SPECIAL REPAIR TO LIGHTENING ARRESTERS AND EARTHING PITS INCLUDING BRAZING AT AF STN BAMRAULI UNDER GE AF BAMRAULI

Earthing complete with galvanised steel earth plate electrode 60 cm x 60 cm x 6.3 mm thick burried directly in ground (earth pit not less than 2.25 Meter deep below normal ground level) with top edge of plate not less than 1.5 meter below normal ground level, connecting to the galvanised iron strip of size 32 x 6 mm as earth lead, by means of bolts, nuts, check nuts and washers of galvanised iron 32 x 6 mm earth lead protected by provision of GI medium grade pipe 40mm bore including provision of concrete pit in PCC (1:2:4) type B-1 using 20mm graded stone aggregates with 40mm thick cover of RCC (1:2:4) reinforced with XPM (weight not less than 4 Kg/Sqm) and frame of angle iron 25 x 25 x 6mm with lugs 02 Nos and with 6mm dia MS bar handle made to shape, GI medium grade 20mm bore pipe for watering perforated at bottom 1.75 meter long placed on top edge of earth plate, common salt and charcoal filling, test point made out of 75 x 50 x 6mm phosphorous bronze with fixing arrangement, funnel, wire mesh and earth work in hard/dense soil, returning filling in and removal of surplus soil to a distance not exceeding 50 metres all as per electrical plate No 3 and connecting to earth test point including testing on completion, complete all as specified and directed by the Engineer-in-Charge.

All as per item No. 1 here-in-before but using copper plate 60 × 60cm ×3 mm thick electrode and 20 × 3mm copper strip as earthing lead, complete all as specified and directed.

S&F in replacement of Chemical earthing with copper earth plate 90x60cmx5mm & copper earth strip 32x6mm, complete all as specified and directed.

Material and labour for fixing of strip any size and brazing existing strip with new strip and making working condition including checking of earth continuity, complete all as specified and directed by Engr -in-charge. Note:- The Earth tester or any other tools required for testing deemed to the existing rate.

S&F in replacement Aluminium strip 25 x 3 mm with saddles and fixing screws etc. for roof conductors and down conductors above ground, complete all as specified and directed.

S&F in replacement Copper strip 32 x 6 mm with saddles and fixing screws etc. for roof conductors and down conductors above ground, complete all as specified and directed.

S&F in replacement Galvanised iron strip 32 x 6 mm buried in ground, complete all as specified and directed.

S&F in replacement Air termination, single pointed aluminium rod 12mm dia and 300mm long, complete all as specified and directed.

S&F in replacement Air termination, single pointed, copper rod 12mm dia and 300mm long, complete all as specified and directed.

S&F in replacement Test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 nos. 8mm dia 25mm long hex. head screw with PVC junction box of size 210 x 210 x75 mm, complete all as specified and directed. Make sintex /Hensel or equivalent as approved. Note :- Minor items required at site will be deemed in the quoted rate.