REPAIR / MAINT OF EARTHING (CONVENTIONAL / CHEMICAL), SPDs, LIGHTENING ARRESTER AND CONNECTED WORKS AT AIR FORCE STATION NATHATOP

Amount

M & L for replacement of old defective earthing by providing as 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 galvanised earth strip of size 25 X 4 mm by means of nuts, bolts, check nuts & washers of galvanised iron or steel all as shown on electrical plate No. 3 of MES schedule 2020, 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, , GI protection pipe light grade 40 mm bore including testing on completion of job complete all as specified and directed.

M & L for replacement of old defective earthing by providing new earthing comprising of copper earth plate electrode 600 mm X 600 mm X 3.15 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 copper earth strip of size 20 X 3 mm by means of nut-bolts, check nuts and washers of galvanised iron or steel all as shown on electrical plate No. 3 of MES schedule 2020, 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 and common salt all around the earth plate in alternate layers minimum 150 mm (compacted thickness) in all directions with and including watering pipe 20 mm dia GI medium grade, GI funnel made out of 0.63 mm thick GI sheet, wire gauge, GI protection pipe light grade 40 mm bore including testing on completion of job complete all as specified and directed.

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 3.10 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, 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, complete all as specified and directed.

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 1.50 m below normal ground level, connected to GI earth wire or GI / copper earth strip any size by means of nut-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 150 mm in all directions with & including GI funnel made out of 0.63 mm thick GI sheet, wire gauge, complete the earthing including testing of earthing on completion of job complete all as specified and directed. Note : (i) Necessary eath work will be measured and paid seperately. (ii) Material like, salt charcoal, protection pipe, funnel and earth plate will be measured and paid seperately

M & L for construction of cement concrete earth pit chamber in PCC 1:3:6, type C-1, 450 X 450 X 50 mm thick Pre-cast RCC cover in cement concrete 1:2:4, type B-1, duly reinforced with 8 mm dia mild steel TMT bars with fair finished concrete surfaces including necessary formwork and earth work as required/ordered at site, complete all as specified and as directed.

M&L for 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.

Dismantling the existing earthing pit chamber made of PCC 1:2:4 type B-I (using 20 mm graded crushed stone aggregate) and cleaning the area including removal of broken PCC/excavated material 50 mtr away from site all as specified and as directed by Engr-in-Charge.

S&F in repair test point terminal block made of gun metal or phosphorus bronze size (75x75x25)mm drilled and screwed including 3 nos. 8mm dia 25mm long hex head screws for holding the bronze plate including fastening/ bolting the roof down conductor and earth electrode over the bronze plate with copper bolts & nuts of suitable size, providing 10mm thick fibre sheet of size (15x15)cm below the test point to avoid direct contact with wall including enclosing the test point with 1.6mm thick MS sheet front openable box duly painted complete all as specified and as directed.

M&L for Painting of old existing cement concerete earth pit chamber in colour code as white for convintional, yellow for copper conventional and red for chemical including preparation of surface , removal of dust etc and applying two coat of suitable paint complete all as directed by Engr-in-Charge.

M&L for taking out loose/displaced Serviceable Aluminium Strip/ Copper Strip/ GI Strip of any size and make or any description including all accessories and refixing the same with necessary Fixing Arrangement like screws, saddles, nuts and bolts, complete all as specified and as directed. NOTE : Cost of Screws, Saddles, Nuts and Bolts of copper/brass, etc. will deemed to be included in the Quoted Unit Rate.

Supply only in replacement Copper plate of size 60 cm x 60 cm x 3.15 mm complete all as specified and directed by Engr-in-Charge

Material and Labour for earth continuity conductor or main galvanised iron rarth strip of size 32 x 6 mm burried in ground, fixed to wall, any other indicated situation for loop earthing and the like upto test point on necesarry insulators and fastning screws, rawl plugs complete all as specified and directed.

All as per item No. 12 hereinbefore but aliminium stip of size 25 x3 mm

All as per item No. 12 hereinbefore but copper stip of size 20 x 3mm

All as per item No. 12 hereinbefore but copper stip of size 32 x 6 mm

All as per item No. 12 hereinbefore but GI 4 mm wire

S & F of 25 mm dia of GI tubing, light grade with all fittings including fixing arrangement with screws, reducer and clamps fasnig as protection of wire on wall/ roof with suitable type of clamp and proper fixing of insulator up to 15mtr building height etc complete all as specified and directed.

S & F of 25 mm dia of GI tubing, medium grade with all fittings including fixing arrangement with screws, reducer and clamps fasnig as protection of wire on wall/ roof with suitable type of clamp and proper fixing of insulator up to 15mtr building height etc complete all as specified and directed.

S & F of 40 mm dia of GI tubing, light grade with all fittings including fixing arrangement with screws, reducer and clamps fasnig as protection of wire on wall/ roof with suitable type of clamp and proper fixing of insulator up to 15mtr building height etc complete all as specified and directed.

S & F of 40 mm dia of GI tubing, medium grade with all fittings including fixing arrangement with screws, reducer and clamps fasnig as protection of wire on wall/ roof with suitable type of clamp and proper fixing of insulator up to 15mtr building height etc complete all as specified and directed.

S & F of 50 mm dia of GI tubing, light grade with all fittings including fixing arrangement with screws, reducer and clamps fasnig as protection of wire on wall/ roof with suitable type of clamp and proper fixing of insulator up to 15mtr building height etc complete all as specified and directed.

S & F of 50 mm dia of GI tubing, medium grade with all fittings including fixing arrangement with screws, reducer and clamps fasnig as protection of wire on wall/ roof with suitable type of clamp and proper fixing of insulator up to 15mtr building height etc complete all as specified and directed.

S & F High density polyethylene pipes (HDPE)of dia 32 mm as earthing contunuity protection laid in trenches/wall/floor complete all as specified and directed

Cutting grass, removing of surplus of Soil from old existing serviceable earthing chamber pit and aligning in the centre line of earthing strip including taking old and properly filled of soil around chamber and repair of chamber is required at site with PCC 1:3:6, type C-1 complete all as specified and directed

S & F in replacement single pointed air termination aluminum rod, 12 mm dia and 300 mm long with arrester clamp 12mm made out of brass/gun metal/screw nut, bolt including provision of cement concerete 1:2:4 (20 mm graded stone aggregate) block 300x300x300 mm up to 15 mtr height complete all as specified and drected.

S & F in replacement single pointed air termination aluminum rod, 12 mm dia and 300 mm long with galvanised iron steel tubing 40 mm bore (dia) 1.5 mtr long light grade with all fittings out of brass/gun metal/screw nut, bolt including provision of cement concerete 1:2:4 (20 mm graded stone aggregate) block 300x300x300 mm up to 15 mtr height complete all as specified and drected.

S & F as in replacement single pointed air termination copper rod, 12 mm dia and 300 mm long with arrester clamp 12mm made out of brass/gun metal/screw nut, bolt including provision of cement concerete 1:2:4 (20 mm graded stone aggregate) block 300x300x300 mm up to 15 mtr height complete all as specified and drected.

S & F as in replacement single pointed air termination copper rod, 12 mm dia and 300 mm long with galvanised iron steel tubing 40 mm bore (dia) 1.5 mtr long light grade with all fittings out of brass/gun metal/screw nut, bolt including provision of cement concerete 1:2:4 (20 mm graded stone aggregate) block 300x300x300 mm up to 15 mtr height complete all as specified and drected.

M&L for cross arms, bracings, supports, clamps and back plates fabricated from structural steel sections including nuts, bolts, washers, welding, bending cold or hot, drilling holes for bolts, in any shape or size as indicated or directed and inclusive of one primer coat, one under coat and one finishing coat of paint complete including dismantling existing rusted sections all as directed.

M&L for PCC 1:2:4 type C2 using 40 mm graded stone aggregate as in coping of pole all as directed including use & waste of necessary form work all as specified and as directed.

M&L for Checking of Earth Resistance test of existing Galvanised iron/copper conventional/Chemical Earthing for getting suitable resistant test complete all as specified and directed by Engr-in-Charge. Note :- (a) Contractor will Check Earth Resistance of test points and will be recorded in Register, same will be put up to the Engineer-in-Charge through concern JE E/M. (b) Necessary T&P will be provided by the Contractor. (Tester should be caliberated from NABL accredited labs). (c) Contractor will be responsible for pouring of water in the Earth Pits Weekly at his own arrangement with Water Tanker, etc. (d) Checking of Earth Pits existing and improve it by watering, adding of chemical etc. (Chemical will be measured and paid separately) (e) Contractor will be responsible for marking of Earth Check date and due date on existing Plate with paint as specified by Engineer-in-Charge. (f) Contractor will be responsible for cleaning of bushes, grass, sand etc inside and all around upto 1.50 Metre Area of existing Earth Pit with tightening of Strip. (g) Cost of register for noting earthing results, location wise shall deemed to be included with the unit rate. Proforma of detail column will be printed as per the direction of Engineer-in-charge. (j) The contractor is responsible for mainting the value of chemical earthing as per station norms as directred by Engr-in-Charge. (k) Grid if any nos of earth pits having one test point shall be considered as one point for measurement.

M&L for replacement Maintenance Free UL approved Copper Bonded Earth Rod of 10 Feet length 17.2 mm dia made of High Tensile Low Carbon Steel Rod, molecularly bonded with 99.9% Electrolyte Grade Copper on outer surface (minimum copper bonding thickness-250 microns) jointed with Copper Bus Bar of size 50x6x200mm with Exothermic joint, complete all as specified and as directed.

M&L for supply and pouring of 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 as directed. Note: Measurement of Chemical will be done in Powder form.

Taking down old unserviceable of any type of earthing marker and Supply and fixing of Earthing identifier marker of size 25x25 mm flat iron and 5 mm thick length of flat iron 75 cm long which is 60 cm FI above the Ground level and 15 cm length FI below the Ground level and fixed with PCC 1:2:4 (12.5 mm graded aggregate) in post holes and the TOP of the flat iron arabolic/ semicirculer/ traingular/rectangular shape MS plate 1.6 mm thick of size 30 cm width and 20 cm height to welded/fixing to the flat iron including two coat of synthetic enamel paint over a coat of primer on steel surface cutting for Equipment Earthing/Lighting Earthing/L2 Earthing etc complete all including Earth Plate No/Description of Earthing/Type of Earthing on Plate with white paint including earth plate no and earthing resistance with earthing check date and earthing check due date complete all specified and directed by Engineer in charge.

Taking down unserviceble, hanging, broken, and delocation of air termination copper/Aluminium rod of any make and size from roof of existing buildings height upto 15 metres from buildings and refixing the same after repair including brazing,nuts, bolt and insulators complete all as specified and directed.

M&L 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 one. all as specified and as directed by Engr-in-Charge

M&L for in repair CI funnel made as specified in SSR Part -I electrical plate No 3 fixed with GI pipe of watering by welding or threading etc including taking down old unserviceable complete all as specified and as diirected.

M&L for down conductor using 16 sqmm single core copper cable both ends thimbled properly with copper Lugs including taking down complete all as specified and directed.

M&L for down conductor using 25 sqmm single core copper cable both ends thimbled properly with copper Lugs including taking down complete all as specified and directed.

M & L for brazing work with copper brazing alloy rod with help of oxygen and LPG cylinder using required copper strip of size 20 mm x 3mm upto 30 cm length along with cleaning work of strip with descaling solution/emery paper which are laid as roof/down conductor on any height of building up to 15 mtr building height complete all as specified and directed by Engr-in-Charge.

M & L for brazing work with copper brazing alloy rod with help of oxygen and LPG cylinder using required copper strip of size 25 mm x 3mm upto 30 cm length along with cleaning work of strip with descaling solution/emery paper which are laid as roof/down conductor on any height of building up to 15 mtr building height complete all as specified and directed by Engr-in-Charge.

M & L for brazing work with copper brazing alloy rod with help of oxygen and LPG cylinder using required copper strip of size 32 mm x 6 mm upto 30 cm length along with cleaning work of strip with descaling solution/emery paper which are laid as roof/down conductor on any height of building up to 15 mtr building height complete all as specified and directed by Engr-in-Charge.

M & L for brazing work with GI brazing alloy rod with help of oxygen and LPG cylinder using required galvanised strip of size 20 mm x 3 mm upto 30 cm length along with cleaning work of strip with descaling solution/emery paper which are laid as roof/down conductor on any height of building up to 15 mtr building height complete all as specified and directed by Engr-in-Charge.

Excavation in trenches in any type of soil not exceeding 1.5 mtr deep and not exceeding 1.5 mtr wide for laying of cables, RCC poles/stays and struts etc or /getting out cable cover and stacking for reuse/ credit , trimming sides and forming bottom surface all as specified and directed at site.

Returning, filling in including spreading, levelling, watering and well ramming in layers not exc 25 cm in soft/loose soil complete all as specified and directed.

Removing surplus excavated soil nexc 50 mtr and depositing where directed at a level n-exc 1.5 mtr above the starting point complete all as specified and directed.

Supply salt commercial for the earth pit all as specified and directed

Supply charcoal dust for the earth pit all as specified and directed.

Excavation in trenches (manually) n exc 1.5 mtr wide & exc 1.5 mtr as part there off in depth complete all as specified and directed by Engr-in-Charge

DAVINDER SINGH (BID ID -3254453)

RANBIR ENTERPRISES (BID ID -3249083)

AJAY KUMAR (BID ID -3254935)

MOHAN LAL AND SONS (BID ID -3254579)

ASIA BUILDER (BID ID -3248997)