Specifications

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
EPI – New Delhi Volume-2B, Rev.0 Page 53 of 63
4.0
Neutral Busbar
Rating
50 % of phase busbar rating
5.0 Short circuit rating 50 KA for 1 sec.
6.0 Busbar
configuration
Red-yellow-blue from front to back or top to bottom or
left to right as viewed from front.
7.0 Busbar insulation Heat shrinkable PVC -R,Y,B coloured sleeves for phases
-Black for neutral.
8.0 Busbar supporting
insulators
-Non-hygroscopic -Flame retarded -Track resistant -High
strength -Sheet moulded compound or equivalent
polyster fibre glass moulded type .
9.0 Max. temp. rise of
bus
Not to exceed 35 deg. C. above ambient of 50 deg.C.
10.0 Air clearance for
bare busbar
Phase to phase :25.4 mm (minimum) Phase to earth
:19.0 mm (minimum)
11.0 Joints and tap off
points
-Busbar joints and tap off points shall be shrouded and
bolted ( with cadmium coated bolts with plain and
spring washers and locknuts). -Bimetallic connectors for
connection between dissimilar metals . -Antioxide
grease for all bus connections
12.0
Neutral bus
isolation
Through disconnecting link .
13.0 Busbar access Rear side
(ii) Earth bus
1.0 Material GI.
2.0 Size Minimum 50 x 6 mm with extension at both ends.
(iii) Control bus
1.0 Material Copper.
2.0 Size Minimum 25 x 3 mm .
D. Insulation level
1.0 Rated insulation
voltage
1100 V
2.0 Impulse withstand
voltage
4 KV as per IS-13947 (Part I) 1993
3.0 One minute power
frequency
withstand voltage
2.5 KV for power circuit & 500 V for control circuit
E. Pollution Degree
1.0 Pollution Degree Pollution Degree 3 as per IS-13947 (Part-1) : 1993 ;
unless otherwise stated
F . Components
1.0 Isolating
Equipment
3 pole MCCB (upto 630A)
2.0 Indication Lamps LED type indicating lamps for :-MCCB ON/OFF/TRIP. -
Power ON R / Y / B .
3.0 Meters and selector
switches
-96 sq.mm size voltmeter with 7 position selector
switches -96 sq.mm size ammeter with 4 position
selector switches
4.0 Power contactor -AC3 duty of rated capacity .