REPAIRS / REPLACEMENT OF EXISTING EARTHING, LIGHTENING ARRESTER AND ASSOCIATED MISC WORK AT AF STN SURYALANKA

Amount

S&F in repair earth continuity conductor or main earth lead fixed to wall or buried in ground or drawn in conduit pipe or any other indicated situation as required of GI wire of size 4mm dia with necessary saddles complete all as specified and as directed.

M&L in replacement of Earthing complete with GI Earth Plate electrode 600x600x6mm buried directly in ground earth pit not less than 2.25 mtr below ground level with top edge of the plate not less than 1.5 mtr below ground level, surrounded from all sides with mixture of charcoal and common salt and electrode connected with GI earth lead GI earth strip of resize 32x6 mm by means of nuts/bolts/ check nuts/ washers , GI pipe light grade of 40 mm bore as protection pipe, GI Strip of length not more than 7.5 mtr and connected to test point. GI pipe 20mm dia medium grade for watering, funnel with wire mesh, PCC pit and RCC (1:2:4) type B-1 for cover with 8 mm dia bar reinforcement both ways @ 140 c/c including excavation and earth work disposal of surplus soil to a distance not exceeding 50 mtr as shown on electrical plate No 3 of SSR-2009 complete all as specified and as directed.

All as per item No 2 but using copper plate 600×600×3.15mm thick electrode and 20×3mm copper strip as earthing lead

S&F in repair air termination single pointed aluminum rod 12mm dia 300mm long fixed on PCC Block and connected to aluminum strip with nuts/ bolts and washers complete all as specified and as directed.

S&F in repair earth continuity conductor fixed to wall or batten or recess or cheses or buried in ground or drawn in conduit pipe or fixed to poles or any other indicated situation as required of size 25 x 3 mm aluminium strip on necessary insulators for every 1 mtr complete all as specified and as directed.

All as per item No 05 but copper strip of size 20 x 3 mm with necessary suitable sleeve. Note: Copper strip to be connected by copper braising, rate is deemed to be include braising work

M&L in repair for porcelain/ Bakelite insulator for supporting the aluminum/copper strip of any size, fixed to wall/ floor with two screws and fixing cooper / aluminum strip with one washer and nuts complete all as specified and as directed.

M&L for Removing of old rusted nuts, bolts, washers, replacing with new GI nuts, bolts, 2 Nos washers for GI/Aluminium strip of size not more than 32 x 6 mm complete all as specified and as directed.

M&L in repair for earth plate marking made up of angle iron 25x25x3 of length not less than 1.0 mtr, (0.5 mtr above GL) fixed with MS plate of 2 mm thick, 300 x 150 mm by welding, with two coats of red oxide paint with one coat of anti corrosive paint of specified colour and written "Earth Pit Nos XX, ER Value :_______, Measured on:________, Next Due on:_______" and fixed complete all as specified and as directed.

S & F in replacement of Test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 nos. 8mm dia 25mm long hex. head screw complete all as specified and directed.

Excavation of pit upto 1 mt depth & pouring salt 25 Kg, Charcoal 25 Kg & magnesium sulphate 25 Kg including returning filling complete all as specified and as directed.

Supplying, laying, jointing and testing galvanized iron steel water tubing 15 mm bore, medium grade, laid in trenches, including all fittings and fixtures complete all as specified and as directed.

S&F in repairs 15 mm synthetic bib cocks complete all as specified and as directed.

S&F 32 mm medium grade PVC pipe ISI marked, to be buried the earthing strip into the ground for popper insulation of building and equipment complete all as specified and as directed.

M&L for Brazing of size 40mmx25mmx5mm in copper strip of size 25x3mm at the joint of strip through copper rod of proper size and combination of oxygen acetylene gas cylinder.Joint must be able to withstand high tensile strength and properly done without any defect or without any crack complete all as specified and as directed. Note :- (1) If any crack found in the brazing contractor will do brazing free of cost again.

Excavation of earth pit upto one feet depth and one feet radious around the earth electrode and supply and pour the Earthing Gel (Earth recharger), an earth resistance lowering Gel, 6 kg in bucket after mixing the gel with 10 ltrs of water, pouring the gel slowly with in a period of 2 hours and all as per instructions issued by manufacturer including recording the earth resistance of the earth pit before and 4 hours after pouring the Gel complete all as specified and directed. (Note :- (i) Rates are inclusive of GST, packing and freight, installation, testing and commissioning charges.)

Removing and re-fixing in repair Aluminium strip 25 x 3.15mm with saddles and fixing screws etc. for roof conductors and down conductors above ground complete all as specified and as directed.

Bismi Engineering

G V N R CONSTRUCTIONS

Ruchira Associates