SPECIAL REPAIR TO EARTHING PITS AND UP-GRADATION OF EARTHING AND LIGHTENING INFRASTRUCTURE AT AF STATION, BHOWALI.

Amount

M & L for replacement of old defective earthing by providing new chemical earthing comprising copper earth plate electrode 900 x 600 x 5 mm thick burried directly in ground, earth pit not less than 5.10 metres below normal ground level and complete size of pit shall be 1.60 m x 1.60 m x 5.10 metres, with top edge of the plate not less than 3.75 metres below normal ground level, earth plate surrounded from all sides by 20 cm thick salt and charcoal dust and Magnisium sulphate filling in alternate layers of 20 cm thick up to 1.8 metres height and including connected to copper strip 50 x 6 mm (upto 7.5 Metres) by means of brazing / coppers nut-bolts, earth strip protected with 65 mm bore light grade pipe from electrode and upto and including the earth test point of gun metal or bronze of size 75 x 75 x 25 mm test point, 15 mm bore watering pipe light grade GI funnel, wire mesh, earth plate surrounded from all sides by 20 cm thick salt (40 Kg), charcoal dust (40 Kg) and Magnisium sulphate (50 Kg) filling in each alternate layers upto 1.80 m height including excavation, removal surplush soil to a distance not exc. 50 m, PCC pit in PCC (1:3:6) type C-1, using 20 mm graded stone aggregate, RCC cover 40 mm thick in RCC (1:2:4) type B-1, using 20 mm graded stone aggregate reinforced with 8 mm dia mild steel deformed bars @ 75 mm centre to centre both ways complete all as specified and directed. MAKE OF EARTHING- True power Earthing, LPI, Elopp, Ennov, SG Power, G-Max Earthing. NOTE:- Additional Chemical compound if required on account to achieve earth resistance less than 1.00 ohm shall deemed to be included in the unit rate of this item. On testing after completion of job, if desired earth resistance (i.e. less than one ohm) is not obtained, the earthing shall be redone by the contractor without any extra cost to Govt.

Material and Labour for 20 X 3.15 mm size copper strip as earth continuity conductor for roof or down conductor with and including saddles and fixing screws complete all as specified and directed.

Material and Labour for 32 X 6 mm size copper strip as earth continuity conductor burried in groung complete all as specified and directed. NOTE FOR ITEM NO. 2.00 AND 3.00: - The joints of each strip shall be welded / brazed and the cost of welding / brazing shall deem to be included in unit rate of this item.

S & F of single pointed air termination copper rod, 12 mm dia and 1.20 m long having five pointers with and including 20 mm size air terminal base / ridge saddle made of gun metal and necessary fixing arrangment on roof / pole as required complete all as specified and directed.

Supply and fixing of test point terminal block made of gun metal or phasphorous bronze size 75 X 75 X 25 mm drilled and screwed including 3 Nos. 8 mm dia 25 mm long hexagonal head screws complete all as specified and directed.

M & L for rendering 10 mm thick cement plaster on fair faces of brick work or concrete surfaces with cement mortar 1:4 finished even and fair complete all as specified and directed.

M & L for brick work with fly-ash old size bricks having designation 75 conforming to IS-12894 (2002), straight or curved on plan exc. 6.00 m mean radius built in cement mortar 1:4 complete all as specified and directed.

M & L for providing plain cement concrete type B-1, 1:2:4, (using 20 mm graded stone aggregate), as in copings, benching, bed block for embedding hold fasts, kneelers, apex stones, bed plates, water troughs and the like including weathering, slightly rounded or chamfered angles & throating as directed including necessary form work as required complete all as specified and directed.

S & F of 40 mm nominal bore GI tubing, light grade with all fittings including fixing arrangement with screws, clamps for protection of earh strip complete all as specified and directed.

M & L for special electric or gas welding, brazing work to make joint to connect the copper earth strip any size complete all as specified and directed.

S & F of copper or brass nut-bolts and washers for fixing of copper, aluminium or GI earth strips complete all as specified and directed.

M & L for earth pit indicator minimum height 0.50 m above ground level properly grouted in ground as directed and duly painted with 2 coats of synthetic enamel paint and marked the concerned earth pit complete all as specified and directed.

M & L for replacement of old defective earthing by providing new earthing comprising of galvanised steel earth plate electrode 600 mm X 600 mm X 6 mm thick buried directly in ground (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 4.00 mm dia galvanised earth wire 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 minimum 150 mm in all directions with & including watering pipe 20 mm dia GI medium grade, GI funnel made out of 0.63 mm thick GI sheet, wire gauge, 50 mm thick RCC cover in cement concrete 1:2:4, type B-1, duly reinforced with 8 mm dia mild steel TMT bars @ 100 mm both ways center to center with suitable lifting handle made of 10 mm dia mild steel round bar to lift the cover, earth pit of PCC 1:3:6 type C-1, GI protection pipe light grade 15 mm bore including testing on completion of job complete all as specified and directed. NOTE: - ON TESTING AFTER COMPLETION OF JOB, IF DESIRED EARTH RESISTANCE (i.e. LESS THAN ONE OHM) IS NOT OBTAINED, THE EARTHING SHALL BE REDONE BY THE CONTRACTOR WITHOUT ANY EXTRA COST TO GOVT.

Material and Labour for providing maintenance free copper chemical Earthing comprising 50 mm dia, 3.00 m long pure copper earthing electrode with stainless steel connectors suitable for copper earth strip with and including digging suitable hole of minimum 4" dia with Auger upto a depth of 4.00 m deep suitable for insertion of 3.00 m long copper rod earthing electrode, filling the hole with advanced enchancing compound (Chemical) minimum quantity 25 Kg, filling the complete hole with water till complete soaking of the chemical compound, placing of pre-fabricated FRP pit cover on the earthing, ramming of the earth pit cover with soil properly, placing of FRP cover of size 10" X 13" with a height of 10.25" over earthing pit, 99% pure copper earth strip of size 25 X 3 mm for earthing device up to 7.50 metres duly connected with stainless steel connectors by means of the brazing / copper nut-bolts, earth test point of galvanised iron of size 75 X 75 X 25 mm, necessary excavation and earthwork in any type of soil including disposal of surplus soil to a distance not exc. 50 metres complete all as specified and directed. MAKE OF EARTHING- True power Earthing, LPI, Elopp, Ennov, SG Power, G-Max Earthing. NOTE:- Additional earthing compound if required on account to achieve earth resistance less than 1.00 ohm shall deemed to be included in the unit rate of this item. On testing after completion of job, if desired earth resistance (i.e. less than one ohm) is not obtained, the earthing shall be redone by the contractor without any extra cost to Govt.

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