REPAIR/ MAINT REPLACEMENT EARTHING INFRASTRUCTURE, LIGHTING ARRESTOR, STRIPS AND ALLIED WORKS AT TECHNICAL AREA 19 WING AND 14 BRD AF STATION UNDER GE(AF) BORJHAR

Amount

Taking down old unserviceable Earthing pit of any type with accessories including removing of demolished material from work site at any distance out side MD land complete all as specified and as directed.

Material and labour for earthing with galvanised earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly in ground vertically to a depth of not less than 2.25 mtr below ground level connected to galvanised iron strip 25 mm x 4 mm thick, by means of nut, bolts and washers made out of galvanised iron mild steel and 50 mm dia GI pipe "light grade" for protection of earth lead and connected to control board or transformer neutral earth or as directed including earthing pit in PCC (1:3:6) type C-1, pre-cast reinforced cover with MS XPM Jalli, RCC 1:1.5:3 cover slab of size 300 mm x 300 mm x 100 mm thick, with one handle made out of 8 mm dia round bar 20 mm dia GI pipe light grade for watering funnels , wire mesh and provided charcoal or coke of alternative layers of 15 cm including necessary earth work complete shown in electrical plated No 3 and testing complete all as specified and as directed.

Material and labour for earthing with galvanised earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly in ground vertically to a depth of not less than 2.25 mtr below ground level connected to galvanised iron strip 32 mm x 6 mm by means of nut, bolts and washers made out of galvanised iron mild steel and 50 mm dia GI pipe "light grade" for protection of earth lead and connected to control board or transformer neutral earth or as directed including earthing pit in PCC (1:3:6) type C-1, pre-cast reinforced cover with MS XPM Jalli, RCC 1:1.5:3 cover slab of size 300 x 300 x 100 mm with one handle made out of 8 mm dia round bar 20 mm dia GI pipe light grade for watering funnels , wire mesh and provided charcoal or coke of alternative layers of 15 cm including necessary earth work complete shown in electrical plated No 3 and testing complete all as specified and as directed. NOTE : For Item 2 & 3 (i) The earthing pit should be provided with proper earth pit and pit cover. Pit cover should be painted with synthetic enamel paint of approved colour and pit number to be marked on a GI plate above 45 cm from GL as per colour code followed in AF Station. (ii) If the desired earth registance is not achive during testing as per IS the complete earthing shall be carried out by the contractor at his own cost and no extra claim shall be admissable.

Material and labour for Chemical earthing complete with copper earth plate electrode of size 90 cm x 60 cm x 5.0 mm buried directly in ground (earth pit not less than 2.25 m deep below the normal ground level) with top edge of plate not less than 1.5m below normal GL connected to copper earth strip 32x 6 mm,all as shown on electrical plate No. 4 of SSR Part - 1, using 5 Nos alternate layers of charcol and salt crystal and a final layer of Magnesium sulphate of 5 cm thickness to be provided and connected to earth test point including 25 mm dia GI med grade pipe for watering with funnel and wire meshed and 63 mm dia GI light grade pipe for protection of earth strip and providing water supply connection from nearest water supply point and testing complete all as specified and as directed.

Note : (i) The unit rate shall deemed included for earth work in hard / dense soil, PCC (1:2:4) type B-1 chamber, RCC (1:1.5:3) cover 50mm thick reinforced with 8mm dia TMT bars @ 150mm c/c both ways, funnel with watering pipe 25mm dia medium grade, GI protection pipe light grade 63mm dia, and wire mesh complete in addition to item No. 1 (a) to (e) of preamble (notes) under sub - heading earthing, specified on SI. page No. 422 of SSR Part-II. (ii) The earthing pit should be provided with proper earth pit and pit cover. Pit cover should be painted with synthetic enamel paint of approved colour and pit number to be marked on a GI plate above 45 cm from GL as per colour code followed in AF Station. (iii) If the desired earth registance is not achive during testing as per IS the complete earthing shall be carried out by the contractor at his own cost and no extra claim shall be admissable.

Material and labour for earthing with copper earth plate electrode 600 mm x 600 mm x 6 mm thick, (3.15) burried directly in ground vertically to a depth of not less than 2.25 mtr below ground level connected to copper strip of size 20 x 3 mm as earthing lead means of nut, bolts and washers made out of galvanised ireon mild steel and 40 mm dia GI pipe "light grade" for protection of earth lead and connected to contoll board or main switch or as directed by Engr -in-Charge including earthing pit in PCC (1:3:6) type C-1, pre-cast reinforced cover with MS XPM Jalli, RCC 1:1.5:3 cover slab of size 300 x 300 x 100 mm with one handle made out of 8 mm dia round bar 20 mm dia GI pipe light grade for watering funnels , wire mesh and provided charcoal or coke of alternative layers of 15 cm including necessary earth work complete shown in electrical plated No 3 and tesing complete all as specified and as directed. NOTE : (i) The earthing pit should be provided with proper earth pit and pit cover. Pit cover should be painted with synthetic enamel paint of approved colour and pit number to be marked on a GI plate above 45 cm from GL as per colour code followed in AF Station. (ii) If the desired earth registance is not achive during testing as per IS the complete earthing shall be carried out by the contractor at his own cost and no extra claim shall be admissable.

Material and labour for earthing with galvanised earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly in ground vertically to a depth of not less than 2.25 mtr below ground level connected to galvanised earth lead wire 4.0 mm by means of nut, bolts and washers made out of galvanised iron mild steel and 15 mm dia GI pipe "light grade" for protection of earth lead and connected to control board or transformer neutral earth or as directed including earthing pit in PCC (1:3:6) type C-1, pre-cast reinforced cover with MS XPM Jalli, RCC 1:1.5:3 cover slab of size 300 x 300 x 100 mm with one handle made out of 8 mm dia round bar 20 mm dia GI pipe light grade for watering funnels , wire mesh and provided charcoal or coke of alternative layers of 15 cm including necessary earth work complete shown in electrical plated No 5 and testing complete all as specified and as directed. NOTE : (i) The earthing pit should be provided with proper earth pit and pit cover. Pit cover should be painted with synthetic enamel paint of approved colour and pit number to be marked on a GI plate above 45 cm from GL as per colour code followed in AF Station. (ii) If the desired earth registance is not achive during testing as per IS the complete earthing shall be carried out by the contractor at his own cost and no extra claim shall be admissable.

Taking down of old unsv / Serviceable copper and Galvinised stripe of any size

Supply and fixing in repair for 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 for 20 mm x 3 mm thick, copper strip using porcelain clit/post insulators, complete all as specified and directed.

All asper item no 8 but fixing only new Porleain insulator complete all as directed

Supply and fixing in repair for 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 for 32 mm x 6mm thick, copper strip using porcelain clit/post insulators, complete all as specified and directed.

All as per item no 10 but fixing only new Porleain insulator complete all as directed

Supply and fixing in repair for 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 for 25 mm x 4 mm thick, galvanised iron strip using porcelain clit/post insulators, complete all as specified and directed.

All as per item no 12 but fixing only with new Porleain insulator complete all as directed

Supply and fixing in repair for 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 for 32 mm x 6 mm thick, galvanised iron strip using porcelain clit /post insulators, complete all as specified and directed.

M & L for 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 4 mm dia galvanised iron or steel wire

All as per item no 15 but fixingin repair only

Taking out of old GI Tubing of any grade and size in trenches/floor/fixed to pole for earth protection complete all as specified and directed.

Supply and fixing GI tubing, 32 mm dia bore, light grade with all fittings laid in trenches or fixed to wall including taking down of existing pipes and removal from site complete all as specified and directed.

Supply and fixing test point terminal block made of gun metal or phosphorous bronze, size 75mm x 75mm x 25 mm thick, drilled and screwed including 3 Nos. 8 mm dia. 25 mm long hexagonal head screws, including MS box 2 mm thick of suitable size for protection of test point terminal, including dismantling of old unserviceable test point complete all as specified and directed.

Supply and fixing GI tubing, 20 mm dia bore, medium grade with all fittings laid in trenches including taking down of existing pipes and removal from site complete all as specified and directed.

Supply and fixing bib tap, self closing type of cast iron or malleable cast iron, galvanised screw for fixing to iron pipe of size 20 mm dia including taking down of existing bib tap and removal from site complete all as specified and directed.

Excavating in trenches not exceeding 1.5 mtr wide and not exceeding 1.5 mtr in depth for taking out/laying of under ground cable and getting out in saft/loose strata complete all as specified and as directed

Returning filling in including spreading watering levelling and well ramming in layers not exceeding 25 cm in soft/ loose soil complete all as specified and as directed

Removing surplus excavated soil nexc 50 mtr and depositing where directed at a level not exceeding 1.5 mtr above the starting point complete all as specified and as directed

Material and labour for checking of existing old earthing pits and lightening conductors and repairs/replacement of GI/Aluminium strips where found corroded and repairs to pits and testing of earth resistance value and pouring salt/charcol for obtaining earth value below 5 ohm complete all as specified and as directed

Taking down of old unsv / Serviceable copper and Galvinised air terminal complete all as directed

Supply and fixing in repairs Air termination, single pointed, copper rod 12mm dia and 300mm long fixed on copper strip for earth conductivity to ground complete all as specified and as directed

All as per item no 27 but fixingin repair only

Material and labour for GI tubing, 20 mm dia bore, Light grade with all fittings laid in trenches including taking down of existing pipes and removal from site complete all as specified and directed.

All as per item no 29 but of size 25 mm dia

Material and labour for GI tubing, 40 mm dia bore, Light grade with all fittings fixing on top of the building for fixing of Air terminal including taking down of existing pipes and removal from site complete all as specified and directed.

Material and labour for Earth pit marking sheet made of MS black sheet of size 150 mm x 150 mm x 6 mm including 16 mm dia rod weldede to sheet including painting and lettering as directed by EIC

Supply only Common salt commercial

Supply only Charcoal dust/Breeze

Supply only Mild steel wires, galvanised

Supply only Galvinised steel earth plate, size of 60 cm x 60 cm x 6.00 mm

Supply only Copper plate, size of 60 cm x 60 cm x 3.15 mm

Supply only Chemical for Chemical earthing pit

Supply and Fixing centrifugally Cast Iron Earthing Electrode of size 75 mm dia 2.90 RM length with G I clamp (HDG) and funnel complete all as directed

Supply only Back fill compound suitable for earthing completem all as directed

Material and labour for cast iron pit cover of suitable GI and Copper Earthing complete as per directed

Cutting vegetation and surface dressing not exceeding 15 cm deep including removing the materials to a distance not-exc 60 mtr complete all as specified and directed. (Note :- Item shall be executed twice in each installation and quantity is given for two operation. However unit rate to be quoted by the tendered for single operation only)

Material and labour for earthing pit in PCC (1:3:6) type C-1, pre-cast reinforced cover with MS XPM Jalli, RCC 1:1.5:3 cover slab of size 300 mm x 300 mm x 100 mm thick, with one handle made out of 8 mm dia round bar including necessary earth work and white waching complete all as specified and as directed.

Ms Sukumar Talukdar and Co.