SPECIAL REPAIR REPLACEMENT OF OLD UNSERVICEABLE EARTHING AT TECH AREA AT 11 BRD AF STN OJHAR

Supply, install , testing and commissioning maintence free earth pit using 76 mm Nominal Bore 99.99 % Pure Copper Pipe of 3 meter length as per IS 1239 , 15 Kg. Terec+ Ground Enhancing compound tested with Central Power Research Institute, Bangalore for'Long Term stability' of 2 years , 37.5 Kg. Earthcon Backfill compound along with 450x450 mm chamber work in set of 4 earthing Pit grided to acheive resisitanec of less than 1 Ohm. Note :-(1). Contractor will executed the work as per soil resistivity reports given by same OEM. However to achieve the result less than 1 Ohm gridding of earth pit should not exceed 4 Nos of earth pits. (2). To achieve results less than 1 ohm contractor will provide gridding of earth pits as per soil resistivity test report ( but not more than 4 earth pit). Artificial treatment of 12.5 Kg earthon compound per 2 meter as per drawing attached for understanding the scheme and work execution and excavation and chemical required in area of gridding shall be included in rates quoted by contractor. (3) copper strip required for inter connection of gridding of earth pit shall be paid separtely. (4). Total 16 nos of earth pits of above specification to be executed at site. However gridding will be decided as per requirement of earth result and as soil resistivity report. (5) Copper strip of gridding shall be placed under ground level with the depth of 400 to 600 mm with the treatment of earthcon complound and alluvial soil as drawing.(6). removal of grabbles and stone and add some quantity of earth enhancement material in the soil using a black fill compound and make layer of Black Soil / garden soil/ alluvial soil, terrace, compound and earthcon compound repeat tye same procedure around the 76 mm electrode pipe as per drawing. .

Material and labour for Artifitial treatment using 24 Bags of 12.5 Kg. Earthcon backfill compound on 24 meter of 50x6 mm Copper grid to connect 4 numbers of earth pits. The Grid shall be lay 600 mm deep from ground level.

Material and labour for test point terminal block insulated from wall or external surface made of gun metal or phosphorus bronze of size 75x75x25 mm drilled and screwed including 3 Nos 8 mm dia 25 mm long hex head screws complete fixed on ebonite sheet 6mm thick fitted on MS flat 50x5mm bent to shape etc complete all as specified and as directed.

Material and labour for Air termination, single pointed aluminium rod 12 mm dia and 300 mm long duly fixed on 150X150X200 mm height PCC height PCC casting block or fixed on CRCA sheet with suitable insulated material /ahesive tape etc as required at site .Note_ ii) The quoted rates shall be deemed to be included with cost of insulated material /ahesive tape and PCC block.

Supply & Fix 25 x 3.15 mm aluminium strip ( Roof conductor or down conductor) above ground level fixed to wall/ roof duly insulated fixed on and including new porcelain insulators with clamping device or recessed or chases or burried in ground/ floor or drawn in conduit / pipe or fixed to poles or any other indicated situation or for loop earthing etc. Note :- i) The consecutive distance between porcelain insulator will not be more than 50 cm. ii) The quoted rates shall be deemed to be included with cost of porcelain insulator of suitable size (iii) T&P as reqd and labour required to work on roof top and at lateral faces of existing hangers/bldgs upto height of 25 Mtrs.

Material and labour for PCC block on roof top comprising 1:3:6 of required size at places where directed & laying,clamping the strip any size secured on the block with suitable size GI bolt duly grouted, nut bolt washer etc.

Supply only Salt

Supply only Char coal

Supply only Magnesium sulphate