REPAIR REPLACEMENT OF EARTHING INFRASTRUCTURE AND ALLIED INTERNAL WORKS AT ARMY STN UNDER GE AVADI

M&L for earthing complete with copper earth plate electrode of size 60cm x 60cm x 3.15mm thick burried directly in ground vertically at a depth not less than 2.25 metre deep below normal ground level with top edge of the plate not less than 1.5 metre below normal ground level surrounded from all sides by 15 cm thick packed layer of charcoal dust and common salt, filling in alternate layer and electrode connections by using copper strip 20 x 3mm dia by means of bolts, nuts, check nuts and washers made of copper or brass and protected by light grade 15 mm dia GI pipe connected to main switch board or main control board, and GI pipe light grade 20 mm bore for watering and including funnel, wire mesh, RCC pit cover and PCC chamber pit with PCC 1: 2: 4 type C2 including excavation and earth work, disposal of surplus soil to a distance not exc. 50 mtr all as specified and as shown on Plate No 5 of SSR Part I (2009) all as specified and directed by Engr-in-Charge.

Material and labour, test point terminal block made of gun metal or phosphorus bronze or copper, size 75mmx75mmx25mm, drilled and screwed including 3 nos. 8mm dia 25mm long hexagonal head screws, complete all as specified and directed.

Material and labour, Earth continuity conductor or main earthing conductor 32mmx6mm copper strip, fixed to wall on batten with saddles and fixing screws or PVC/ Porcelain insulators etc. or recessed or chases or burried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required, including brazing on both sides (over lapping) at all joints complete all as specified and directed.

Material and labour, Earth continuity conductor or main earthing conductor 25mmx4mm galvanised iron strip, fixed to wall on batten with saddles and fixing screws or PVC/ Porcelain insulators etc. or recessed or chases or burried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required, including brazing on both sides (over lapping) at all joints complete all as specified and directed.

Material and labour for earth continuity conductor or main earthing lead fixed to valve on batten or recess or chases or burried in ground or drawing in conduit or any other situation for loop earthing etc as reqd 4 mm dia galvanized steel wire all as specified and directed by Engr-in-Charge

Material and labour, Air termination, single pointed aluminium rod 12mm dia and 300mm long, including making connection to earthing conductor, fixed as in replacement of old termination rod, complete all as specified and directed.

Supply and fix, GI pipe 25mm bore light grade (ISI marked), cut piece of 1.0 metre - 1.5 metre length or as directed by Engineer-in-Charge, fixed vertically with bottom end embeded in & including cast-insitu PCC (1:2:4) block of size 20cmx20cmx15cm including use and waste necessary fair finish form work, and other end (at top) fixed to air termination rod with necessary bolts, nuts etc as required, complete all as specified and directed.

Supply, Install, testing and commissioning of lighting flash/strike counter in water and weather proof, digital display facility, current discharge capacity > 1 KA, IP 65 protection with enclosure for analyzing the frequency of lightning strikes and effectiveness of the lightning protection system in place and connected to down conductor with mounting arrangements with GI mast tower or Building wall surface and suitable fixing arrangements with standard accessories etc complete as per specification and as required complete all as specified.

Supply and fixing, porcelain supporting insulator of as per existing size/adequate size fixing, on wall/roof for supporting the earthing strips, fixed as in repairs, complete all as specified and directed.

M&L for recharging the earthing of 32mm x 6mm copper strip by providing charcoal dust and earthing salt & including excavating, return filling and test results should be obtained as specified and as directed by Engr-in-Charge