Refurbishing of existing plate earthing system with Earth-mat in lower yard at 110 kV Substation Koppam

C-202526-3027-4 Hand picking, collecting and stacking the 40mm metal spread in the switch yard at a convenient place in heaps for measurements as per direction of department officers at site.(Up to 50m)

TRS.01.094 Cutting 32mm MS rod in required length etc complete as per the direction of the departmental officers.

TRS.01.097 Bending 32mm MS rod for crossing cable trench/foundations/risers etc.

TRS.01.100 Laying of earth mat of required size as specified using 40/32/25mm MS rod including levelling lowering and placing in trenches, complete as per the direction of departmental officers.

TRS.01.103 Drilling bore holes of sizes 150mm or nearest in all classes of soil including hire charges of plant and machinery, cost of oil, fuel, tool etc. and taking all necessary precautions for safety to the substation equipments etc. as per the direction of departmental officers at site.

TRS.01.101 Driving down the ground electrode upto a depth of 3m from the already taken earth pit as directed by the departmental officers.

TRS.01.104 Welding of overlapping joints for mat,riser lap joints with 32/25mm MS rod placed in trenches, having 150mm in length 6mm in thick on both sides of the rod and both ends of overlapped MS rods with 6mm welding thickness after cleaning the surfaces neatly. Charges includes cost of low hydrogen DC electrode (No. E7018), hire charges of DC arc welding set and tools and plants required, current charges including labour charges for holding MS rod in position and applying two coats of anti corrosive paints at the welded joints etc. complete as per the directions of department officers.

TRS.01.105 Welding the nodal points (cross joints ) in the trenches at two sides to a thickness of 6mm after cleaning the surface neatly. Charges includes cost of low hydrogen DC electrodes (No. E7018), hire charges of DC welding set and tools and plants required, current charges, labour charges for holding MS rod in position and applying two coats of anti corrosive paints at the welded joints etc. complete as per the directions of departmental officers.

TRS.01.106 Welding the ground electrode with the main electrode , after cleaning the surface neatly. Charges includes cost of low hydrogen content DC electrodes (No. E7018), hire charges of DC arc welding set, tools and plants, current charges, labour charges for holding MS rod in position and applying two coats of anti corrosive paints at the welded joints etc. complete as per the directions of departmental officers.

2.25 : Filling available excavated earth (excluding rock) in trenches, plinth, sides of foundations etc. in layers not exceeding 20 cm in depth, consolidating each deposited layer by ramming and watering, lead up to 50 m and lift up to 1.5 m.Filling available excavated earth (excluding rock) in trenches, plinth, sides of foundation etc. in layers not exceeding 20 cm in depth, consolidating each deposited layer by ramming and watering, lead up to 50 m and lift up to 1.5 m.