SPECIAL REPAIR/ REPLACEMENT TO EARTHING INFRASTRUCTURE AT AF STN BKT

Amount

Material & labour for Chemical earthing complete with copper plate electrode of size 900mm x 600mm x5mm burried directly in ground vertically to a depth not less than 4.70 mtr below normal ground level (with top edge of earth plate not less than 3.60 mtrs below ground level ) of earth pit size 1200mm x 600mm x 4700mm connected to copper strip of size 32 mm x 6 mm as main earthing lead by means of brass nut and bolt / brazing at all joints and connected to earth test point and testing on completion with and including necessary excavation and earth work in any type of soil and GI pipe medium grade 40 mm bore for protection of copper strip from earth electrode to earth test point with adequate quality of charcoal dust, common salt,magnesium sulphate,copper sulphate and bentonite powder solution in alternate layers of 150 mm thick layers all around the earthing plate and PCC chamber/pit of size 300x300x300 mm on 900mm x 600mm x 100mm PCC (1:4:8) base in type C-2 using 40 mm graded crushed stone with RCC (1:2:4) type B1 (using 20 mm graded crushed stone aggregate )cover of size 400mm x400mm x50 mm reinforced with 8 mm dia TMT bars @ 75mm C/C both ways with mild steel flushed type handle 12 mm dia, PGI funnel with wire mesh, 20 mm dia GI pipe medium grade for watering complete all as specified and directed as shown in drawing. Note- (a)Cost of copper strip and GI protection pipe up to distance 7.5 mtr shall deemed to be included in the quotated unit rate of above items. (b) On testing after completion of job , If desired earth resistance(less than 2 ohm) is not found the earthing shall be redone at no extra cost to govt.

M&L for earthing complete with copper earth plate electrode of size 600mm x 600mm x 3.15mm thick burried directly in ground vertically at a depth not less than 3.25 meter deep below normal ground level with top edge of the plate not less than 2.50 metre below normal ground level surrounded from all sides by 15 cm thick packed layer of charcoal dust and common salt, filling in alternate layer and electrode connections by using copper strip of size 20mm x 3 mm as main earthing lead by means of brass nut and bolt / brazing at all joints and protected by light grade 32 mm dia GI pipe connected, and GI pipe medium grade 20 mm bore for watering and including funnel, wire mesh, and PCC chamber/pit of size 300mm x 300mm x 300mm on 600mm x 600mm x 100mm PCC (1:4:8) base in using 40 mm graded crushed stone, RCC pit cover with PCC (1: 2:4) type C2 cover of size 400mm x400mm x50 mm reinforced with 8 mm dia TMT bars @ 75mm C/C both ways with mild steel flushed type handle 12 mm dia including excavation and earth work, disposal of surplus soil to a distance not exceeding 50 mtr all as specified and as shown on Plate No 3 of SSR Part I, complete all as specified and directed Note- (a)Cost of copper strip and GI protection pipe up to distance 7.5 mtr shall deemed to be included in quotated unit rate (b) On testing after completion of job , If desird earth resistance(less than 3 ohm) is not found the earthing shall be redone at no extra cost to govt.

M&L for earthing complete with galvanized steel earth plate electrode of size 600mm x 600mm x 6mm thick burried directly in ground vertically at a depth not less than 3.25 metre deep below normal ground level with top edge of the plate not less than 2.5 metre below normal ground level surrounded from all sides by 15 cm thick packed layer of charcoal dust and common salt, filling in alternate layer and electrode connections by using galvanized iron earth lead wire GI strip size of 32mm x 6mm as main earthing lead by means of brazing at all joints and protected by light grade 40 mm dia GI pipe connected to test point and GI pipe medium grade 20 mm bore for watering and including funnel, wire mesh, and PCC chamber/pit of size 300mm x 300mm x 300mm on 600mm x 600mm x 100mm PCC (1:4:8) base in using 40 mm graded crushed stone, RCC pit cover with PCC (1: 2:4) type C2 cover of size 400mm x400mm x50 mm reinforced with 8 mm dia TMT bars @ 75mm C/C both ways with mild steel flushed type handle 12 mm dia including excavation and earth work, disposal of surplus soil to a distance not exc. 50 mtr all as shown on Plate No 3 of SSR Part I , complete all as specified and directed. Note- (a)Cost of GI strip and GI protection pipe up to distance 7.5 mtr shall deemed to be included in the quotated unit rate. (b) On testing after completion of job , If desired earth resistance(less than 5 ohm) is not found the earthing shall be redone at no extra cost to govt.

Earthing complete with galvanised steel earth plate electrode 600mm x 600mm x 6mm thick burried directly in ground (earth pit not less than 3.25 metres deep below normal ground level) with top edge of plate not less than 2.5 metre below normal ground level connected to galvanised earth lead wire of 4 mm dia by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No 5 of MES Schedule Part-I connected to earthing point and testing on completion with and including 15 mm bore light grade G.I. protection pipe (upto 7.5 M beyond outer edge of earth pit) chamber/ pit of PCC (1:3:6) type C1 with RCC (1:2:4) type B-1 40 mm thick cover reinforced with 6 mm dia M.S bars 3 Nos both ways with lifting hook made out of 6 mm dia bar, watering arrangement with funnel and wire mesh and 20 mm medium grade G.I. watering pipe, common salt and charcoal filling, including necessary excavation and earth work, complete all as specified and directed. Note- (a)Cost of earthing lead and GI protection pipe up to distance 7.5 mtr shall be included in the quotated unit rate. (b) On testing after completion of job , If desired earth resistance(less than 5 ohm) is not found the earthing shall be redone at no extra cost to govt.

M&L for chemical earthing by drillinmg holes of 200 mm dia and 4.70 mtr in depth in any kind of soil and providng 3.0 mtr long pure copper strip of size 32mm x 6mm duly encapsulated in copper pipe of 88 mm outer dia and filling the hole with advance non toxic earth enhancing back fill compond quantity not less than 30 kg and water till complete soaking of chemical water mixture and providing a RCC pit chamber (1:3:6) type C1 with RCC (1:2:4) type B1 40mm thick cover reinforced with 6mm dia MS bar 3 Nos both ways with lifting hook and upto 7.5 mtr long copper strip of sizxe 32 mm x6 mm as earth lead conductor duly protector with 65 mm bore medium grade GI pipe from terminal point to earth test point and duly connected with terminal point through breezing and to connect with earth test point with brass bolt nuts and washer of suitable size and fixed on wall by mounting the strip of FRP /DMC bridge insulator and providng a test point a terminal block made of gun metal of phosphorus bronze of size 75 mmx75mmx25mm duly drilled and screwed and fixed on wall on insulators including 3 nos 8 mm dia 25 mm long hexagonal haed brass scew complete with removing of excavated soil to a distance not excedding 50 meter and height not exceeding 1.5 m from the starting point and testing on completion all as specified and directed. Note- 1. On testting afer completion of job, if desired earth resisirance less than 3 ohm is not found then earthing shalll be redone at no extra cost to govt.

M&L for boring underground of 100 mm dia upto 30 mtr depth below ground level in any kind of soil strata for insertion of pipe electrode of 30 mtr length and coper strips etc. for bore earthing complete all as specified and directed.

M& L for lowering bore Galvanised iron tubing, 50mm bore, light grade with all fittings/ accessories for protection of earth strips complete all as specified and as directed.

M&L for copper strip of size 20mm x 3mm complete with saddles and fixing screws for fitting the strip for earth continuty conductor up to test points complete all as specified and as directed.

M&Lfor Earth continuity conductor or main earthing lead of size 25mm x 4mm, fixed to wall on batten or recess or chases or burried in ground or drawing into conduit or any other situation for loop earthing etc copper strips including brazing complete all as specified and directed.

M&L for Galvanised iron strip of size 32mm x 6mm with saddles and fixing screws on porcelain insulators for roof conductors and down conductors above ground level complete all as specified and directed.

M&L for Aluminium strip of size 25 X 3 mm with saddles and fixing screws Etc. for roof conductor and down conductor above ground level complete all as specified and as directed..

Supply installation and testing of isolation transformer 2 KVA 240 Volts AC, 50 Hz 1:1 ratio of input and output voltage copper wound air cooled with MS sheet metal enclosure duly painted with 3 core copper conductor PVC insulated cable with plug top to maintain E_N voltage less than 2 volts complete all as specified and as directed.

M& L for Earthing pit of PCC (1:3:6) type C1 using 20 mm bore graded stone aggregrate on of size 800mm x 800mm x 100mm using 40 mm graded stone agregrate base of PCC (1:4:8) type D-2 with precast RCC cover 40 mm thick in PCC (1:2:4) type B1 using 20 mm graded stone aggregrate with 8 mm dia TMT bars 3 nos both ways with 12 mm dia round handle complete all as specified and directed.

S & F in replacement of earthing pit size of 300mm x 300mm x 3mm indicator made of CRCA sheet of size 300mm x 300mm x 3mm including 600mm height GI pipe of 15mm dia light grade for display of EP No & ER Value in ohm. The MS angle iron of size 300mm x 300mm x 6 mm will having planting depth of 300 mm below ground level and 300 mm above ground level and should be embeded in PCC (1:3:6) type C1 using 20mm graded stone aggregate including earth work. The MS angle iron with display shall be painted with synthetic enamelled paint over one coat of red oxide primer with writing of EP No ER Value complete all as directed and directed.

M&L for laying of single run of single core PVC insulated unsheathed multi stranded copper conductor cable of size 25 Sqmm 1100 volts grade as earth continuity conductor drawn through into and including rigid non metallic PVC conduit of suitable size on roof/wall/ceiling including making good the disturbed surfaces of wall etc including taking out old unserviceable burnt/damaged wire from its existing position complete all as specified and directed. (Note : Rate of Non metallic PVC conduit shall deemed to be included in the quoted unit rate).

S & F test point terminal block made of gun metal or phosphorus bronze size 75x75x25 mm drilled and screwed including 3 nos 8 mm dia 25 mm long hexagonal head screws complete all as specified and directed.

Taking out / dismantling of existing strip and earthing pit chamber including protection pipe and refilling earthing and ramming after removal complete all as specified and directed.

Taking down of existing earth strip any size mm of copper/GI strip/Alluminium strip/copper cable complete all as specified and directed.

Industrial Traders

H C CONSTRUCTION

M/S Husna Electrical Works

Shree Kanth Technologies