SPECIAL REPAIRS TO CERTAIN EARTHING INFRASTRUCTURE AT KUMBHIRGRAM (3RD CALL)

Amount

SCHEDULE 'A' PART-I (B/R PORTION)

Supply, installation and testing of waterless and maintenance free Earth (grounding) Electrodes of overall size Dia 85 mm x Length 3000 mm with copper bonded MS round rod, size Dia 17.2 mm x Length 3000 mm (02 Nos). Earth electrodes should be either Pre cast or Cast in situ in high quality electrically conductive aggregates (Make: Marconite or Equivalent), having resistivity of 0.001 Ω-m and ph value in the neutral range (To be provide certificate to this effect from the manufacturer). Pre cast earth electrode should be placed in a trench of minimum depth of 3000mm or In situ cast of earth electrode should be by directly filling the voids around the metal conductor in a bore hole of size Dia 150mm x 3000mm Depth (02 Nos), with slurry of concrete of electrically conductive aggregate, cement & water. Resulting in increasing of the contact surface area of the of the earth electrode and to achieve the desired earth resistance value of < 5 Ω permanently without the need of periodic watering, recharge or any maintenance during it’s entire life of 10 years in the all types of soil including dry, rocky or soil having boulders & gravels etc. Desired earth resistance value of < 5 Ω shall be achieved with required number of multiple interconnected earth electrodes, as per the design calculations / soil resistivity of the location of the installation vide item No 16 here in after. Electrically conductive aggregate (Earth enhancing material) of Pre cast / In-situ cast electrodes should not leach into adjacent soil or underground water channels complete all as specified and directed by AGE (I) and as per the description and detail mentioned as Annexure 'A' and relevant provisions and design condition in Particular Specification here in after. NOTE:- The rate shall also include the rate of the following :- (i) Supply and laying of copper bonded MS strip of size width 25 mm x Thickness 6 mm, horizontally in a trench at a depth of 600 mm below the surface level to interconnect the multiple earth electrodes with embedding of strip in high quality electrically conductive aggregate with cement and water, size: 70 sqmm x full length [upto 6M length (3M x 2 Nos) for interconnection between electrodes] and then cover the horizontal trench with sieved / fresh field / paddy soil and dress to a level surface. Make of aggregate: shall be: Marconite or Equivalent, having resistivity of 0.001 Ω-m and ph value in the neutral range. (To be provide certificate to this effect from the manufacturer) (Marconoite embedded copper bonded MS strip of size 25mm x 6mm of beyond 6M shall be measured and paid separately under serial item No 17 here in after) (ii) Making of risers by connecting Earth electrodes with Earth bus bar which is made of Copper bonded and embedding with high quality conductive material aggregate with cement and water on MS strip of size 25mm (Width) x 6mm (Thickness) and length as required for connecting Earthing grid with equipment and cost of the strip shall be measured and paid separately under relevant item of this schedule. (iii) Excavation of the earth work of trench [250mm dia for 3.2m depth (02 Nos)] by using suitable technology for placing the vertical Earth electrodes and excavation 300mm x 600mm for laying of Earth strip horizontally for connection to make grid mat in hard/ rocky soil and cost for the same shall be measured and paid separately under relevant items of this schedule.

Excavation in trenches in soft/loose soil etc n. exc 1.5 m wide and depth exc 1.5m but n. exc 3m for foundation/earthing pit etc and getting out in soft/loose soil complete all as specified and directed.

Returning, filling in soft/loose soil, including, spreading, levelling, watering and well ramming in layers not exc. 25 cm thick complete all as specified and directed.

Removing excavated materials (soils) to a distance not exc 50 m and depositing where directed at a level not exc 1.50 m above the starting point, complete all as specified and as directed.

Supply and fix FRP earth pit cover of 400mm dia (Top) and 450mm (bottom) complete with cover of colour (Green/red/Yellow) as approved by AGE(I) complete all as specifiedd and as directed

Taking out old un-serviceable strip / pipe / plates / chemical earth electrodes from the soil with GI / Aluminum strips, test points, terminal boxes of all sizes and removal of old material and debris from the work site, complete as specified and as directed.

Removal of old un-serviceable GI / Aluminum / Copper strip of any size including removal of saddles, screws etc. and making the disturbed surface good, complete all as specified and as directed.

Supply and fixing of copper strip for roof and down conductor, size W 20 mm x 3 mm, on insulating saddles with SS screws up-to earth bus bar on the wall near the ground at 1000 mm above the surface level, complete all as specified and as directed.

Supply and fix copper screws/nuts and bolts Machine made with hexagonal or square heads at one end and screwed the other each screwed end to be fitted with washers and one hexagonal or square nut of dia 5 mm to 10mm , n exc 25mm long all as specified and directed.

Re-fixing of GI / Aluminum / Copper strip of any size, as retrieved from item no 7, here in before, at the same or any other location by providing new insulating saddles and SS screws, making good the disturbed surface, complete all as specified and as directed

Supply and fixing in repair test point terminal block made of gun metal or phsphorus bronze size 75 x 75 x 25 mm drilled and screwed including 3 Nos, 8mm dia 25mm long hexagonal head screw complete all as specified and directed

Fabrication and installation of cubical shape enclosure of size 150mmX150mmX100mm(depth) for fixing inside the test point terminal block made out of MS sheet of 2mm thick with front detachable cover, anodized fixing screw cap, wshers 04 Nos to be mounted on wall with wooden plugs and screws 04 Nos duly painted inside and outside by two coats of aluminium paints over a coat of redoxide primer complete all as specified and as directed.

Supply and fixing GI Pipe of 32mm dia "light grade" suitable for protection of earthing strip complete all as specified and as directed.

Material and labour for strip route indicator made of PCC (1:3:6) type of C1 of size 30cm long, 30X30 cm cross section with lean concrete of 30X30cm PCC(1:4:8) type D2, 150mm circular CI plate and engraved with Lightning arrestor/Equipment Earth/ Power supply Earth/Signal Earth etc to be installed with 50X5X5m long angle iron complete all as specified and as directed.

Supply of Good quality field / paddy soil as approved by AGE(I), to be obtained from outside of defence land, for re-filling the trench or earth pits complete all as specified and as directed.

Measurement of soil resistivity value of the location for installation of earth electrode / interconnected earth electrode/earthing system. Report should consist of the detailed design calculations to achieve the desired earth resistance of < 5 Ω on the basis of measured soil resistivity along with lay out drawing of calculated earthing system, complete as directed.

Supply and laying of copper bonded MS strip of size: width 25 mm x Thickness 6 mm, horizontally in a trench at a depth of 600 mm below the surface level to interconnect the multiple earth electrodes with embedding of strip in high quality electrically conductive aggregate with cement and water, size: 70 sqmm x full length and then cover the horizontal trench with sieved / fresh field / paddy soil and dress to a level surface. Make of aggregate shall be: Marconite or Equivalent, having resistivity of 0.001 Ω-m and ph value in the neutral range. (To be provide certificate to this effect from the manufacturer)

M/S DEEDAR ENTERPRISE