Provn of 24 x chemical earthing pits for remotely piloted aircraft system at RPAS base Missamari under GE Missamari.

Amount

Supply, installation, testing and commissioning of maintenance free (four Spikes) chemical earthing system using 17.2mm dia, 3000mm long (drawn vertically) high tensile low carbon steel circular rod, molecularly bonded with copper on outer surface (minimum copper bonding thickness of 250 icrons) meeting the requirements of under writers laboratories (UL) 467-2007 or latest with 250mm long copper strips of size (50X3)mm, exothermally welded on top of electrode complete including augering (boring) 100-125mm dia hole as required for electrode in any type of soil and back filling with combination of two chemical compounds (one is earth enchancing chemical compound as per IEEE 80 2000 clause 14.5d, min quantity of compound used 10 Kg and second is earth enchancing back filled compound as per IEEE 80 2000 clause 14.5c, min quantity of compound used 25 Kg), so minimum qty 35 Kg per electrode, However extra chemical is required to fill the hole around the rod, same shall be arranged by the contractor at his own cost and cost of the same is deem to be included in the unit rate of this item) conforming to IEEE/BS standards incl HDPE pit cover light weight made out of high quality polymer with lid made of HDG steel and U-clamp copper nut & blot & gun metal body 1 No. per electrode required for joining all four electrodes complete all as specified and as directed. Note :- (i) The work of earthing shall be carried out by authorised trained rep of OEM. (ii) The acceptable earth resistance at earth busbar/test point shall be as per users requirement as desired by Engr-in-Charge but it should be below 01 Ohm. (iii) The procedure mentioned here-in-before for one earth pit shall be repeated for other earth pits. (iv) Copper strip 20 X 3.0 mm required for joining these four electrodes in loop shall be measured and paid seperately. (v) The distance between two successive earth electrodes shall not be less than 3 metres. (vi) The rate quoted shall also be included the following elements :- (a) Complete earthwork including drilling holes for electrode. (b) Earthing electrode-04 only (c) Backfilling carbon based ground enhancing compound (GEC). (d) Pit cover light weight made out of high quality polymer with lid made of HDG steel. (e) Copper strip as earthing lead of size 50mmx3mm, 250 mm long only, beyond 250 mm, other size shall be measured and paid for separately under respective item here-in-after. (f) All labour and T&P required including testing of earth network. (vii) Testing of earth resistance shall be carried out in presence of JE and Engr-in-charge. (viii) Original purchase vouchers for copper rod and back fill compound and manufacturer test certificate of entire quantity shall be produced by the contractor before commencement on ground.

M&L copper strip with saddles/insulators for main earthing lead from test point equipements and fixed with wall/recess/chases or buried in ground or any indicated position of size 20 x 3 mm including brazing of joints complete all as specified and directed. ( Note :- Earth work and excavation shall be measured and paid separately.

S & F 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.

S & F GI pipe of 40 mm dia, ISI marked, light grade to cover the copper strip (20mm x 3mm), complete all as specified and as directed.

Skyline Encon

M/S S.S.Corporation