GENP-50/2020-21 REPAIR /MAINTENANCE OF OF EARTHING SYSTEM AND LIGHTNING PROTECTION IN THE AREA OF AGE E/M-I UNDER GE (AF) PALAM, DELHI CANTT-10

Amount

Taking out unserviceable/damaged Galvanised Iron /Copper strips of any description and in any position from hanger , roof, wall etc in any height all as specified and directed by Engr-in-Charge

Taking out unserviceable/damaged aluminium strips of any description and in any position from hanger , roof, wall etc in any height all as specified and directed by Engr-in-Charge

Taking out unserviceable/damaged air termination rod of copper/aluminium in any shape or size from hanger , roof, wall etc in any height all as specified and directed by Engr-in-Charge.

S&F for copper strip of size 20 x 3mm for earth continuity conductor including fixing on porcelain holder insulator for support on wall / roof etc with suitable size screw , nut bolts etc complete all as sprecified and directed by Engr-in-Charge.

S&F for galvanised iron strip of size 32x6mm including fixing on porcelain holder insulator for support on wall / roof etc with suitable size screw , nut bolts etc complete all as specified and directed by Engr-in Charge.

S&F for aluminium strip of size 25x6 mm including fixing on porcelain holder insulator for support on wall / roof etc with suitable size screw , nut bolts etc complete all as specified and directed by Engr-in-Charge.

S&F for air termination, single pointed,copper rod 12mm dia and 300mm long complete all as specified and directed by Engr-in-Charge .

S&F for air termination, single pointed,aluminium rod 12mm dia and 300mm long complete all as specified and directed by Engr-in-Charge .

S&F in replacement of test point terminal block made of gun metal or phosphorus bronze of size 75mmx75mmx25mm drilled and screwed including 3 Nos. 8 mm dia 25mm longh head screw complete all as specified and directed by Engr-in-Charge.

S&F in replacement of PVC insulated multistranded single core copper conductor 1100 Volt grade FRLS of size 25 Sqmm with jointing with appropriate size of copper cable lugs and nut , bolt etc complete all as specified and directed by Engr-in-Charge .

S&F in replacement of PVC insulated multistranded single core copper conductor 1100 Volt grade FRLS of size 10 Sqmm with jointing with appropriate size of copper cable lugs and nut , bolt etc complete all as specified and directed by Engr-in-Charge .

Supply & fixing in replacement of GI pipe medium grade 15 mm dia with all fittings for laying in trenches, wall, floor etc all as specified and directed by Engr-in-Charge.

M & L for earthing complete with copper earth plate electric 60 cm x 60 cm x 3.15mm buried directly and vertically 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 m below normal ground level connected to Copper strip 20mm x 3 mm as earth lead by means of bolts, nuts, check nuts and washers of galvanised steel and including necessary earth work in any type of earth/rock, PCC 1:3:6 type C-2 in chamber and 50mm thick precast chamber cover of RCC 1:2:4 type B-1 with 8 mm dia TMT reinforcement at 100mm both ways, 20mm dia GI watering pipe ,40mm dia GI light grade protection pipe for copper strip , salt, coal, magnesium sulphate and water funnel etc complete all as per Electrical plate No 4 of SSR Part I.( NOTE:-To obtained earth resistance value and prepare test sheet of newly constructed earth pit shall be the responsibility of contractor. If the desired earth resistance as per equipment requirement is not obtained, the earthing shall be re-done by contractor without any extra cost to the Govt .

Supply, installation, testing & commissioning of maintenance free earth (grounding) Elancrete electrode of size 85mm Dia x 3000 mm long with 17.2 mm Copper Bonded MS Conductor precast or in-situ cast in high purity electrically conductive granular material having ultra low resistive value of 0.001 Ohm-m. Electrode made of conductive earth enhancing material mixed with cement in the ration 3:1 to encase or backfill the voids surrounding the 17.2 mm Cu Bonded MS conductor or other metal components placed in augured bore hole of 85 mm dia x 3000 mm depth, resulting to increase in the effective surface area of the earth electrode or grids to lower the resistance. Earth enhancing material should not leach chemicals into the adjacent soil or underground water channels and should be in pH neutral range. Earth enhancing material should permanently protect the encased metal componets of the earthing systems. All hardware like nuts, bolts and washers should be of Stainless steel. Electrode should withstand fault current upto 35 KA for 1 second. Electrode's top terminal be sealed permanently packed with conductive concrete and Cu bonded MS / GI extension strip taken out be terminated on to earth bus bar.

Supply, Installation, testing and commissioning of maintenance free earth (grounding) electrode of size 100mm Dia x 30.5 Mtr long with 17.2mm Cu bonded MS conductor precast or in-situ cast in high purity electrically conductive granular material having ultra low resistive value of 0.001 Ohm-m. Electrode made of conductive earth enhancing material mixed with cement in the ratio 3:1 to achieve result of earth resistance less than 1 Ohm encase or backfill the voids surrounding the 17.2 mm Cu bonded MS conductor or other metal components placed in augured bore hole of 100mm dia x 30.5 Mtr depth, resulting to increase in the effective surface area of the earth electrode or grids to lower the resistance. Earth enhancing material should not leach chemicals into the adjacent soil or underground water channels and should be in pH neutral range. Earth enhancing material should permanently protect the encased metal components of the earthing system, copper bonding on MS rod should be minimum 250 microns. All hardware like nuts, bolts and washers should be of stainless steel. Electrode should withstand fault current upto 35 KA for 1 second. Electrodes top terminal be sealed permanently packed with condutive concrete and Cu bonded MS/copper strip taken out be terminated on to earth test point and equipment terminal. Test certificate of NABAL laboratory shall be submitted by the contractor, test link of size 50mm x 6mm x 200mm, RCC pit cover including brazing of all the joints upto test point complete, all as specified and directed by Engr-in-Charge. Make : Marconite. Note :- (i) Test certificate of earthing material from certified NABL laboratory shall be submitted by the contractor & verified by Engr-in-Charge. Test certificates shall be kept in record by Engr-in-Charge. (ii) Payment of Earthing shall be allowed only if result of earth resistance is achieved below 01 (one) Ohm. (iii) Manufacturers warranty for performance of resistance value less than 01 Ohm for period of min 25 years after commissioning shall be provided by contractor.

M & L in replacement of earthing with galvanized mild steel earth plate electrode 60cm x 60cm x 6mm thick buried directly in ground (earth pit not less than 2.25 Mtr below ground level) with top edge of earth plate not less than 1.5 Mtrs below ground level connected to GI strip 32x6mm as earth lead by means of nuts, bolts, thimbles, chuck nuts, washers of GI or steel, including PCC (concrete chamber) of 1:3:6 type C-1 mix using 20mm graded stone aggregate with fair finish internal surface of concrete chamber with 15mm thick plaster in CM 1:4, funnel with wire gauge mesh, 80 mm thick RCC pit cover 320 mm x 320 mm of mix 1:2:4 type B-1 using 20 mm graded stone aggregate reinforced with XPM, JALLI and charcoal dust and common salt all as shown in electrical plate No 3 of MES SSR Part-I (2009) and specified including provision of GI strip protected by 40 mm dia medium grade pipe and watering pipe of 20mm bore medium grade and including all excavation and earth work & connecting the earthing to an earthing test point complete all as specified & directed by Engr-in-Charge.

M & L for GI pipe medium grade 40 mm dia with all fittings and welding works complete including taking out old unserviceable GI pipe all as specified and directed by Engr-in-Charge.

M&L for cement concrete 1:3:6 type C-1 using 20 mm graded stone aggregate complete all as specified and directed by Engr-in-Charge.

Bairagi Builders

AKAALTECH

BRIJ MOHAN LAL AND CO.

M/S Anand Enterprises

Shiv Shankar Nirman Co.