SPECIAL REPAIR/REPLACEMENT OF EARTHING (PHASE-I) AND PROVN OF CHEMICAL EARTHING AT STATION UNDER GE (AF) CHABUA

Amount

SCH 'A' PART-I

M&L for earthing complete with galvanized steel earth plate electrode 60 cm x 60 cm x 6 mm buried directly in ground vertically to a depth not less than 2.25 mtr below ground level with top edge of earth plate at a depth not less than 1.5 mtr below ground level connecting to galvanized iron or steel earth lead of GI Strip 25 X 4 mm by means of welding, nuts, bolts, check nuts and washers of galvanized iron or steel, earth strip protected by galvanized Iron pipe 40 mm dia (medium grade) and connected to main switch board or main control panel (up to7.5 mtr) as directed and as specified incl concrete pit in PCC (1:3:6) type C1 pre-cast RCC (1:2:4) cover slab 5 cm thick of size as shown reinforced with 8 mm dia TMT deformed bars 100 mm c/c both ways incl one handle made of 12 mm dia MS bars of length 500 mm, funnel with wire mesh, 20 mm bore galvanized iron pipe light grade for watering, charcoal and salt in alternate layers 15 cm incl necessary earth work complete all as shown in elect plate No 3 of SSR Part I, including demolition of existing unserviceable earthing, complete all as specified and directed. Note:-Taking down old unserviceable depilated GI earthing of any description included in quoted rate.

M&L for Earthing complete with copper earth plate electrode 60cm x60 cm x 3.15 mm thick buried directly in ground (earth pit not less than 2.25 m deep below ground level) with top edge of the plate not less than 1.5 meter below normal ground level connected to copper earth strip of size 25 x 3 mm by means of brass bolts nuts, check nut and washers and GI tubing 40 mm bore, light grade for earth lead protection up to main earth test point and including concrete pit in PCC (1:3:6) type C 1 pre cast RCC (1:2:4) type B1 cover slab 400 x 400 x 50 mm with one handle for lifting made out of 8 mm dia MS bar, wire mash, 20 mm bore GI tubing(L.G.) for watering, charcoal or coal and salt in alternate layers including excavation earth work complete all as specified and directed Electrical plate no 3 of SSR Part-I including demolition of existing unserviceable earthing, complete all as specified and directed. Note:-Taking down old unserviceable depilated copper earthing of any description included in quoted rate.

M&L for maintenance free chemical earthing system complete with 03 (three) Nos. copper bonded rods, 17.2 mm dia 3000 mm long electrode buried at suitable distance apart directly in ground, to bore holes of 120 mm dia vertically to a depth not less than 3.60 mtr deep below ground level with top edge of earth electrode at a depth not less than 100 mm below normal ground level, provision of clamps or brazed or both for each copper bonded rods made of cupper and copper strip of size 25 x 3 mm & strip connection on the top of the electrode and copper strip of size 25 x 3 mm for inter connection of 03 nos copper bonded rods and laying at least 500 mm below in the ground and further connected to test point terminal block (copper strip and test terminal block shall be measured separately), including back filling of bore holes with advanced earth enhanhencing compound 96 kilogram (minimum) for artificial treatment to soil so as to achieve earth resistance below 01 Ohms as specified in para 19.140 of SSR Part-1 (2009), including provision of earthing pit in PCC(1:3:6) type C1 pre-cast cover RCC slab of size 400 x 400 x 50 mm with one handle made out of 8 mm dia round bar, including necessary earth work and three coats of white wash on plastered surface (exposed surfaces) and testing complete all as directed and including necessary earth work and testing complete all as specified and directed. Note:-Taking down old unserviceable dilapidated chemical earthing is included in quoted rate.

Supply and fixing copper strip of size 25 x 3 mm with saddles with required porcelian insulator, fixing screws etc. for roof conductors and down conductors complete all as specified and directed.

Supply and fixing GI strip of size 32 x 6 mm with saddles with required porcelian insulator, fixing screws etc. for roof conductors and down conductors complete all as specified and directed.

S&F in repair Test point terminal made of copper size 150 mm x 25mm x 3mm, drilled and screwed including 3 Nos. 8 mm dia. screw hex. Head screw and MS cover made of 2mm thick sheet including provision for entry/exit of earth strip complete all as specified and directed. Note:- Copper strip &Test point bonded by brazing.

S&F in repair Test point terminal made of Galvanized iron, size 150 mm x 32mm x 6mm, drilled and screwed including 3 Nos. 8 mm dia. screw hex. Head screw and MS cover made of 2mm thick sheet including provision for entry/exit of earth strip complete all as specified and directed.

S&F GI tube light grade 50mm dia with all fitting and laid in floors, under road, pavement or hard standing for protection of earthing strip including taking out old GI pipe complete all as specified and directed.

All as per item No. 1.8 here in before but 40 mm bore complete all as specified and directed.

SCH 'A' PART-II

M & L for maintenance free chemical earthing system complete with 03 (three) nos copper bonded rods, 17.2 mm dia 3000 mm long electrode buried at suitable distance apart directly in ground, to bore holes of 120 mm dia vertically to a depth not less than 3.60 mtr deep below ground level with top edge of earth electrode at a depth not less than 100 mm below normal ground level, provision of clamps or brazed or both for each copper bonded rods made of copper and copper strip of size 25 x 3 mm & strip connection on the top of the electrode and copper strip of size 25 x 3 mm for inter connection of 03 nos copper bonded rods and laying at least 500 mm below in the ground and further connected to test point terminal block (copper strip and test terminal block shall be measured separately), including back filling of bore holes with advanced earth enhanhencing compound minimum 96 kg (minimum) for artificial treatment to soil so as to achieve earth resistance below 01 Ohms as specified in para 19.140 of SSR Part-1 (2009), including provision of earthing pit in PCC(1:3:6) type C1 pre-cast cover RCC slab of size 400 x 400 x 50 mm with one handle made out of 8 mm dia round bar, including necessary earth work and three coats of white wash on plastered surface (exposed surfaces) and testing complete all as directed and including necessary earth work and testing complete all as specified and directed.

Supply and fixing copper strip of size 25 x 3 mm with saddles with required porcelian insulator , fixing screws etc. for roof conductors and down conductors complete all as specified and directed.

S&F Test point terminal block made of copper size 300 mm x 32mm x 6mm, drilled and screwed including 3 Nos. 8 mm dia. screw hex. Head screw and MS cover made of 2mm thick sheet including provision for entry/exit of earth strip complete all as specified and directed. Note:- Copper strip & Test point bonded by brazing and measured separately.

Material & labour for brazing work for copper strip &Test point terminal of chemical earthing complete all as specified and directed.

S&F GI tube light grade 50mm dia with all fitting and laid in floors, under road, pavement or hard standing for protection of earthing strip complete all as specified and directed.

M & L for porcelain insulator suitable for fixing of copper strip on roof/wall with necessary drilling and providing two nos screw for fixing complete all as specified and directed.

Schedule of Credit

J D construction

FREEZCON

Bimal Trading Company

M/S R G Construction

S K ENTERPRISE