Repair to earthing, lighting protection in domestic area and tech area at AF Stn Nal under GE (AF) Nal

Amount

Supply and fixing as in repairs Air termination, single pointed, aluminium rod 12mm dia and 300mm long bolted to aluminium strip 25mm x 3mm including nuts, bolts and washers complete all as specified and directed.

S&F 20x3mm copper strip as 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 through wall /floor / roof or fixed to poles or any other indicated situation for loop earthing etc. as required complete all as specified and directed. Note:- (i) Excavation & earth work shall be measured and paid for separately. (ii) Cutting holes in the wall and making good with cement plaster / mortar alongwith distemper / white wash is deemed to be included in the rate quoted. (iii) Cost of Insulators required for fixing of strip including nuts and bolts is also included in the unit rate quoted)

All as per description of serial item No. 2.00 here in before but aluminium strip of size 25mm x 3mm

All as per description of serial item No. 2.00 here in before but galvanised iron strip of size 32mm x 6mm

All as per description of serial item No. 2.00 here in before but galvanised iron strip of size 25mm x 4mm

S&F as in repairs epoxy based insulator 40mm height for fixing GI strip on wall / ceiling / floor / poles etc. complete all as specified and directed. Note:- This item is considered for replacement of insulators other than those catered for unit rate of serial item No. 2 here-in-before.

S&F as in repairs HDPE pipe medium grade external dia 40mm, exclusive of boxes (junction / terminal) but inclusive of all tees, bends, elbows, reducers, bell mouth tube ends and fixing accessories such as couplers, lock nuts, saddles, pipe hooks etc. complete all as specified and directed.

S&F as in repairs galvanised steel tubes 40mm bore light grade with all fittings, laid in trenches / fixed to walls/poles with suitable clamps, nuts, bolts etc for passing of earth continuity conductor including necessary welding where required complete all as specified and directed.

S&F as in repairs galvanised steel tubes 20mm bore light grade with all fittings, laid in trenches / fixed to walls/poles with suitable clamps, nuts, bolts etc for watering arrangement complete all as specified and directed.

S&F as in repairs galvanised steel tubes 15mm bore medium grade with all fittings, laid in trenches / fixed to walls/poles with suitable clamps, nuts, bolts etc for complete all as specified and directed.

S&F as in repairs Bib tap standard of PTMT any colour high pressure screwed for iron pipe and fixed (Minimum weight 90gms) complete all as specified and directed.

Taking down / out existing copper / GI strip as earth continuity conductor fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles etc, incl straightening the twisted / bent up portion of strip and re-fixing in position complete all as specified and directed. Note:- Welding / soldering of earth continuity conductor where required shall be measured and paid for separately.

M&L as in repairs earthing complete with galvanised earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly in ground in vertical position, earth pit not less than 3.00 Mtr deep below ground level with top edge of the plate not less than 2.25 Mtr below ground level connetced with galvanised iron earthing strip of size 20 mm x 3 mm by means of nuts, bolts, check nuts and washers made of galvanised iron or steel earthing lead protected by galvanised iron pipe 40 mm bore (medium grade) and other end connected to earthing test point or lightening arrestor or main controlling switch as directed including providing funnel with 20mm bore galvanised iron pipe (light grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) all round the earth electrode, concrete earth pit in PCC (1:3:6) type C-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:2:4) cover slab (re-inforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) including necessary excavation & earth work, returning filling and removal of surplus earth upto a distance not exceeding 50 Mtr etc all as shown on electrical plate No. 3 of MES Schedule Part-I complete to obtain less than 1 Ohm earth resistance, complete all as specified. NOTE : (i) Cost of this items includes the scope of earth work, charcoal, salt, PCC, RCC pit cover of required size. (ii) Unit rate of this items includes the cost of galvanised iron strip upto 7.5 metre. After 7.5 metre, strip shall be measured and paid for separately. (iii) Suitable porcilain insulator with a gap of 30cm with Bronze test point of MES pattern shall also be deemed included in the quoted rate

M&L as in repairs earthing complete with copper earth plate electrode 600 mm x 600 mm x 3.15 mm thick, burried directly in ground in vertical position, earth pit not less than 3.65 Mtr deep below ground level with top edge of the plate not less than 2.90 Mtr below ground level. The earth plate to be connetced with copper earthing strip of size 32mmx6mm thick by means of brazing between copper strip and earth plate min 45 cm in vertical length and copper strip also to be joined by brazing only. The copper earthing strip to be protected by galvanised iron pipe 40 mm bore (medium grade) up to ground level and there after with 40mm dia HDPE pipe up to test point. Earthing shall include provision of funnel with 20mm bore galvanised iron pipe (light grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) up to 90 cm all around earth plate further filled with 60 cm thick Tibba sand and 2nd layer with 30 cm of Magnesium sulphate powder (compact thickness ), 3rd layer with tibba sand up to ground level. Earthing shall also include concrete earth pit in PCC (1:3:6) type C-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:2:4) cover slab (re-inforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) including necessary earth work in excavation, returning filling and removal of surplus earth upto a distance not exceeding 50 Mtr etc all as shown on electrical plate No. 3 of MES Schedule Part-I complete to obtain less than 2 Ohm earth resistance value, complete all as specified. NOTE : (i) Cost of this items includes the scope of earth work, charcoal, salt, PCC, RCC pit cover of required size. (ii) Tibba sand shall be arranged by the contractor at his own and the cost thereof shall be deemed included in unit quoted rate of this item. (ii) Electrical Plate No. 3 refrred in the item above is mainly for earth chamber.

Supply and fixing as in repairs PVC insulated multistranded copper conductor cable 10 sqmm single core 1100 volts grade including copper lugs/thimbles on both side fixed from common Earth point to neutral point at main switch / earth dolly including nuts, bolts, washers complete all as specified and directed.

M&L brazing of copper earth continuity conductor 32mmx6mm / 25mmx3mm including cleaning the conductor and replacement of nuts, bolts for better earthing and connectivety and fixing at its original position complete all as specified. Note: Contractor shall make arrangements of gas cylinder and T&P for brazing and cost is deemed to be included in the unit rate.

Material and labour for maintenance of coper earthing by pouring water on twice a week basis and adding salt solution on required intervals to maintain earth resistance less than 1 Ohm for a period of 07 months complete, submitting individual earth resitance results on 1st of every month, carrying out earth test of individual earth as and when demanded by MES with in 08 hours and rectifying the defects within 24 hours if found earth resistance more than 1 Ohm, all as specified and directed. NOTE : (i) Testing of earthing will be done by 3 Pole Fall of potential method. (ii) Cost of tools and materilas required to perform the test is demed to be included in the rate quoted. (iii) Contractor will arrange water bowser for watering at his own end. (iv) Water shall be issued for filling from MES Pump House. (v) This item will not be operated in Monsoon period. (vi) Funnel, bucket for pouring of water shall be arranged by the contractor at his own soure. (vii) Each earth shall be tested on monthly basis. (viii) Particular earthing shall be maintained for a period of 7 months as per above description and while making payment on completion of 7 months. The whole process shall be considered as composite one unit for the particular earthing. (ix) Cost of Common salt is included in the unit quoted rate of this item. (x) Contractor may claim the running payments but rate against this item is for a period of 7 months, accordingly same shall be worked out proportionally based on the total period of maintenance carried out.

Supply and laying common salt in earthing pits filled around earthing electrodes complete all as specified and directed. Note:- (i) Excavation and earthwork shall be measured and paid for separaetly. (ii) This item shall be not be operated for earthings considered against item No. 17 here in before.

Supply and laying charcoal dust / breeze suitable for earthing complete all as specified and directed. Note:- (i) Excavation and earthwork shall be measured and paid for separaetly. (ii) This item shall be not be operated for earthings considered against item No. 17 here in before.

Excavation in trenches in soft/loose soil not exceeding 1.5 mtr wide and not exceeding 1.5 Mtr deep and getting out, forming bottom surfaces to required gradient complete all as specified and directed.

Returning, filling in trenches including spreading leveling watering and well ramming in layers n.exc 25 cm thick complete all as specified and directed.

Removal of surplus soil to a distance not exc. 50 metre and depositing where directed at a level not exc. 1.50mtr above the starting point complete all as specified and directed.

Testing of existing seriviceable earthing located at diffierent locations after disconnecting from test point by using suitable earth tester, measuring the earth values in ohms and writing the values on earth chamber ln bold white colour letters not exc 2cm height on the black back ground such as tested on, due date of testing eg-EP No-01, ER-1.0 Ohms & Date of testing : DD/MM/YYYY and recording of test results in prescribed format all as directed by Engr-in-Charge. Note:- (i) the test results shall be kept on record duly signed by contractor, JE/EM and user concerned. (ii) This item shall be not be operated for earthings considered against item No. 17 here in before.

M&L as in repairs earth pit chamber, size 300mm x 300 mm (internal dimensions) and wall thickness 120mm with PCC 1:3:6 type C-1 using 20mm graded stone aggregates including RCC cover 50mm thick in cement concrete 1:2:4 type B-1 reinforced with 6 mm dia MS round bars @ 15 cm c/c both ways complete all as specified and directed.

S&F as in repairs precast RCC earth pit cover, size 540mm x 540mm x 50mm in cement concrete 1:2:4 type B-1 duly reinforced with 6 mm dia MS round bars @ 15 cm c/c both ways including handle complete all as directed.

M&L painting earthing chambers with two coats of synthetic enamel paint in red / yellow colour and writing ln bold black colour letters 1.5cm height 'Chem Pit-1, Conventional Pit-5' complete all as specified and directed.

M/s Chopra Associates

M/s Rohit Construction Co.

Beenu Co. Company

national engineering

MAHAVIR CONSTRUCTION CO