WORK OF BORE EARTHING FOR HV AND LV NEUTRAL BUSHING OF 132/33 KV, 63 MVA T/F (ATLANTA MAKE) AT 220 KV S/S MAJHOLA MORADABAD UNDER ETD II MORADABAD.

Amount

THE FOLLOWING WORKS ARE TO BE CARRIED OUT OF 220 KV S/S MAJHOLA, MORADABAD.

Boring with 150 mm dia casing pipe to a 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 36/40 mm dia M.S. round 3.0 meter long having 150 mm long conical shape.

Excavation of pit of size 3.50 M x 3.50 M x 1.50 M. driven of M.S. electrodes of 36/40 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 36/40 mm M.S. round pieces of 3.05 Mtr. long on all four sides of electrodes and 15 cm below of top of electrode by 8 Nos. U-type clamp of 75x10 mm M.S. flat connecting a piece of 3.05 Mtr. long 75x10 mm G.I flat on opposite side of square welding of 75x10 mm G.I flat on opposite M.S. electrode driven in ground and connecting the 75x10 mm G.I. flat.

QASIM ENGINEERING COMPANY

TIRUPATI ELECTRICALS