Document - irpmu.railnet.gov.in

made using exothermic welding.
8. Inspection Chamber :
a. A 300*300*300mm (inside dimension) concrete box with smooth cement plaster
finished shall be provided on the top of pit. A concrete lid, painted black approx.
50mm. Thick with pulling hooks shall be provided to cover the earth pit.
b. Care shall be taken regarding level of the floor surrounding the earth so that the
connector is not too deep in the masonry or projecting out of it. The masonry work
shall be white washed inside and outside.
c. On backside of the cover the date of test and average resistance value shall also be
written with yellow paint on black background.
9. Earth Bus bar and Connection to pit:
a. The Earth electrode and the copper earth bus bar i.e. main equipment buss bar will
connected by 35 sq.mm. multi strand single core PVC insulated copper cable,
exothermically welded to electrode at one end and the earth bus bar at other end.
b. The copper earth bus bar will be 300*25*6 mm size with tin coating and holes for
fixing it to the wall of equipment room with insulation studs.
c. All connection to the earth bus bar will be through tinned copper lug of Dowell or
similar make if suitable size.
d. All nuts and bolts will be stainless steel type.
10. DRAWINGS:-
A) RDSO Drg. No. SDO/RDSO/E&B/001 Dt. 19.09.08.
Signature of contractor Page 10 of 104 Dy CSTE/Proj/IRPMU/CNB