REPAIR MAINTENANCE OF CERTAIN EARTHING AND LIGHTENING PROTECTION SYSTEM UNDER AGE I RD KOCHI

Amount

M&L for earthing complete in replacement with galvanized steel earth plate electrode 60cmx60cmx6mm thick buried directly in ground to a depth not less than 2.25m below normal ground level with top edge of earth plate at a depth not less than 1.50m below ground level, earth plate surrounded by 15cm thick packed layer of charcoal and common salt alternatively upto 90cm and connected with and including GI strip of of size 32x6mm by means of bolts, nuts, check nuts and washers and GI pipe 40mm bore light grade for protection of GI strip ,from earth plate to testing point for protection, 20mm bore GI pipe medium grade for water with wire mesh and funnel for watering including necessary excavation and earh work, PCC chamber 1:3:6 type C-2 with RCC cover complete all as shown in electrical plate No. 03 of MES Schedule Part-I, complete all as specified and directed.

Note:- (i) RCC pit cover shall be precast of RCC 1:2:4 type B-1, 80mm thick reinforcement with 8mm TMT steel bar @ 100 c/c in lieu of CI cover and the rate includes in the unit rate of item.(ii) Earth electrodes shall be protected upto test point using necessary arrangement with suitable size GI pipe upto 7.50m and the rate includes in the unit rate of item. (iii) The earth chamber shall be constructed min 3m away from the edge of the bldg pit and the cost of the same is deemed to be included in the rate quoted for this item.(iv) If the earth resistance value turned out to be unsatisfactory upon testing, the contractor has to redo the earthing free of cost.

All as per item No: 1 above but for using copper plate 60× 60cm ×3.15mm thick electrode and 20×3mm copper strip as earthing lead

M&L in repair for GI strip 32x6mm with saddle and fixing screw etc. for down conductors from terminal block/panel board/main DB to earthing pit above ground and underground complete all as specified and as directed.

M&L in repair of copper strips of size 20x3mm from test point/ panel/DB body to earth pit above /underground complete all as specified and as directed.

M & L for painting of Earth pit chamber with cement base paint one coat suitable for outdoor including cleaning of Earth pit surrounding and write earth resistance value and test date on earth pit with green background letters with white paint as specified and as directed

S&F of test links box PVC Surface mounting ,colour coated ,rectangluar shape with 5mm thikness all as specified and directed .

S&F DMC insulators for supporting GI strip and copper strip all as specified and as directed by enrg in charge .

M&L for GI pipe medium grade 40mm with all accessories all as specified and as directed.

ZOOM ENTERPRISES (BID ID -3201466)

ELAN ENGINEERS (BID ID -3210953)

WELTRONENGINEERINGSERVICES (BID ID -3210982)