REPAIR RECHARGING IMPROVEMENT TO CRITICAL EARTHING INFRASTRUCTURE TO TECHNICAL AND WSA BLDG AT AF STATION BAREILLY

Amount

M&L for replacement of old defective earthing by providing new earthing comprising of glavanised steel earth plate electrode of size (600 x 600)mm x 6mm thick burried directly in ground, earth pit not less than 2.25 metres deep below normal ground level with top edge of the plate not less than 1.50 metres below normal ground level connected to galvanised iron strip (32 x 6)mm as earthing lead by means of bolts, nuts, check nuts and washers of galvanised iron or steel connected to earthing test point including 40mm dia GI tubing medium grade and necessary fittings for protection of GI strip including laying of charcoal dust and commen salt in alternate layer, PCC pit (1:3:6) type C-1, using 20 mm graded stone aggregate, RCC cover 40 mm thick in RCC (1:2:4) type B-0, using 12.5 mm graded stone aggregate reinforced with 6 mm dia mild steel deformed bars @ 75 mm centre to centre both ways with MS handle 8mm dia, plastering 15mm thick CM (1:6) externally upto 150mm below ground level, GI funnel with 20mm dia medium grade GI pipe for watering and wire mesh including excavation, earth work and disposal of surplus soil complete all as shown in Electrical plate No. 3 of SSR Part- I (2009) and connected to earth test point including testing and making building number and writing test results on a 3mm thick painted MS earth pit making plate of size (200 x 100)mm duly welded with a 450mm long 10mm dia round MS rod fixed with the earth pit chamber by grouting complete all as specified and directed.

Description all as per ser Item No. 1.00 here-in-before but using 4.00 mm dia GI earthing wire and 15 mm bore GI light grade protection pipe complete all as specified and as directed.

M&L for replacement of old defective earthing by providing new earthing comprising of copper earth plate electrode 600mm x 600mm x 3.15mm thick buried directly in ground preferably in vertical position, (earth pit not less than 2.25 m below ground level) with top edge of earth plate not less than 1.50 m below normal ground level, connected to copper earth strip of size (20 x 3)mm by means of nuts, bolts, check nuts & washers of copper all as shown on electrical plate No. 3 of MES schedule 2009, Part–I (Specifications) and connected to main switch board/ main DB’s/ earthing test point including all necessary excavation and earth work in any type of soil, adequate quantity of charcoal dust & common salt all around the earth plate in alternate layers of 150mm in all directions with & including watering pipe 20mm dia GI medium grade, GI funnel made out of 0.63 mm thick GI sheet, wire gauge, 50 mm thick precast RCC cover of size 450 mm X 450mm with (1:2:4), type B-1 duly reinforced with 8mm dia TMT steel bars @ 150mm c/c both ways with suitable lifting handle made of 10mm dia mild steel round bars to lift the cover, earth pit of PCC (1:3:6) type C-1, GI protection pipe light grade 40 mm bore including testing on completion of job complete all as specified and as directed.

M&L for replacement of old defective earthing by providing new chemical earthing comprising of copper plate electrode 900mm x 600mm x 5mm thick burried directly in ground vetically 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 ) connected to copper strip 32 mm x 6 mm as main earthing lead by means of brass brazing at all joints all as directed and connected to earth test point all as specified and testing on completion with and including necessary excavation and earth work in any type of soil, GI pipe medium grade 50 mm bore for protection of copper strip from earth electrode to earth test point of galvanised Iron / steel, adequate quality of charcoal dust, common salt and magnesium sulphate in alternate layers of 100 mm thick x 6 layers all around the plate and RCC (1:2:4) type B1 using 20 mm graded crushed stone aggregate ) cover of size 54mm x 54mm x50 mm thick 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 light grade for watering complete all as shown in drawing. Note :- (a) Cost of copper strip and GI protection pipe up to a distance 7.5 m shall be included in quated rate of above Items. (b) On testing, after completion of job, if desired earth resistence (less than 1 Ohm ) is not found, the earthing shall be redone at no extra cost to govt.

Repairing to existing defective earthing by taking out carefully earth plate, watering pipe, protection pipe and re-buried the same after removing sludge from the plate and pipes. The earth plate shall be buried directly in ground with top edge of earth plate not less than 0.50 Mtr below normal ground level, connected to GI earth wire or GI/ Copper earth strip any size by means of nuts, bolts, check nuts and washers of galvanised iron or steel all as shown on electrical plate No 3 of MES schedule 2009, Part-I (Specifications) and other end connected to main switch board/ main DB's / earthing test point including all necessary excavation and earth work in any type of soil, adequate quantity of charcoal dust & common salt in alternate layers all around the earth plate minimum 150mm in all directions with & including GI funnel made out of 0.63mm thick GI sheet, wire gauge, 50mm thick RCC cover in cement concrete (1:2:4), type B-1, duly reinforced with 8mm dia mild steel TMT bars @ 100mm both ways center to center with suitable lifting handle made of 10mm dia mild steel bars to lift the cover, earth pit of PCC (1:3:6) type C-1, as required at site to complete the earthing including testing of earthing on completion of job complete all as specified and as directed. Notes for Ser No 1.00 to 5.00 :- (a) Cost of copper strip and GI protection pipe up to a distance 7.5m shall be deemed to be included in quoted rate of above Items. (b) On testing,after completion of job, if desired earth resistence (less than 1 Ohm ) is not found, the earthing shall be redone at no extra cost to govt.

S&F Test point terminal block made of gun metal or phosphorus bronze size (75 x 75 x 25)mm, drilled and screwed including 3 nos., 8 mm dia 25 mm long hex head screw fixed to wall and connected with earth strip complete all as specified and as directed.

M&L for construction of cement concrete earth pit chamber in PCC (1:3:6), type C-1, (450 x 450)mm x 50mm thick Pre-cast RCC cover in cement concrete (1:2:4), type B-1, duly reinforced with 8mm dia mild steel TMT bars @ 100mm both ways center to center with suitable lifting of handle made of 10mm dia mild steel round bar to lift the cover with and including necessary excavation, earth work in any type of soil and dismantling of old broken earth pit chamber and disposal of soil to a distance not exceeding 50m complete all as specified and as directed. Note :- This item is an independent item and the same is not connected with any other items of this BOQ.

S&F Copper strip (20 x 3)mm buried in ground as main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthling etc. as required (20 x 3)mm copper countinity earth conductor complete all as specified and as directed. Note :- The joints of each lead strip shall be welded/ brazed and the cost of brazing/ welding shall deemed to be included in unit rate of this item.

All as per Item No 8.00 here-in-before but using GI Strip (32 x 6)mm complete all as specified and as directed.

All as per Item No 8.00 here-in-before but using GI Wire 4mm dia complete all as specified and as directed.

S&F GI pipe, light grade 40mm dia bore for protection of copper strip, with all fittings including fixing arrangements with screws clamps on insulator for protection of Aluminium earth strip upto 1.50 Mtr from ground level including taking out unserviceable one complete all as specified and as directed.

M&L for earthing enhancing back fill compound (Powder) suitable to increase the earth resistant value complete all as specified and as directed. Make :- Ennov, True Power Earthing, Alopp, Gravin.

S&F of single pointed air termination aluminium rod, 12 mm dia and 300 mm long including 20 mm size air terminal base / ridge saddle made of gun metal with and including fixing arrangment on the ridge of RCC roof / on pole as required complete all as specified and directed.

M/s Agarwal Builders