SPL REPAIR REPLACEMENT OF EARTHING AND CONNECTED WORKS AT AFS TAMBARAM

M&L for Earthing complete with Copper earth plate 600 x 600 x 3.15 mm thick buried directly in ground (earth pit not less that 2.25mtr deep below ground level ) with top edge of the plate not less than 1.5mr below normal ground level connected to 20x3 mm Cu strip as earthing lead by means of brazing after tighten by bolts, nuts, check nuts and washers from earth pit to test point with protection GI pipe of size 50mm dia light grade and providing masonry enclosure including watering GI pipe (medium grade) 20 mm bore from bottom of earth pit to top of electrode and 20 mm GI pipe light grade for earth strip protection complete with earth pit pit covers of 300mmx 300 mm made of cast iron including painting as per color coding as per IS,in PCC 1:2:4 type B0 using 12 mm graded crushed stone aggregate, RCC cover, funnel, wire mesh including necessary excavation and earth work in any type of soil, returning filling in and removal of surplus soil complete all as specified, complete all as specified and directed by Engineer-in-Charge. Note: (i) Copper strip excluded in the quoted rate from earth pit to test point (ii) Contractor should ensure that result of each earthing is less than 1 Ohm and in case soil is not suitable for the same is to be placed suitable clay soil to bring the desired result.. (iii) On testing after completion if the desired resistance is not obtained the contractor shall redo the earthing without any extra cost to department. (iv) Work excluded brazing work for earth strip. (v) Work excluded brazing of Cu strip to copper earth electrode

M&L for Earthing complete with GI earth plate 600 x 600 x 6 mm thick buried directly in ground (earth pit not less that 2.25mtr deep below ground level ) with top edge of the plate not less than 1.5 m below normal ground level connected to 25x5 mm GI strip as earthing lead by means of brazing after tighten by bolts, nuts, check nuts and washers from earth pit to test point with protection GI pipe of size 50mm dia light grade and providing masonry enclosure including watering GI pipe (medium grade) 20 mm bore from bottom of earth pit to top of electrode and 20 mm GI pipe light grade for earth strip protection complete with earth pit in PCC 1:2:4 type B0 using 12 mm graded crushed stone aggregate, RCC cover, funnel, wire mesh including necessary excavation and earth work in any type of soil, returning filling in and removal of surplus soil complete all as specified and directed by Engineer-in-Charge. Note: GI strip 3 mtr included in the quoted rate from earth pit to test point.

M&L for brazing in repair work for GI strip not exceeding 3.2 cm in length and not exceeding 6 mm in thickness complete all as specified and directed by Engineer-in-Charge.

M&L for brazing in repair work for copper strip not exceeding 3.2 cm in length and not exceeding 6 mm in thickness complete all as specified and directed by Engineer-in-Charge.

S&F aluminium strip 25x3.15 mm with saddles/insulators, complete with fixing screws for roof/down conductors/main earthing lead, including bracing/jointing and nut bolts jointing at all joints complete all as specified and directed by Engineer-in-Charge.

Supply and fixing 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 or any other indicated situation for loop earthing etc. as required of size 25X3 mm copper strip with welding/brazing of four sides of lapping, provision of PVC/porceilin insulators not exceeding 250mm spacing , nut bolts and washers wherever required complete all as specified and directed by Engineer-in-Charge.

M&L Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in pipe or fixed to poles or any other indicated situation porcelain insulator saddle not exceeding 250mm spacing as required of size 25x5 mm galvanised iron strip complete all as specified and directed by Engineer-in-Charge.

Taking out aluminium/copper/GI strips any size complete all as specified and directed by Engineer-in-Charge.

M&L for Test point terminal block for earthing made of gun metal or phosphorus bronze size 75x75x25mm driled and srewed including 3 nos 8mm dia 25mm long hex head srew,complete all as specified and directed by Engineer-in-Charge.

Supply and installation of advance maintenance free Earthing System by boring the required three nos of holes in semi hard soil or hard soil consisting of 01 Nos UL-467 listed and CPRI tested copper high tensile low carbon steel coreelectrode rod of 17.2 mm dia with a minimum coating thickness of 250 microns and length of 3 mtrs tested according IEC 62561-2 with min 10 years life span(the rod should be marked as per the UL certification) incl min 25 kgs/electrode of earth enhancing compound (PROCEM) NABL certified CPRI tested ecofriendly tested as per the IEC 62561-Z and needs to be considered to fill the 100 mm bored hole surrouning to the electrode..The Copper tube earth electrode should be of outer dia 50 mm,thickness of rod 01mm and length 03 mtrs tested according to IEC 62561-2 with minimum 5 years life span (the rod should be marked as per the UL certification ) including min 25 Kgs/electrode of earth enhancing compound (PROCEM) NABL certified, CPRI tested eco friendely tested as per the IEC 62561-7 and needs to be considered to fill the 100 mm bored hole surrounding to the electrode. the earth enhancing compound should have restivity less than 50 ohm-meter with chemically inert to sub soil that should not pollute the envoriment and non corrisiovie to the earth electrode itself. Provision of the connector for connecting electrode with earthing conductor/strip including fastner made of stainless steel/copper/brass as directed having suitable size according to the electrode and earthing conductor dimensions. all the three earthing electrode would be seperated by appropriate distance of not less than 3m and not more than 6m and connected to Each other by and including 25X3mm copper strip to make ring earth and further to be connected to the testpoint and to be buried in appropriate depth not less than 500 mm below the normal ground level and earth pit chamber of suitable size not less than 300mmX3000mmX300mm internal dimension made of FRP material complete with flush mounted, removable and locakable cover able to withstand 15kN for Each earth electrode all as directed by engineer in charge.The interconnecting conductor/copper strip shall also be covered with approximately 30 kg of earth enhancing compound for each 3 metres length of strips all to be included in quoted rate itself. The Earth pit inspection chamber should be as per IEC 62561-5 or latest and will be of 300x300x300 mm inside dimension of RCC with 50 mm thick and fine finish.The marking space should be present on RCC Cover complete all as specified and directed by Engineer-in-Charge.