RM/JRO/LOAN FUND/E/19-20/23

Amount

Earth work in excavation in all kind of soil in making trenches 450 m. m. in width and 1000 m.m. in depth from Ground Level for laying of M. S. flat.

Supply and delivery og M.S flat 75x12 of weight 7.097KG/mtr for construction of earth mat

Celing shaping (as per site requirement) of M. S. flat 75x12 mm and laying inside. The trenches and there after lap joining (125 mm lapping of each piece with the other) by electric welding to make the mat mechanically and electrically continuos. Electric tag welding shall be done by continous process. Zinc Chromate paint should be applied on the welded portion immediately after jointing.As per approved drawing.

Inter connection of the earth mat electrode with earth mat. The work has to be carried out in the above manner as describ ed under sl. No. (2) above.

Drawing of earth riser with 65x6 mm M. S. flat as described under sl. No. (2) above from the earthmat to each of the structures and all the equipment i. e. PTR, 33 kv VCB, CT, PT, LA,All 4-pole structure in 33kv switchyard, 11kv composite structure, sheilding structure etc. M. S flat of 65x6 to be collected from Jalpaiguri Divisional store.

Supply and delivery of perporated G.I pipe (Medium duty as per BIS) of 40mm dia. 3mtr long with perporations of 12mm dia holes at 150mm from each of other at right angle alongwith removable type top cap and 250mm clamp with nuts & bolts complete as per IS.

Construction of inspection pit of each earth station of size 300*300*300 mm (inside measurement) with 250 mm thick brick work in cement morter (1:4) 12 mm thick cement plaster (4:1) in the inter wall surface and upto 150 mm below the ground level of the outer surface. The pit Will be covered with pre cast RCC slab 50 mm thick (4;2:1) re - inforced with 10 mm dia M. S. rounds 100mm center to center both ways including lifting lug of 10 mm dia M.S. rounds at the middle of the slab with proper finish of the slab from all sides as per direction of the site - in - charge (all materials shall be supplied by the contractor)

Drawing of earth bus with 65x6 mm MS flat should be fixed vertically on the side wall of the control room trenches providing 100 mm gap between side wall of the trench on porcelain cheer which is fixed on side wall by masonry work with nuts & bolts and earth led portion of the earch bed to be kept in side trenchshould have 9/16 " hole drilled 150 mm apart to faclitate earth connection of the equipment's installed inside the control room. Drawing of earth bus through trenches should follow standard practice and as per direction of site - in - charge and connecting Panels(33kv & 11kv), ACDB,DCDB,Charger etc through 65x6 MS Flat (all materials shall be supplied by the party.)

M/S DUTTA ELECTRICALS

M/S KAR ENTERPRISE