REPAIR /MAINTENANCE OF EARTHING SYSTEM AND LIGHTNING PROTECTION SYSTEM AT AF STN PALAM UNDER GE (AF) PALAM, DELHI CANTT-10

Amount

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

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

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

S&F for copper strip 20mm x 3mm for earth continuity conductor with and including porcelain holder insulator for support on wall / roof etc with suitable size screws, nut bolts etc complete all as specified.

S&F for galvanised iron strip 32mm x 6mm with and including porcelain holder insulator for support on wall / roof etc with suitable size screw, nut bolts etc complete.

M&L for aluminium strips 25mm x 6mm with and including porcelain holder insulator for support on wall, roof, hangar roof and walls of any height etc with suitable size screw, nut bolts etc complete.

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

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

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

Supply & Fixing in replacement of GI pipe medium grade 20 mm dia with all fittings for laying in trenches, wall, floor etc complete all as specified.

M & L in replacement of earthing complete with copper earth plate electrode 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 soil/ latrite rock, cement concrete 1:3:6 type C-2 in chamber with 50mm thick chamber cover RCC 1:1.5:3(nominal mix) type A-1 with 8 mm dia TMT reinforcement at 100mm c/c, watering pipe 20mm dia GI pipe medium grade, protection pipe for copper strip 40mm dia GI medium grade, 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 site requirement is not obtained, the earthing shall be re-done by contractor without any extra cost to Govt).

Supply, installation, testing & commissioning in replacement of maintenance free earth (grounding) electrode of size 100 mm dia x 9000 mm long with 17.2 mm 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 ration 3:1 to achive result of earth resistance value below 5 Ohms. Encase or backfill the voids surrounding the 17.2 mm Cu Bonded MS conductor or other metal components placed in augured bore hole of 100 mm dia x 9000 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 all as specified.

Supply, installation, testing & commissioning in replacement of maintenance free earth (grounding) electrode of size 100 mm dia x 6000 mm long with 17.2 mm Cu Bonded MS Conductor pre cast 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 achive result of earth resistance value below 5 Ohms. Encase or backfill the voids surrounding the 17.2 mm Cu Bonded MS conductor or other metal components placed in augured bore hole of 100 mm dia x 6000 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 all as specified.

Supply, installation, testing & commissioning in replacement of maintenance free earth (grounding) electrode of size100mm dia x 15 mtr long with 17.2 mm Cu Bonded MS Conductor pre cast or in-situ cast in high purity electrically conductive granular material having ultra low resistive value of 0.02 Ohm-m. Electrode made of conductive earth enhancing material mixed with cement in the ration 3:1 to achive result of earth resistance value below 2 Ohms. Encase or backfill the voids surrounding the 17.2 mm Cu Bonded MS conductor or other metal components placed in augured bore hole of 100 mm dia x 15 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 componets of the earthing systems, 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. Electrode's top terminal be sealed permanently packed with conductive concrete and Cu bonded MS / copper strip taken out be terminated on to earth test point and eqpt terminal all as specified.

Supply, installation, testing & commissioning in replacement of maintenance free earth (grounding) electrode of size100mm dia x 30.5 Mtr long with 17.2 mm Cu Bonded MS Conductor pre cast 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 achive result of earth resistance less then 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 100 mm 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 systems, 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. Electrode's top terminal be sealed permanently packed with conductive concrete and Cu bonded MS / copper strip taken out be terminated on to earth test point and eqpt terminal complete all as specified.

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 32mm x 6mm as earth lead by means of nuts, bolts, thimbles, chuck nuts, washers of GI or steel, including cement concrete chamber in 1:3:6 type C-1 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 in 1:2:4 type B-1 using 20 mm graded stone aggregate reinforced with XPM, JALLI, charcoal, dust and common salt etc 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 GI pipe medium grade and watering pipe 20mm bore GI medium grade including all excavation and earth work & connecting the earthing to an earthing test point complete all as specified & directed by Engr-in-Charge. (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 site requirement is not obtained, the earthing shall be re-done by contractor without any extra cost to Govt).

M & L for GI pipe medium grade 40 mm bore 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 all as specified and directed by Engr-in-Charge.

M&L in replacement of damaged earth pit cover made of RCC 1:2:4 type B-1 of size 320mm x 320mm x 50mm thick reinforced with XPM JALLI including all excavation work and connecting the earthing to an earthing test point complete all as specified and directed by Engr-in-Charge.

Taking down GI/ copper/ aluminium earth strip, cleaning the strip, clearing any nearby vegitation/ soil / rubber etc and refixing the same including replacement of rusted nuts, bolts and broken insulators with new one complete all as specified.

Labour for checking of earth resistance value of GI/ copper maintance free earthing located at various places under Air Force Stn Palam with earth tester, duly calibrated by Govt or Govt approved testing laboratory including opening and re-connecting of test terminals and recording the results in the registers maintained by AGE E/M every month all as specifed and directed by Engr-in-Charge (Note : The Contractor shall provide one electrician and one helper along with earth tester and accessories. The cost of the same is deemed to be included in the quoted rate of item). Note for item No. 12 to 15 :- (i) Test certificate of earthing materials 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 desired resistance value for period of min 25 years after commissioning shall be provided by contractor. (iv) Test link of size 50 mm X 6 mm X 200 mm, RCC pit cover including brazing of all the joints upto test point complete all as specified and directed by Engr-in-Charge. (v) 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 site requirement is not obtained, the earthing shall be re-done by contractor without any extra cost to Govt. (vi) Make of electrically conductive earthing material : MARCONITE/ ELANCRETE or it's equivalent as approved by Command Chief Engineer/ E-in-C Branch with same earthing category. The rates for above provision are deemed to be included in the quoted rates of the contractor and nothing extra shall be paid on this account.

M/S Anand Enterprises

DHAIRYAE ENTERPRISES

M/s Dhapola Elevator and Engineering

Mahesh Enterprises