SEAM/HAO/e-NIT/Elec/Foundry Park/004 Dated 15/12/2022

LAYING OF EARTH MAT - Shifting of materials from site store (if required), excavation of earth, laying of M.S. Round rods as per I.S. at 17 meter spacing interval in both ways at 600 mm below ground level as per drawing, welding of M.S. Round rods, application of two coats of red lead primer & finally one coat of bush green synthetic enamel or anti-corrosive bituminous / black enamel paint over welded portion, back filling of earths as per specifications & instruction of the Engineer in-charge including supply of all Labours, welding machine, paints, T&P, etc. As per above specification using M.S. ROUND ROD (DIA. 32 mm) as per relevent I.S. With cost of steel (Main Earthing Grid = 51x9 + 153x4 = 1071 Meter).

LAYING OF EARTH MAT - Shifting of materials from site store (if required), excavation of earth, laying of M.S. Round rods as per I.S. at 17 meter spacing interval in both ways at 600 mm below ground level as per drawing, welding of M.S. Round rods, application of two coats of red lead primer & finally one coat of bush green synthetic enamel or anti-corrosive bituminous / black enamel paint over welded portion, back filling of earths as per specifications & instruction of the Engineer in-charge including supply of all Labours, welding machine, paints, T&P, etc. As per above specification using M.S. ROUND ROD (DIA. 32 mm) as per relevent I.S. With cost of steel (Auxiliary Earth Mat). [Corner Mesh of Main Earthing Grid 04 Nos. + Isolator 26 Nos. = 30 Nos. x 12 Meter = 360 Meter].

PIPE EARHTING - Shifting of materials from site store (if required), excavation of earth for digging of cylindrical hole of 300 mm dia. by auger boring method for driving 40 mm dia.,3000 mm long, heavy guage perforated G.I. pipe of TATA make (M) as earth / ground electrode, connecting test link of electrode consisting of 10 mm thick M.S. plate of size 200 mm x 200 mm (welded with the pipe) by 75x8mm - 160 mm long G.I. flat by bolted joint, treatment of the earth pit by surrounding alternate layers of salt & charcoal of 150mm thick each as per drawing (in case of rath electrode & treated pit), back filling of earth, application of two coats of red lead primer & finally one coat of bush green synthetic enamel or anti-corrosive bituminous / black enamel paint over welded portions, construction of inspection pit of size 500 mm x 500 mm inside & 375mm overall depth ,concreting of the bottom with nominal mix (1:3:6), constrcution of vertical wallss of 250 mm thick 1st class brick work in cement mortar (6:1), construction of removable top cover of 75 mm thcikness in nominal mix (1:2:4) with nominal reinforcement (0.8%) using 8mm tor steel, plastering of of inside & outside surface with 15mm layer (4:1), neat cementing of all plastered surface (in case of rath electrode & treated pit), etc. as per drawings, specifications & instruction of the Engineer in-charge including supply of all Labours, welding machine, paints, bricks, stone chips, sand, cement, T&P, etc. PIPE EARTHING WITH CONSTRUCTION OF INSPECTION PIT (EARTH ELECTRODE). With cost of electrode (40 mm dia., 3000 mm length MEDIUM gauge) and G.I. Flats as above. Feeder (4x4=16) + Tr. (4x2=8) + BT (4x1=4) + ETR (2x1=2) + PT (1x1=1) = 31 Nos. [29 W/O Test Link + 02 Nos. with Test Link].

PIPE EARHTING - Shifting of materials from site store (if required), excavation of earth for digging of cylindrical hole of 300 mm dia. by auger boring method for driving 40 mm dia.,3000 mm long, heavy guage perforated G.I. pipe of TATA make (M) as earth / ground electrode, connecting test link of electrode consisting of 10 mm thick M.S. plate of size 200 mm x 200 mm (welded with the pipe) by 75x8mm - 160 mm long G.I. flat by bolted joint, treatment of the earth pit by surrounding alternate layers of salt & charcoal of 150mm thick each as per drawing (in case of rath electrode & treated pit), back filling of earth, application of two coats of red lead primer & finally one coat of bush green synthetic enamel or anti-corrosive bituminous / black enamel paint over welded portions, construction of inspection pit of size 500 mm x 500 mm inside & 375mm overall depth ,concreting of the bottom with nominal mix (1:3:6), constrcution of vertical wallss of 250 mm thick 1st class brick work in cement mortar (6:1), construction of removable top cover of 75 mm thcikness in nominal mix (1:2:4) with nominal reinforcement (0.8%) using 8mm tor steel, plastering of of inside & outside surface with 15mm layer (4:1), neat cementing of all plastered surface (in case of rath electrode & treated pit), etc. as per drawings, specifications & instruction of the Engineer in-charge including supply of all Labours, welding machine, paints, bricks, stone chips, sand, cement, T&P, etc. PIPE EARTHING WITHOUT CONSTRUCTION OF INSPECTION PIT (GROUND ELECTRODE). With cost of electrode (40 mm dia., 3000 mm length MEDIUM gauge) and G.I. Flats as above. 10 Nos. (Earthing Grid Conductor Periphery) + 05 Nos. (Boundary Fencing) = 15 Nos.

2 Nos. 32 mm ∅ M.S. Rod Riser from Earth Grid. (Below Ground - 150 mm welding joint with Earth Grid). Bays (7x4x2) + HLI / A Frame (10x2) = 76 x 4 M avg. = 304 Meter.

02 Nos. 32 mm ∅ M.S. Rod Riser from Earth Grid to Aux. Mat (26 Nos.) & Electrodes (29 Nos.). 150 mm welding joint at Both End. (26x2 + 29x2) x 4 M avg. = 440Meter.