and devices shall be
wired to terminal blocks.
At least 20% spare terminal shall be provided on each panel, uniformly distributed
on all terminal blocks.
Indicating Instruments :
All electrical indicating instruments shall be digital square type of 144 sq.mm or
96 sq.mm according to the suitability of panel. These shall be suitable for flush
mounting with only flanges projecting on vertical panel. Instrument dial shall be
white with black numericals and lettering.
Instrument shall conform to IS:1248 and shall have accuracy class of 1.00 or better.
The current coil of ammeters and potential coils of voltmeters shall continuously
withstand 120% of rated current and voltage, respectively, without the loss of
accuracy.
The meters shall have external zero adjustments. The ammeters fitted in the motor
circuits shall have suppressed scale to indicate the maximum starting current. The
instrument shall be provided with glass cover to avoid the possibility of
measurements due to static charge.
The three phase three wire trivector meter shall comprise of kWh meter and kVARh
meter mounted together with kVAh meter in one case with special summator
mounted between them to register correct kVAh at all power factors.
All the meters shall have respective maximum demand indicators to record the
average power over a period of half an hour. The trivector meter shall conform to
relevant IS.
Equipment wiring :
All the switch boards, panels, annunciator panel and mimic panel shall be neatly
wired using 1100/660 volt grade PVC insulated stranded copper conductor cable of
minimum 2.5 mm to suit the requirement. The wiring shall be bunched in groups
by non-metallic clips or bands. Each group shall be adequately supported along its
run to prevent sagging and strain on the terminals.
GTS : General Technical Specification. Page 109