REJUVENATION OF EARTHING PITS FOR L2 SWITCHES AND LIGHTING CONDUCTION PROVIDED AT HQ MC BLDG AT AF STN NAGPUR

Note : (a) Contractor will provide test sheet duly signed by the Engr-in-charge on completion of earthing. (b) Copper strip beyond test point shall be measured and paid separately. (b) Contractor shall give guarantee of minimum 24 Months for the earting carried out by him (c) The rate quoted is inclusive of test point made of phosphorous bronze of size 75x75x25mm, drilled and screwed including 3 Nos 8mm dia 25mm long brass nuts and bolts complete all as directed. (d) Any other fittings /fixtures if technically required for archieving desired results (if not included above) shall be provided by contractor without any extra cost to the Govt. (e) On testing after completion if the desired resistenance i.e below 1 Ohm is not obtained the contractor shall redo the earthing without any extra cost of department. (f) Protection pipe upto equipment (if required) shall be deemed included in the unit rate for earthing. (g) Copper strip upto 7.5 RM shall be deemed included in the unit rate for earthing all as specified and as directed. (h) Earth pit to be inspected by the contractor or his rep on monthly basis in presence of one rep of AFNET power plant without any extra cost of department.. (j) Before excution of work Soil resistivity test, Fall of potential (3 Point) method, Thermal resistivity soil moisture test should be mandatary to carried out through Govt institute (Polytechnic) (NABL approved) and report to be submitted to Engr in charge (if the desire report not obtained from the soil the same replaced accordingly for better result of earthing. (k) Each Electrode Measured by Gauge measure M1 Type Micron is not less than 250 Micron.

S&F Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles for loop earthing as required 25 x 3mm copper strip alongwith Purity test by Gun Method is not Less than cu 99.54,Iron 0.073,Zinc 0.387 and further connected to test point terminal alongwith earthing strip epoxy type insulator and must be supported at every 2.00 mtrs in intervals complete all as specified and directed .

Note : The amount against Schedule of Credit on Page No. 22 shall be deducted from the total amount quoted against Sch 'A' while deriving Acceptance