REPAIR/REPLACEMENT OF LIGHTENING PROTECTION SYSTEM ALONG WITH EARTHING AND MISCELLANEOUS E/M WORKS AT VARIOUS LOCATIONS UNDER AGE(I) LANSDOWNE

Taking down old unserviceable strip of any size any material complete all as specified and as directed.

S&F in repair/replacement aluminium strip of size 25 x3.15 mm with saddles and fixing screws etc for roof conductors and down conductors above ground. (Gap of the saddles is one metre distance) complete all as specified and directed.

S&F in repair/replacement GI strip of size 32x6 mm with saddles and fixing screws etc for roof conductors and down conductors above and below ground. (Gap of the saddles is one metre distance) complete all as specified and directed.

S&F in repair/replacement Copper strip of size 20x3.15 mm with saddles and fixing screws etc for roof conductors and down conductors above the ground. (Gap of the saddles is one metre distance) complete all as specified and directed.

S&F in repair/replacement Copper strip of size 32 x 6 mm with saddles and fixing screws etc for roof conductors and down conductors burried in ground. (Gap of the saddles is one metre distance) complete all as specified and directed.

Material & labour in replacement for earthing complete with galvanised steel earth plate electrode 600x600x6mm thick burried directly in ground. ( earth pit not less than 2.25 mtr depth below ground level) with top edge of the earth plate not less than 1.5mtr below normal ground level surrounded with adequate quantity of charcoal dust mixed with salt to a packed thickness of 15cm all around the plate.connected by 32x6mm GI strip as earth strip as earth lead by means of brass nuts and bolt, thimbles check nuts, washers including concrete chamber of PCC 1:3:6 type C-1 using 20mm graded stone aggregate with fair finish, internal surface of concrete chamber shall be given internal dia 300mm x300mm, 15mm thick plaster in CM 1:4 funnel with wire mesh, RCC pit cover of 320x320x80mm size (1:2:4) Type B1 using 20mm graded stone aggregate rainforced with XPM all as shown in electrical plate No 3 of MES SSR Part-1(2009) and specified including and provision of GI strip upto 7.5 mtrs long with 40 mm dia light grade GI pipe protection and watering pipe of GI 20 mm bore, medium grade, including all exavation and earth work and connecting the earthing strip to panel, including testing on completion complete all as specified and directed by Engr-in-charge. Note:- (i) RCC pit cover shall be precast of RCC(1:2:4) type B1, 80mm thick rainforced with XPM weighing not less than 4kg/sqm in lieu of CI cover. (ii) Cost of additional GI strip more than 7.5 mtrs will be measured and paid seperately under relevant items.

Material & labour in replacement earthing complete with copper plate 60 x 60 cm x 3.15 mm thick electrode and 20 x 3 mm copper strip as earthing lead buried directly in ground incl earth pit (earth pit not less than 2.25 mtr deep below ground level) with top edge of the plate not less than 1.5 mtr below normal ground level, connected to copper earth lead 20x3mm mm dia by means of bolts, nuts, check nuts and washers of coppered iron or steel all as shown in Electrical plate No 3 connected to earthing test point all as specified or indicated including testing on completion.

Material & labour in replacement for maintenance free chemical earthing complete with copper solid rod 10 feet length, 17.2 mm dia, made of copper bonded grounding rod (250+ microns) is a high-tensile, low-carbon steel rod molecularly bonded with 99.9% pure copper, complies with Underwriters Laboratories (UL 467) standards, with exothermally jointed exothermic jointed Copper plate of 90 cm x 60 cmx5mm for connection The rod and exothermic joint together successfuly tested at 25KA fault current by CPRI, filling around the electrode with minimum 50 kg ecofriendiy earth enhancing compound (bentonite/graphite based conductive compound) having low resistivity with each earth rod comply to EC62561 The earth electrode shall be installed by boring a hole of approx 125 mm dia up to a depth of 4.5 mtr below ground level top edge of earth rod at a depth not less than 1.5 metre below normal ground level or as per manufacturers instruction, electrode connections by using earth continuty copper strip 32x6 mm (upto test point from top of rod, ie. 7.5m min) by means of brass bolts/nuts/washers drawn thraugh and including protected by 50mm dia GI light grade protection pipe from earth plate to test point, including excavation and earth Work, complete with HDPE/PVC earth pit chamber with FRP cover of sutable size, installation, commissioning and testing complete all as specified and as directed.

M&L Cement concrete type C1, 1:3:6 (using 20 mm graded stone aggregate) in fdn filling and mass concrete complete all as specified and directed.

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