FOR BORE EARTHING OF SWITCHYARD AT 132 KV SUB STATION DADANAGAR, KANPUR UNDER ETD-I, GOVIND NAGAR KANPUR

BORE EARTHING OF SWITCHYARD AT 132KV S/S DADANAGAR, KANPUR

Boring with 150 mm dia casing pipe to a probable depth of 21.0 meter long from ground level with skilled and unskilled labour including all T&P, boring apparatus and supervision charges etc. required for proper completion of work.

Inserting 40x6 mm G.I. flat in 50 mm dia B-class (Jindal) ISI mark 6.0 meter long 3 pipe placed horizontally on ground and bolting the G.I. flat with 150 mm long 75x6 mm copper plate conical piece on and then bolting the G.I. flat with G.I. pipe in such a way that copper flat remains in contact with the pipe. Lowering of 6.0 meter long G.I. pipe with conical copper Plate connected and at bottom along with G.I. flat inside the pipe in boring of 150 mm G.I. pipe pieces by G.I. sockets along with 40x6 mm G.I. flat running inside the pipe by making 150 cm lap joints 75 mm above ground level. Taking out 40x6 mm G.I. flat from the upper end of pipe by making a cut of 45 mm wide up to a depth of 50 mm in upper portion of G.I pipe and providing 1 no. cap type G.I. socket on upper threaded portion of pipe for water pouring in the pipe at regular intervals filling the space.

Fabrication of M.S. electrodes out of 32 mm dia M.S. round 3.0 meter long having 150 mm long conical shape.

Excavation of pit of size 2.00 Mtr x 2.00 Mtr x 1.50 Mtr, and then filling it with coal and salt twice layer laying alternately (each layer 200Kg Dry Charcoal and 200Kg salt) and driven of M.S. electrodes of 32 mm dia 3.0 Mtr. long in the earth on four corner of the pit equal distance of 2.0 Mtr. long keeping the top of electrode 50 cm above the pit ground level, welding of 32 mm M.S. round pieces of 3 Mtr. long on all four sides of electrodes and 15 cm below of top of electrode by 8 Nos. U-type clamp of 50x6 mm M.S. flat connecting a piece of 3 Mtr. long 40x6 mm G.I flat on opposite side of square welding of 40x6mm G.I flat on opposite M.S. electrode driven in ground and connecting the 40x6 mm G.I. flat.

Note 1 :- G.I. Pipe, G.I. Flat, Copper Plate, Coal, Salt, Nut & Bolt shall be arrange by the contractor at his own cost. 2 :- Only M.S. Round & M.S. Flat shall be supplied by the department free of cost.