REPAIR MAINT OF CRITICAL EARTHING OF EQUIPMENTS, OTM BUILDINGS, LIGHTENING PROTECTION IN TECH AREA INCLUDING GRID EARTHING AT 33 KV MRS AT AF STN JODHPUR

M& for checking of earthing resistance of 150 Nos. critical earthing and E-N voltage monthly with caliberated earth tester meter and multimeter including recharging of earthing with chemical, maintaing the earth testing record, rectification of earthing related fault also complete all as specified and directed by the Engineer-in-Charge. Note:- (a) Testing record and rectification of earthing shall be signed by user and JE (E/M) and verified by Engineer-in-Charge. (b) Measurement of one month shall be treated as one Job. (c) Chemical required for recharging of earthing shall be measured and paid separately as supply only.

M&L for checking of earthing resistence of 1250 Nos. earthing and E-N voltage quarterly with caliberated earth tester meter and multimeter including recharging of earthing with chemical, maintaing the earth testing record, rectification of earthing related fault also complete all as specified and directed by the Engineer-in-Charge. Note:- (a) Testing record and rectification of earthing shall be signed by user and JE (E/M) and verified by Engineer in charge. (b) Measurement of three month shall be treated as one Job. (c) Chemical required for recharging of earthing shall be measured and paid separately as supply only.

Supply only of Potassium Nitrate (commercial name kalmi shora) in the earthing chambers for improvement of the existing earthing resistance complete all as specified and directed by the Engineer-in-Charge.

M&L in repairs for earthing complete with galvanised steel earth electrode 60cm x 60cm x 6mm buried directly in ground vertically to depth not less than 2.25m deep below normal ground level with top edge of the earth plate at a depth not less than 1.5m below ground level connected to and including GI earth lead wire 4mm dia by means of nuts, bolts, check nuts and washer etc, made of GI and connected to test point and earth dolly all as shown in electrical plate No. 3 SSR Part-I 2009 and specified or indicated including excavation and earthwork in any type of soil PCC (1:3:6) type C1 in chamber, precast RCC 50mm thick in cement concrete (1:2:4) type B1, reinforced with welded steel wire fabric or XPM (Weight not less than 4.00 Kg/ Square metre) with PCC frame, funnel with wire mesh, 20mm bore medium grade GI watering pipe, lugs, 15mm bore medium grade GI protection pipe, test point etc. complete all as specified and directed. Note:- (i) Item includes the cost of 7.5 metre GI pipe for protection of earth lead. (ii) Item includes the cost of 7.5 metre GI earth lead.

M&L in repairs for earthing complete with copper earth plate electrode 60cm x 60cm x 3.15mm thick, buried directly in ground (earth pit not less than 2.25 metres deep below ground level) with top edge of the plate not less than 1.5m below normal ground level, connected to and including earth lead of copper strip 20mm x 3mm by means of bolts, nuts, check nuts and washers of galvanized iron or steel all as shown in electrical plate No. 3 of SSR Part-I connected to earthing test point all as specified or indicated including testing on completion and excavation and earth work in any type of strata, PCC (1:3:6) type C1 in chamber, precast RCC cover 50mm thick in cement concrete (1:2:4) type B1, reinforced with welded steel wire fabric or XPM (Weight not less than 4 Kg/ Sqm) with cast iron frame, funnel with wire mesh, 20mm bore GI pipe medium grade watering pipe, lugs, 40mm bore GI pipe medium grade protection pipe up to 7.5m complete all as specified and directed by the Engineer-in-Charge. Note:- (i) The quoted rate includes the cost of earth lead and GI protection pipe upto 7.5 Metres. (ii) Copper strip beyond 7.5 metre shall be measured and paid for separately.

M&L in repairs for earthing complete with galvanised steel earth electrode 60cm x 60cm x 6mm buried directly in ground vertically to depth not less than 2.25m below normal ground level with top edge of the earth plate at a depth not less than 1.5m below ground level connected to and including GI earth strip 32mm x 6 mm, by means of nuts, bolts, check nuts and washer etc, made of GI and connected to test point and earth dolly all as shown in electrical plate No. 3 SSR Part-I 2009 and specified or indicated including excavation and earthwork in any type of soil PCC (1:3:6) Type C1 in chamber, precast RCC 50mm thick in cement concrete (1:2:4) type B1, reinforced with welded steel wire fabric or XPM (Weight not less than 4.00 Kg/ Square metre) with cast iron frame, funnel with wire mesh, 20mm bore medium grade GI watering pipe, lugs, 40 mm bore medium grade GI protection pipe, test point etc. complete all as specified and directed by Engineer-in-Charge. Note:- The quoted rate includes the cost of earth strip and GI protection pipe upto 7.5 metres. (ii) GI strip beyond 7.5 metre shall be measured and paid for separately.

M&L in repairs for bore earthing 150mm dia buried by vertical boring machine, depth 50 mtr below ground level using earth electrode 50mm dia GI pipe medium grade duly drilled hole of 12mm dia ,15cm c/c on both side of the pipe including lowering in bore well upto the depth of 49mtr and one metre above the ground level. The pipe electrode should be filled around commercial salt, charcoal dust, copper sulphate and magnisium phosphate of 30 cm layer each upto the full length of pipe. The bore well should have 12 metre of length 150mm dia MS pipe 4.8mm wall thickness for protection of bore well. Welding of GI strip 50mm x 6mm on earth electrode, GI pipe 50mm dia upto the 10 metre below ground level and 15 metre from the bore well to test point gun metal and PCC foundation sorrounding the bore well 60cm x 60cm x 30cm complete all as specified and directed by Engineer-in-Charge. Note:- If GI strip required more than 35 metres then length exceeds 35 metres shall be measured and paid separately.

M&L in replacement for 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 25mm long hex. head screw as required with all accessories complete all as specified and directed by the Engineer-in-Charge.

M&L in replacement for copper strip 20mm x 3.15mm complete with, protection sleeves, saddles, seperator and fixing screws at surrounding inside and outside the building complete all as specified and directed by the Engineer-in-Charge.

M&L in replacement for galvanised steel strip 32mm x 6mm complete with, protection sleeves, saddles, seperator and fixing screws at surrounding inside and outside the building complete all as specified and directed by Engineer-in-Charge.