COMPREHENSIVE MAINTENANCE OF EARTH PITS INCLUDING PERIODIC TESTING OF EARTH PITS AND OTHER CONNECTED WORKS, REPAIR/REPLACEMENT OF FLAME PROOF WIRING AND LED TYPE FLAME PROOF LIGHT FITTINGS IN DANGER BUILDING AT WSA AND COMPREHENSIVE MAINTENANCE AND

M&L for earthing of machinery/equipment installed at power house/Sub Stn/ DB complete with galvanised steel earth plate electrode 60 × 60cm × 6mm 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 1.5 metres below normal ground level, connected to existing earth lead strip by means of bolts, nuts, check nuts and washers of brass or HS steel all as shown in electrical plate No. 3 connected to earthing test point and and necessary excavation and earth work PCC (1:2:6) type C-1 with suitable size of CI cover plate with angle iron frame and opening arrangement ) incl providing charcoal or coke and common salt in alternate layer of 15cm compacted thickness all around the earth electrode with funnel and 20mm bore galvanized iron watering pipe (light grade) wire mesh, copper lugs, complete in all respect,including galvanised earth lead wire 4.0mm, 15mm bore (medium grade) galvanized iron pipe up to earthing test point as directed, incl disposal of spoil to a distance not exc 50 mtr and necessary testing on completion including taking out/dismantling of old unserviceable earthing of any description, complete all as specified and as directed. Note :- (i) Earth lead wire/strip beyond 7.5 mtr shall be measured and paid separately. (ii) On testing, after completion, if the earth resistance <2 ohms is not obtained, earthing shall be regenerated at no extra cost till the desired earth resistance is obtained. (iii) Locally available best quality soil to beused all around the earth plate electrode (along periphery of solt, charcole, chemical etc) min covered vol 450 x 450 x 450mm included in unit quoted rate

All as per item No 1.00 here-in- before but using GI earth strip of size 32 x 6mm as earth lead and 40mm boe (medium grade) galvanized iron pipe for protection of earth lead, complete all as specified and directed.

M&L for earthing of equipment at power house/Sub Stn/DB complete with copper earth plate electrode 60 × 60cm × 3.00mm 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 1.5 metres below normal ground level, connected to existing earth lead strip by means of bolts, nuts, check nuts and washers of brass or HS steel in any type of soil, connected to earthing test point and and necessary excavation and earth work, PCC (1:2:6) type C-1 as earth pit with pre-cast RCC (1:2:4) type B-1 cover slab size 400 x 400 x 50mm reinforced with 8mm dia TMT bar, 100mm c/c both ways including one handle made of 12mm dia including providing charcoal or coke and common salt in alternate layer of 15cm compacted thickness all around the earth electrode with funnel and 20mm bore galvanized iron watering pipe (light grade) wire mesh, copper lugs, complete in all respect,including Copper earth strip 20 x 3.00mm, protected by 40mm bore (medium grade) galvanized iron pipe up to earthing test point including disposal of soil to a distance not exc 50 mtr and necessary testing on completion, complete all as specified and directed. Note :- (i) Earth lead strip beyond 7.5 mtr shall be measured and paid separately. (ii) On testing, after completion, if the earth resistance <2 ohms is not obtained, earthing shall be regenerated at no extra cost till the desired earth resistance is obtained. (iii) Locally available best quality soil to beused all around the earth plate electrode (along periphery of solt, charcole, chemical etc) min covered vol 450 x 450 x 450mm included in unit quoted rate

All as per item No 3.00 here-in- before but using magnesium sulphate in lieu of common solt, complete all as specified and directed.

All as per item No 3.00 here-in- before but using copper sulphate in lieu of common solt, complete all as specified and directed.

Supply and installation of maintenance free earthing system comprises of molecularly bonded copper of 99.9% purity on low carbon steel of 3m length, having a diameter of 25 mm with copper coating thickness of 250 microns with fault current withstand capability of 30 KA value of 1 second and peak of 80 KA, tested as per IEC 62561-2, meets the requirement of IS-3043 8 IEC 60364-5-54, tested in CPRI for short circuit with standing capacity, earth conductivity enhancing mineral compound to be used as a backfill compound for earth electrodes; highly conductive in all weather conditions is used for improving the soil conductivity. The material shall be mineral inert to sub soil and shall not pollute the environment and non corrosive to earth rod. The material should have a resistivity less than 0.2 Ohm. It should be free from hazardous substances. The mineral compound is required to have minimum 25 kg of the total composite, universal clamp made of SS 304 for clamping, Polypropylene & polyethylene earth electrod inspection chamber with heavy duty cover should be used to cover the earth rod. The dimension shall be 170mm x 170mm x 190mm with all weight bearing capacity of 50 KN. including provision and laying galvanized steel flat 30 x 3mm thick from earth electrode to test joint directly in ground as required (Hot dip GI strip, Corrosions resistant -cross sectional area of 90 mm square, as per DIN EN 50164-2 (VDE 0185 Part 202) & VDE0185/305, IEC 62305, Zinc coating: 500 g/m square, 70 micron coating including taking out/dismantling of old unserviceable earthing, complete all as specified and directed. Note: Earth result after complete installation should be less than 1 Ohm.

S&F in replacement 32 x 6mm Gl strip in short pieces on surface or in recess for inter connecting, complete all as specified and directed.

All as per item No 7.00 here-in before but copper strip 20 x 3.00mm, complete all as specified and as directed.

All as per item No 7.00 here-in before but copper strip 32 x 6.00mm, complete all as specified and as directed.

All as per item No 7.00 here-in before but galvanised wire 4mm dia, complete all as specified and as directed.