PROVN OF LIGHTENING ARRESTERS WITH ALLIED WORKS AT CERTAIN LOCATIONS AT AF STN HIGHGROUNDS

Supply & fix for Air termination, single pointed, copper rod 12mm dia and 300mm long complete all as specified and directed.

Supply & fix Copper strip 20 x 3.15mm with saddles and fixing screws etc. for roof conductors and down conductors above ground complete all a specified and as directed.

Material & Labour for Chemical Earthing with copper pipe electrode 3.0 Metre long having outer pipe dia 80mm & inner pipe dia 50mm duly filled with highly conductive and anti corrosive compound of required quantity having chemical compostion Bentonite 40%, copper sulphate 20%, Gypsom 5%, Graphite 10%, Alum 5%, Zinc sulphate 10%, Aluminium sulphate 10% buried in ground by digging a bore of 150mm dia surrounded by soil friendly backfill compound non soluble in water including connection with Copper earth strip 32x6mm covered with protection pipe 40mm dia GI pipe light grade upto 7.5 metre length, making PCC pit of size 300 mmx 300 mm x 300 mm (inner size) in PCC 1:3:6 type C-1 with 40 mm thick cover in RCC 1:2:4 type B-1 reinforced with 6 mm dia MS bars 3 Nos both ways with lifting hook made of 8mm dia bar and testing on completion to acheive value not more than 1 ohm including necessary excavation and earth work in repair /replacement complete all as specified and directed. Note(s) :-(i) RCC pit cover shall be pre-cast of RCC (1:2:4) type B-1, 80mm thick reinforced with XPM not less than 4Kg/Sqm.(ii) PCC chamber shall be constructed 500 mm away from the edge of earth pit.(iii)Rate shall include Copper strip 32x6mm and protection pipe of length 7.5m, GI pipe beyond 7.5 Metre length required at site shall be measured and paid separately.(iv)Earth resistance should be less than 1 Ohm. In case the test results are not found below 1 Ohm, complete earthing will be redone without any extra cost to Govt. complete all as specified and directed.

Supply and fix for copper strip 32mm x 6mm buried in ground complete all as specified and directed.

Supply & fixing for 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 mcomplete all as specified and directed.

Supply and laying for GI Pipe medium grade 40mm dia for protection of earth lead beyond 7.5 Metre from earth plate, buried underground all as directed and specified.

Supply and fix for GI pipe light grade 40mm dia with all fittings and fixed complete to walls and ceiling complete all as specified and as directed

Supply and fix for epoxy based insulator of suitable size 40mm height for fixing GI/ Al/ copper earth strip on wall / ceiling / floor / poles etc complete all as specified and directed.

Material & Labour for plain cement concrete (1:2:4) type B-1, using 20 mm graded mechanically crushed stone aggregates as in lintels upto 1.5m span, cills, steps, seismic and other similar bands, plinth courses, string courses, ccoping, kneelers, apex stones, bed plates etc slightly rounded or chamferred angles and throating etc with and including use and waste of form work complete all as specified and directed.