REPAIR TO EARTHING INFRASTRUCTURE AT AIR FORCE STATION HIGHGROUND, BARWALA AND MULLANPUR UNDER AGE (I) HIGHGROUND CHANDIGARH

Amount

Material and labour for earthing complete with GI earth plate electrode of size 600mm x 600mm x 6mm thick burried directly in ground vertically (depth of pit not less than 2.25 m below normal ground level), with top edge of earth plate not less than 1.5m below normal ground level, earth plate surrounded from all sides by 15cm thick packed alternate layers of charcoal dust and common salt, electrode connections using galvanized iron strip of size 32mmx6mm thick (upto body of equipment) by means of nuts, bolts, check nuts & GI washers, connected to main switch board or main control board or test point, protected by galvanized iron pipe light grade 40mm dia bore, and watering pipe 20mm dia bore GI medium grade with funnel & wire mesh including all necessary excavation & earth work, PCC chamber in PCC (1:2:4) type B-1 & RCC cover, all as shown in electrical plate No 3 of MES Schedule Part-I (2009), testing on completion, complete including dismantling of existing earthing all as specified and directed. Note(s) :- (i) RCC pit cover shall be pre-cast of RCC (1:2:4) type B-1, 80mm thick reinforced with XPM not less than 4Kg/Sqm. (ii) PCC chamber shall be constructed 500 mm away from the edge of earth pit. (iii) Rate shall include GI strip and protection pipe of length 7.5m, excess beyond 7.5m length required at site shall be measured and paid separately. (iv) Earth resistance should be less than 1 Ohm. In case the test results are not found below 1 Ohm, complete earthing will be redone without any extra cost to Govt.

Same as Srl Item no 1 above but by using 60×60cm ×3.15mm thick electrode and 20×3mm copper strip as earthing lead complete all as specified and directed.

Material and Labour for Chemical earthing with copper pipe electrode 3.0 metre long having outer pipe dia 80 mm and inner pipe dia 50 mm duly filled with highly conductive and anti corrosive compound of required quantity having chemical compostion Bentonite 40%, copper sulphate 20%, Gypsum 5%, Graphite 10%, Alum 5%, Zinc Sulphate 10% and Aluminium Sulphate 10% buried in ground by digging a bore of 150 mm dia surrounded by soil friendly backfill compound non soluble in water including connection with copper earth strip 32 x 6 mm upto 7 metre length, making PCC pit of size 0.3 m x 0.3 m x 0.3 m inner size in PCC 1:3:6 type C1 with 40 mm thick cover in RCC 1:2:4 type B-1 reinforced with 6 mm dia MS bars 3 Nos both ways with lifting hook made out of 8 mm dia bar and testing on completion to achive value not more than 1 Ohm complete all as specified and directed.

Material and labour for earthing complete with GI earth plate electrode of size 600mm x 600mm x 6mm thick burried directly in ground vertically (depth of pit not less than 2.25 m below normal ground level), with top edge of earth plate not less than 1.5m below normal ground level, earth plate surrounded from all sides by 15cm thick packed alternate layers of charcoal dust and common salt, earth lead GI wire 4 mm dia by means of bolts, nuts, check-nuts and washers of galvanized iron and of earth wire protected by galvanized iron pipe light grade 15mm bore and water pipe 20 mm bore GI medium grade with funnel and wire mesh complete including excavation and earth work, PCC chamber and cover in cement concrete 1:3:6 type C-1 using 20 mm graded stone aggregate in lieu of CI cover and frame etc all as specified and shown in electrical plate No. 3 of SSR-2009 (Part-I), testing on completion, complete including dismantling of existing earthing all as specified and directed. Note(s) :- (i) RCC pit cover shall be pre-cast of RCC (1:3:6) type C-1, 80mm thick reinforced with XPM not less than 4Kg/Sqm. (ii) PCC chamber shall be constructed 500 mm away from the edge of earth pit. (iii) Rate shall include GI strip and protection pipe of length 7.5m, excess beyond 7.5m length required at site shall be measured and paid separately. (iv) Earth resistance should be less than 1 Ohm. In case the test results are not found below 1 Ohm, complete earthing will be redone without any extra cost to Govt.

Supply and fix Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 25 mm x 4 mm Galvanised iron Strip complete all as specified and directed.

Material and Labour for aluminum strip 25x3mm as in earth continiouty conductor all as specified and directed.

Supply and fix Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 20 mm x 3 mm copper strip complete all as specified and directed.

Material and Labour for test point made out of GI strip 50 mm x 6 mm, 200 mm long brass nut bolts-02 Nos and 12 mm dia GI nut bolts 40 mm long-03 Nos complete all as specified and directed.

Material and Labour for test point made out of copper strip 32 mm x 6 mm, 200 mm long brass nut bolts-02 Nos and 12 mm dia GI nut bolts 40 mm long-03 Nos complete all as specified and directed.

Material and Labour for air termination ,single pointed aluminum rod 12mm dia and 300 mm long fixed in old GI pipe bracket complete all as specified and directed.

Material and Labour for PCC 1:3:6 Type C-I using 20mm graded agrgate for PCC of size 0.3mx0.3mx0.25m with for mounting GI pipe 40mm dia complete all as specified and directed.

Note: The total amount shall subject to adjustment of credit of Rs 53210.00 for old Materials as per Schedule of Credit

R D Bansal

PARTAP ENGINEERING WORKS

Babu Ram Sud and Sons