8573/E8 REPAIR/MAINT OF EARTHING, LIGHTNING PROTECTION SYSTEM, PAINTING OF ELECTRICAL POLES, TRIMMING OF TREES/BUSHES AND CONNECTED SERVICES IN ALL POWER HOUSE AT BASISTHA UNDER GE GUWAHATI

Amount

Disconnecting/Taking down old unserviceable Earthing pit of any type with accessories including removing demolished material out side MD land complete all as specified and directed.

Material and labour for earthing complete with GI earth plate 600mm x 600mm x 6.3 mm thick electrode buried directly in ground (earth pit not less then 2.25 metres deep below ground level ) with top edge of the plate not less then 1.5 metres below normal ground level connected to GI earth strip 25 x 4 mm by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No. 3 of MES schedule Part-I and incl 40 mm bore light grade GI protection pipe (upto 7.5 metres beyond outer edge of earth pit) PCC M-10 grade (Nominal Mix) using 40mm graded stone aggregate in pit with 40mm thick RCC cover in reinforced cement concrete M-15 grade (Nominal Mix) using 20mm graded stone aggregate, reinforced with 8mm dia bar both way @ 150mm c/c, watering arrangement with funnel and wire mesh and 20 mm bore light grade GI watering pipe, common salt and chaarcoal filling, necessary excavation and earth work complete. Note : Rate of item is deemed to be included for excavation in hard rock, by compressor machine to achieve required depth.

Material and labour for earthing complete with GI earth plate 600mm x 600mm x 6.3 mm thick electrode buried directly in ground (earth pit not less then 2.25 metres deep below ground level ) with top edge of the plate not less then 1.5 metres below normal ground level connected to GI earth strip 32 x 6 mm by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No. 3 of MES schedule Part-I and incl 40 mm bore light grade GI protection pipe (upto 7.5 metres beyond outer edge of earth pit) PCC M-1+B500 grade (Nominal Mix) using 40mm graded stone aggregate in pit with 40mm thick RCC cover in reinforced cement concrete M-15 grade (Nominal Mix) using 20mm graded stone aggregate, reinforced with 8mm dia bar both way @ 150mm c/c, watering arrangement with funnel and wire mesh and 20 mm bore light grade GI watering pipe, common salt and chaarcoal filling, necessary excavation and earth work complete. Note : Rate of item is deemed to be included for excavation in hard rock, by compressor machine to achieve required depth.

NOTE FOR SL NO 2 & 3 : (i) If the desired earth resistance is not achived 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. (iii) Length of earth strip/electrode beyond 7.5m shall be measured and paid seperately under respective items of this BOQ (iv) Resistance value should be less than 5 ohm.

Material and labour for earthing complete with copper earth plate 900mm x 900mm x 5 mm thick electrode buried directly in ground (earth pit not less then 2.25 metres deep below ground level ) with top edge of the plate not less then 1.5 metres below normal ground level connected to GI earth strip 50 x 6 mm by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No. 3 of MES schedule Part-I and incl 80 mm bore light grade GI protection pipe (upto 7.5 metres beyond outer edge of earth pit) PCC M-1+B500 grade (Nominal Mix) using 40mm graded stone aggregate in pit with 40mm thick RCC cover in reinforced cement concrete M-15 grade (Nominal Mix) using 20mm graded stone aggregate, reinforced with 8mm dia bar both way @ 150mm c/c, watering arrangement with funnel and wire mesh and 20 mm bore light grade GI watering pipe, common salt and chaarcoal filling, necessary excavation and earth work complete. Note : Rate of item is deemed to be included for excavation in hard rock, by compressor machine to achieve required depth.

Material and labour for earthing complete with copper earth plate electrod 600mm x 600mm x 3 mm thick electrode buried directly in ground (earth pit not less then 2.25 metres deep below ground level ) with top edge of the plate not less then 1.5 metres below normal ground level connected to copper earth strip 20 x 3mm by means of briazzing made out of copper steel all as shown in electrical plate No. 3 of MES schedule Part-I and incl 40 mm bore light grade GI protection pipe (upto 7.5 metres beyond outer edge of earth pit) PCC M-10 grade (Nominal Mix) using 40mm graded stone aggregate in pit with 40mm thick RCC cover in reinforced cement concrete M-15 grade (Nominal Mix) using 20mm graded stone aggregate, reinforced with 8mm dia bar both way @ 150mm c/c, watering arrangement with funnel and wire mesh and 20 mm bore light grade GI watering pipe, common salt and chaarcoal filling, necessary excavation and earth work complete. Note : Rate of item is deemed to be included for excavation in hard rock, by compressor machine to achieve required depth.

NOTE FOR SL NO 5 & 6 : (i) 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. (ii) Length of earth strip/electrode beyond 7.5mtr shall be measured and paid under relevent item of this BOQ. (iii) Resistance value shall be less than 1 ohm. (iv) Copper plate shall be of 99.99% copper.

Taking down of unserviceable copper earthing strip any size complete all as directed.

S&F copper strip of size 20mmx3mm thick 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 , complete all as specified and as directed by Engineer-in-charge. Note: Copper strip shall be 99.99% copper.

All as per item No 9.00 here in above but fixing only complete all as directed. Note : Old serviceable copper earthing strip retrieved from serial item No. 8.00 here-in-before shall be used under this item.

Taking down of unserviceable Aluminium earthing strip and any size complete all as directed.

S&F GI steel strip of size 32mmx6mm thick 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 in repair complete all as specified and as directed

S&F Aluminium strip of size 25mmx3mm thick for earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or roof for lightening arrestor on RCC OH Tank upto any height or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc, complete all as specified and as directed

All as per item No 13.00 here in above but fixing only complete all as directed. Note : Old serviceable Aluminium earthing strip retrieved shall be used under this item.

M&L for 32mm bore galvanised iron pipe, light grade including all fittings and fixed laid in trenches or fixed to wall/along the pole for protection of cable including taking down old GI pipe, complete, all as specified and as directed. Note : Excavation & earthwork shall be measured & paid for separately.

S&F Earthing test point terminal block made of gun metal or phosphorus bronze of size 75mmx75mmx25mm thick drilled and screwed including 3Nos, 8mm dia, 25mm 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.

M&L for cutting of existing steel tubing for alteration or additions (each cut measured) of size 50/40mm bore complete, all as specified and directed.

M&L for screwing existing steel tubing for alteration or additions of size 50/40 mm bore complete, all as specified and directed.

S&F Air termination, sigle pointed copper rod 12mm dia and 300mm long (99.9% molecularly copper) with complete acessories fixed on copper strip for earth conductivity to ground as in repair complete all as specified and as directed.

Supply and laying 20mm nominal bore, light grade, galvanised coated steel tube conforming to IS 1239 (Part-1): 2004 including all fittings conforming to IS 1239 (Part-2): 2011 as in trenches complete all as specified and directed. Note : Excavation & earthwork shall be measured & paid for separately under relevant item of this BOQ.

Supply and laying 40mm nominal bore, light grade, galvanised coated steel tube conforming to IS 1239 (Part-1): 2004 including all fittings conforming to IS 1239 (Part-2): 2011 as in trenches complete all as specified and directed. Note : Excavation & earthwork shall be measured & paid for separately under relevant item of this BOQ.

M&L for checking earth resitance value with Digital earth tester of existing earthing pits of equpment/lighting conductor, including replacement of corroded nuts/bolts cleaning of earth pits and checking all connecting and lighting of cconductor and changing of plate as required for obtaining earth value below 5 Ohm and entering the final values in a register complete all as specified and as directed. Note : (i) T&P requried for checking shall be arranged by contractor. (ii) Earth resistance measuring equipment shall submit calibration certificate of mechine.

M&L for checking of existing old earthing pits by earth megar entering the inital values of the earth and lightening conductors and repairs/replacement of Copper strips where found corroded and repairs to pits and testing of earth resistance value and pouring salt/charcol and changing of plate as required for obtaining earth value below 5 ohm and entering the final values in a register complete all as specified and as directed. Note : Copper strip, earth plate, salt & charcoal shall be measured and paid separetly under relevant item of this BOQ.

Supply and replace funnel with mesh for earth pit all as specified and as directed.

Excavating in trenches not exc 1.5m wide and not exc 1.5m in depth for earth pit, laying UG cable, pipe line etc and getting out in soft / loose soil complete all as specified and directed.

Excavating in trenches not exc 1.5m wide and exc 1.5m but not exc 3m in depth for earth pit, laying UG cable, pipe line etc and getting out in hard / dense soil complete all as specified and directed.

Returning, filling, incl spreading levelling, watering and well ramming in layers not exc 25cm all as specified and directed.

Removing excavated material to distance not exc 50m and depositing where as directed at a level not exc 1.5m above the starting point.

M&L for for Earth pit indicator for existing earthing pit made out of 16 mm dia, 60 cm long M S sqaure bar embedded in PCC M-10 grade (nominal mix) using 20mm graded stone agreegate in PCC block of size 30cm x 30cm x 30 cm including C I plate size 30cm x 30cm x 3 mm thick fixed on side wall of PCC block complete all as specified and as directed.

Supply and laying common salt water means pouring it on the earth pits.

M&L for copper brazing of two copper strip of size 20mmX 3mm thick to 32mmx6mm thick/copper rod of 17mm dia fixing on wall with the help of post insulator / fixing on pole with the help of clamp and post insulator complete all as directed.

M&L for PCC M-10 grade (nominal mix) using 40mm graded stone aggregate for earthing pit of outer size 450x450x300mm, wall thickness 10mm and RCC cover in reinforced cement concrete M-15 grade (Nominal Mix) using 20mm graded stone aggregate, reinforced with 8mm dia bar both way @ 150mm c/c of size 450x450x80mm including GI funnel and necessary earth work including taking down old earth pit cover of conventional earthing complete all as specified and as directed.

Material & labour for scrapping, cleaning, including necessay preperation of old steel surfaces of LT Pole of full length including cross arms (outer/inner surfaces) and applying two coats of syntheic enamel paint of approved shade over one coat of red oxide/zinc chrome primer throguh spray machine including writing of Pole No and symbols of LT complete all as specified and as directed.

Material & labour for scrapping, cleaning, including necessay preperation of old steel surfaces LT panel of any size (outer surfaces) and applying two coats of syntheic enamel paint of approved shade over one coat of red oxide/zinc chrome primer complete all as specified and as directed.

Surface dressing not exceeding 30 cm deep including removing the materials to a distance not-exc 60 mtr including cutting vegetation 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 tenderer for single operation only.

M&L for spreading and levelling stone aggregate 63 mm 150 mm average thickness around transformer, two pole/four pole structure including removing of grass and bushes from roots of the area complete all as specified and directed.

Supply and laying dry sand cushioning for spreading and levelling in trenches with fine river sand 9 cm before laying cable and 9 cm deep cover after laying the cable complete all as specified and directed.

Cleaning the area of electric /water supply outdoor/ indoor installations by cutting and removing jungle sturts, roots, bushes plants small trees etc and deposited to n.exc 50 mtr to 100 mtr out side installations complete all as specified and as directed.

Material and Labour for trimming of tree branches (by taking proper shut down from Sub-Station) near LT/HT over head lines upto 3 m clearance around the line on all sides including removing from site all as required and directed. (Note : T&P and ladders will be arranged by the contractor at his own cost)

M/S SEWAK SINGH (BID ID -3463176)

D.B ENTERPRISE (BID ID -3468475)

M/S K NATH AND CO. (BID ID -3468474)