SPECIAL REPAIR REPLACEMENT OF VARIOUS TYPES OF EARTHINGS FOR ELECTRICAL SYSTEM UNDER GE UTILITY AMBALA CANTT

Material and labour for earthing complete with galvanised earth plate electrode 600mm x 600mm, 6.00mm thick surrounded by charcoal and salt, buried directly in ground vertically in a pit of depth not less than 2.25m below ground level with top edge of the earth plate not less than 1.5m below normal ground level, connected to 32x6 mm GI strip earth lead by means of bolts, nuts, checks nut and washers made out of galvanized iron or steel, earth wire protected by galvanized steel pipe 40mm bore (medium grade) and connected to main switch or main control board all as shown in electrical plate No.3 of SSR Part-I & including necessary excavation and earth work. The rate also include charcoal & salt in alternate layers, 20mm bore GI pipe (medium grade) for watering and 40mm bore GI protection pipe, funnel, wire mesh, cast iron cover and frame etc incluing dismantling / taking out of existing earthing & testing on completion complete all as specified and directed. Note : (i) The quoted rate shall include the cost of earth work, GI pipe for watering, GI protection pipe, funnel, wire mesh, RCC cover, etc. complete. RCC cover shall be 50mm thick in 1:2:4 type B-1 using 8mm bars @10cm c/c both way. (ii) The quoted rate shall include the cost of the earth pit covers to be conspicuously marked of plate with stand grouted in PCC. (iii) On testing after completion if the desired earth resistance is more than 2.0 Ώ the earthing will be redone at no extra cost.

All as per Ser Item No. 1.00 here in before but for connected to galvanised earth lead wire of 4.0 mm dia.

All as per Ser Item No. 1.00 here in before but using copper plate 60cm × 60cm, 3.15mm thick electrode and 20×3mm copper strip as earthing lead.

Supply, installation, commissioning and testing of Advance Maintenance Free environment friendly ring earthing system, Each set consisting of 3 Nos of 10 feet length, 17.2 mm dia earth electrode made of high tensile low carbon steel circular rods, molecularly bonded copper on outer surface (minimum copper bonding thickness – 250 microns) with terminals to connect incoming strip in depth 2 feet below the ground with 3 bags (60 Kg per earthing pit) of environment friendly backfill compound Carbon based, Graphite blend and Portland Cement mixed (Approved by Engr-in-Charge) resistivity below 0.15 Ohm meter for high current (for electrical system) as per manufacturing instructions for each 150 x 25 x 6 mm Copper Bar with 4 hole shall be exothermally welded on top to copper bonded rod to make terminal laid in minimum 150mm dia bore. 3 Nos of each hole of 300 mm dia which outer 150 mm dia fill with 100 Kg Bentonite and inner 150 mm dia fill with back fill material. Manufacturer name shall be embossed on rod. 25 x 3 mm copper strip shall be used to interconnect the earths and to make the ring. The earth pit cover polypropylene (250 mm Top x 340 mm Bottom x 250 mm Height) of 2 Kg weight shall be included in the scope of work. Make:- OBO/ ENNOW/ DHRUVA TECHNOLOGIES/ ALFREDKIM SYSTEMS & SOLUTIONS PVT LTD. Note:- (i) Earthing shall be tested after completion of work by contractor in presence of Engr-in-Charge and proper record shall be maintained duly signed by all concerned. On testing if the desired earth resistance of less than 1.0 Ohm is not obtained the earthing will be redone at no extra cost to Govt till desired result obtained. (ii) The copper strip from test point to equipment or entire erathing system to Eqpt/bldg only shall be measured and paid under relevant item. (iii) Government approved certified lab certificate of resistivity of back fill material should be produced at the time of installation. (iv) Exothermically welding of suitable size should be done in all joints.

Material & Labour for test point terminal block made of gun metal of phosphorous bronze of size 75x75x25 mm drilled and screwed including 3 Nos 8 mm dia 25 mm long hexagonal head screw including taking out existing complete all as specified and directed .

Material & Labour for Earth continuity conductor galvanised iron strip 32 x6mm buried in ground or main earthing lead fixed to wall on batten or recess or chasses or buried in ground or drawn in conduit /pipe or fixed to poles or any other indicated situation for loop earthing etc including taking out existing complete all as specified and directed.

All as per Ser Item No. 6.00 here in before but 20 x 3.15 mm copper strip or main earthing lead.

All as per Ser Item No. 6.00 here in before but 4mm dia galvanised iron or steel wire or main earthing lead.

Marking the earthing pit with white /colour hylam sheet /perpex sheet 3 mm thick of size 200x 150 mm fixed with MS angle iron 20x20x4 mm and 0.75 m long including painting with 2 coats of synthetic eneamelled paint over a coat of red oxide primer fixed by means of 2 nos nuts/bolts /washers of suitable size and grouting the marker nearer to the earth pit with PCC 1:2:4 of size 0.15x0.15x0.15 m including necessary earth work ,marker shall be having the following letters (letters of size 25 mm) complete all as specified and directed . EARTH PIT No.:_____ (CHEMICAL/COPPER/GI):_____ EQUIPMENT /BUILDING CONNECTED:__________ DATE OF TEST:______ EARTH RESISTANCE :_______ Ω