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| 1 | M&L in repair Earthing with galvanised steel earth plate electrode of size 60cmX60cmX6cm thick buried directly in ground (earth pit not less than 2.25m deep below the ground level) with top edge of the plate not less than 1.5m bellow normal ground level, connected to the galvanised earth lead by means of bolts, nuts and washers of galvanised iron or steel using GI or steel wire 4.00 mm diaas earthing lead as shown in electrical plate No 3 of SSR Part-I connected to earthing test point all as specified or indicated including testing on complete including necessary form work excavation and earth work in soft/loose soil, returning filling, disposal of surplus soil, earth pit in PCC 1:2:4 type B-1 using 20mm grade stone aggregate pit, funnel, 20mm dia GI medium grade watering pipe, 15mm dia GI light grade earth lead protection pipe and pre-cast earth pit cover made of 50mm thick RCC (1:1.5:3) type A1 duly reinforced with 8mm dia TMT bar @ 150 c/c both ways, one lifting handle made of 10mm dia TMT bar embedded in cover slab and cover, wire, copper lugs etc including mesh charcoal and common salt inalternate layer of 15cm thick, complete all as specified and as directed. |
| 2 | M&L in repair earthing complete with GI earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly and preferably vertically in ground, earth pit not less than 2.25 Mtr deep below ground level with top edge of the plate not less than 1.50Mtr below ground level.The earth plate to be connetced with GI earthing strip of size 32mmx6mm thick by means of brazing between GI strip and earth plate min 45 cm in vertical length and GI strip also to be joined by brazing only. The GI earthing stripto be protected by galvanised iron pipe 40 mm bore (medium grade) up to ground level.Earthing shall be include with providing funnel with 20mm bore galvanised iron pipe (light grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) up to 90 cm all around earth plate, further filled with60 cm thick Tibba sandand 2nd layer with 30 cm of Magnesium sulphate powder (compact thickness ) , 3rd layerwithtibba sand up to the ground level. Earthing shall also be include for providing concrete earth pit in PCC (1:2:4) type B-1 (with 20mm graded stone aggregate), 50mm thick precast RCC (1:1.5:3) type A-1 cover slab (reinforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) including necessary form work, earth work and testing, complete all as specified and directed.Note :- (i) GI Strip upto 7.5 metre is included in this rate, the length beyond 7.5 metre shall be measured and paid seperately under respective items.(ii)On testing after completetion, if the desired earth resistance is not obtained, the earthing will be re-done at no extra cost. |
| 3 | M&L in repair earthing complete with copper earth plate electrode 600 mm x 600 mm x 3.15 mm thick, burried directly in ground in vertical position, earth pit not less than 3.65 m deep below ground level with top edge of the plate not less than 2.90m below ground level. The earth plate to be connetced with copper earthing strip of size 20 mmx 3mm thick by means of brazing between copper strip and earth plate min 45 cm in vertical length and copper strip also to be joined by brazing only. The copper earthing stripto be protected by galvanised iron pipe 40 mm bore (medium grade) up to ground level and there after with 40mm dia PVC pipe up to test point. Earthing shall include provision of funnel with 20mm bore galvanised iron pipe (light grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) up to 90 cm all around earth plate further filled with 60 cm thick Tibba sand and 2nd layer with 30 cm of Magnesium sulphate powder (compact thickness), 3rd layer with tibba sand up to ground level. Earthing shall also include concrete earth pit in PCC (1:2:4) type B-1 (with 20mm graded stone aggregate), 50mm thick precast RCC (1:1.5:3) type A-1 cover slab (reinforced with 8mm dia TMT bar @ 15 cm C/C both ways and suitable handle made of 10mm dia) including necessary form work, earth work in excavation, returning filling and removal of surplus earth upto a distance not exceeding 50 m etc all as shown on electrical plate No. 3 ofMES Schedule Part-I complete to obtain less than 2 Ohm earth resistance value, complete all as specified and directed. |
| 4 | Note : (i) Copper Strip upto 7.5 metre is included in this rate, the length beyond 7.5 metre shall be measured and paid seperately under respective items.(ii) Electrical Plate No. 3 refrred in the item above is mainly for earth chamber. |
| 5 | M&L in repair chemical earthing complete with copper earth plate electrode 900 mm x 600 mm x 5 mm thick, burried directly in ground in vertical position, earth pit not less than 3.65 m deep below ground level with top edge of the plate not less than 2.90 m below ground level. The earth plate to be connetced with copper earthing strip of size 32 mm x 6mm thick by means of brazing between copper strip and earth plate min 45 cm in vertical length and copper strip also to be joined by brazing only. The copper earthing stripto be protected by galvanised iron pipe 40 mm bore (medium grade) up to ground level and there after with 40mm dia HDPE pipe up to test point. Earthing shallincludeprovision of funnel with 20mm bore galvanised iron pipe (light grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) up to 90 cm all around earth platefurther filled with60 cm thick Tibba sandand 2nd layer with30 cm of Magnesium sulphate powder (compact thickness ), 3rd layerwithtibba sand up to ground level. Earthing shall also include concrete earth pit in PCC (1:2:4) type B-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:1.5:3) type A-1 cover slab (reinforced with 8mm dia TMT bar @ 15 cm C/C both ways and suitable handle made of 10mm dia) including necessary earth work in excavation, returning filling and removal of surplus earth upto a distance not exceeding 50 Mtr etc all as shown on electrical plate No. 3 ofMES Schedule Part-I complete to obtain less than 2 Ohm earth resistance value |
| 6 | Note : (i) Copper Strip upto 7.5 metre is included in this rate, the length beyond 7.5 metre shall be measured and paid seperately under respective items.(ii) Electrical Plate No. 3 refrred in the item above is mainly for earth chamber. |
| 7 | Material & labour in replacement earth continuity conductor or main earthing lead or lighting conductor 32mm x 6mm GI strip, fixed to wall on batten with saddles and fixing screws or PVC/Porcelain insulators etc or recessed or chases or burried in ground or drawn in conduit / pipe or fixed to poles or any other indicated situation for loop earthing or roof conductors & down conductors etc as required including welding on both sides (over lapping) at all joints except test point fixed, complete all as specified and directed. |
| 8 | Material & labour in replacement earth continuity conductor or main earthing lead or lighthing conductor 20mmx3mm copper strip, fixed to wall on batten with saddles and fixing screws or PVC / Porcelain insulators etc or recessed or chases or burried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing or roof conductors & down conductors etc as required including welding on both sides (over lapping) at all joints except test point fixed, complete all as specified and directed. |
| 9 | Material & labour in replacement earth continuity conductor or main earthing lead or lighting conductor 32mmx6mm copper strip, fixed to wall on batten with saddles and fixing screws or PVC/Porcelain insulators etc or recessed or chases or burried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing or roof conductors & down conductors etc as required including welding on both sides (over lapping) at all joints except test point fixed, complete all as specified and directed. |
| 10 | M&L in replacement Test point terminal block made of gun metal or phosphourus bronze 75x75x25mm drilled and screwed including 3 nos 8mm dia 25mm long hex head screw, complete all as specified and directed. |
| 11 | Supply only common salt commerical, complete all as specified and directed. |
| 12 | Supply only charcoat dust/breeze, complete all as specified and directed. |
| 13 | Supply, installation, testing and commissioning in repair tripod chemical earthing system consisting of 3 Nos of copper earth electrode of 50mm outer dia and 3 m long ) with exothermically welded joint of copper terminal size 40X6 mm for long lasting and connecting each copper rod and the exothermically welded joint bus bar, both CPRI tested on at least 25KA fault current ensuring high current capacity of the system and earth electrode should be certified by the Laboratories confirming to comply with UL 467- International standards grounding and bonding equipment and 1 mtr to make a shape of triangle with 25x3mm copper strip and making bore hole 80 mm dia up to 3 m depth and after fixing of electrode in bore fillup with special mix back fill compound and top of the bore finished with 40mm thick PCC in 1:2:4 type B-1, 75mm thick PCC 1:4:8, type D-2 and backfill / JAM compound shall be covered with advance polymer pit cover of 30x30cm size, complete all as specified and directed.Note : 1.Cost of the items includes the scope of earth work, charcoal, salt, PCC, RCC, checmical compound and Pit cover of required size.2.Testing of earth value shall be arranged by the contractor without any extra cost.3.Value obtained of earh shall be below 1.00 ohm.4.On testing after completetion, if the desired earth resistance is not obtained, the earthing will be re-done at no extra cost. |
| 14 | Supply, installation, testing and commissioning in repair tripod chemical earthing system consisting of 3 Nos of copper earth electrode of 48 mm outer dia, thickness 1mm and 3 m long with exothermically welded joint of copper terminal size 40X6 mm for long lasting and connecting the exothermically welded joint bus bar, both CPRI tested on at least 25KA fault current ensuring high current capacity of the system and earth electrode should be ISI marked and 1 m to make a shape of triangle with 25x3mm copper strip and making bore hole 80 mm dia up to 3 m depth and after fixing of electrode in bore fillup with special mix back fill compound(Earth enhancment compound lab tested) atleast 30 Kg in each electrode shall be covered with advance polymer pit cover of 30 x30 cm size with 8000 Kg load bearing capacity, complete all as specified and directed.Note : 1. Cost of this item includes the scope of earth work, chemical compound and Pit cover of required size.2. Testing of earth value shall be arranged by the contractor without any extra cost.3.Value obtained of earh must be below 1.00 ohm and tested before Engr-in-charge.4. The unit rates are included for 3 Nos bore hole 80mm dia 3m depth, 03 Nos earth electrode 48mm outer dia,1mm thick and 3m long, earth enhancement compound 30 kg for each bore hole, polymer pit cover as a each set.5.On testing after completetion, if the desired earth resistance is not obtained, the earthing will be re-done at no extra cost. |
| 15 | Supply and pouring of RoHS tested Earth Enhancement Compound after mixing with water tested by NABL accredited lab in compliance to IEC 62561-7 with a resistivity < 0.12 ohm-m. It shall be free from bentonite and other hazardous substances. It shall be a permanent, non-corrosive material and will not leach any chemicals into the ground. It shall retain moisture even in high soil resistivity areas, complete all as specified and directed.Note: Chemical powder will be measured in Kgs. |
| 16 | Supply and fixing in repair earth Pit 125 mm dia with FRP Earth Pit Cover of top size 200x200mm, bottom size 300x300mm with height of 150mm with lockable Lid, Earth Pit cover shall be made of Poly plastic tested at 7.5 ton load for closing of earth pits, complete all as specified and as directed. |
| 17 | M&L in replacement of Pre-cast RCC Cover with Handle 2 Nos and hole of dia 40mm in Cement Concrete 1:2:4 (20mm graded stone aggregate) of size 540x540x60mm, reinforced with and including 10mm dia TMT Bars @ 250mm Centre to Centre in both ways, complete all as specified and as directed. |
| 18 | M & L for cement concrete 1:2:4 (20 mm graded stone aggretage) provided around PCC Earthing Pit Chamber of platrform 450 x 450 x 100 mm with fair finished concrete surfaces including necessary formwork and earth work as required/ordered at site, complete all as specified and as directed. |
| 19 | Dismantling the existing earthing pit chamber made of PCC 1:2:4 type B-1 (using 20 mm graded crushed stone aggregate) of size 450 x 450 x 100 mm and cleaning the area including removal of broken PCC/excavated material, complete all as specified and directed. |
| 20 | Material & labour for brazing/soldering on both sides (over lapping) to the GI strip of any size as earthing lead including dismantling the old from the existing position/ equipment without disturbing the functional requirements of the equipments and reconnecting after repair/brazing, complete all as specified and directed. |
| 21 | Material & labour for brazing/soldering on both sides (over lapping) to the copper strip of any size as earthing lead including dismantling the old from the existing position/ equipment without disturbing the functional requirements of the equipments and reconnecting after repair / brazing, complete all as specified and directed. |
| 22 | Supply and laying of BFC 25 kg silicaBackfill compound a mix of silica (22% Alumina, 19.95 % Montmorillonite, 17.2 % Grafite, 18.96 %, Magnesium 21.04 %), complete all as specified and directed. |
| 23 | S&F in replacment of Heavy duty porcelain / poly carbonate insulators of size 32 x 32mm to be fixed on wall/roof/pipe for laying of copper strip as roof/down conductor on building of height between upto 25 metres including nuts & bolts of brass of appropriate size including taking down old unserviceable, complete all as specified and directed. |
| 24 | S&F GI Pipe 40mm bore light grade cut piece of 3.5 metre length fixed vertically with bottom end fixed to paretpet wall / roof of the blgd with suitable clamps & fasteners or PCC work (1:2:4 type B-1) for stragiht vertical erection as directed by Engr-In-Charge and other end (at top) fixed to air termination rod with necessary bolts, nuts etc as required, complete all as specified and directed. |
