PROVN OF CHEMICAL EARTHINGS FOR DIFFERENT E/M INSTALLATIONS INCL CONNECTED WORKS UNDER GE DSSC WELLINGTON

Amount

Supply, Installation, Commissioning and Testing of Maintenance Free Earthing system comprising of the following :-

Copper Bonded Steel Earth Rod of 3 meter length and 14.2 mm diameter. Auger a hole of diameter 3 inch and 9 feet depth in the soil, placing the Earth rods in to the augured hole, hammering the rods to 1 feet depth, removing excavated material. Make ERICO Cat Part No:CODE615800 or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge. Brief features/ specifications of CBSE Rod is as follows:-

(a) The outer surface must be molecularly bonded with uniform layer of 250 micron Copper, 99.9% pure electrolytic copper coating. (b) Nickel interface must be provided between the copper and steel to avoid the galvanic corrosion. (c) Must be capable of withstanding fusing current of 20 KA @ 1 Sec. (d) Earth rod must be in compliance with IEC 62305- 2, NBC 2010 and IEEE 80. Rod should be tested as per IEC 62561- 2 standard. (e) Tensile strength greater than 80000 PSI on 12 mm. (f) High resistance to corrosion. (g) Material category number should be UL listed, Manufacturer Make, Part No and UL mark should be printed in each rod.

M&L for Ground Enhancement Material (GEM) , Per Bag -11.33 Kgs ,Conforming to IEC 62561-7 Standard, , Premixing the GEM into slurry form using water( not more than 5 L to 6 L per bag), Pouring the GEM mixture in the augured hole and filling. Make ERICO Cat Part No: GEM 25A- 25-1lb or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge. Brief features/ specifications of the same is as follows:-

(a) Must be carbon based superior conductive material. (b) Resistivity must be less than 2 Ω-cm. (c) Must not cause corrosion to copper when in contact. (d) Must not expand or experience any shrinkage once set. (e) Must not depend on the continuous presence of water / moisture / salt to maintain its conductivity. (f) Must not decompose or leach out with time. (g) Must not contain hazardous chemicals as per IEC 62561-7 standard,TCLP Tested. (h) Flexural and possess compressive strength as per relevant standard. (j) Sulphur content must be less than 2%. (k) Must be inline with IEEE 80 clause 14.5.d. (l) Corrosion test shall be conducted on the material under both aggressive and non aggressive conditions. (m) Installation Instruction and Material DATA sheet should be printed in each package.

M&L for Readymade PVC Heavy duty earth chamber (250 mm Dia , 260 mm Height) with round cover and minimum 5 ton load bearing capacity, marking earth resistance value on it in painting. Make ERICO or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge.

M&L for 10 mm Copper Bonded Steel Round Conductor, minimum copper bonding shall be 254 microns having continuous coin form, compliant with the IEC 62305 and should be tested as per IEC 62561Edition 2.0 standard, material category/ part number should be UL listed, the conductor core should consist of a low-carbon steel grade for improved flexibility. The copper surface of the conductor should provide high conductivity and corrosion resistance properties, should not crack or tear when conductor is bend well‐suited as a earth lead conductor or equipotential bonding conductor. Including excavation depth 50 cm for laying round conductor, removing excavated material, return filling or fixing with holder.Make ERICO Cat Part No:CBSC10 or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge.

S & F Clamp Holder made up of 304 grade SS with SS bolt and nut at every 1 m distance of round conductor. The clamp should be suitable for Copper Bonded Steel Conductor of size 10mm. Make ERICO Cat Part No: CSS10 or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge.

M & L for terminal connections to existing earth from maintenance free earth pit for equipment bonding by mechanical means using nuts, bolts and all other accessories complete as required by Engr-in-Charge. Make ERICO Cat Part No: BCR10T or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge. Note: Terminals of existing earth pits shall be cleaned for proper contact with CBSC.

M & L for Cadweld Materials for Connections between Ground Rod with CBSC conductor by Exothermic reaction. Connections to be made with a semi-permanent graphite mould, which shall hold the conductors to be welded. Weld metal must be a mixture of copper oxide and aluminium, should be compliant with IEEE 80 standards and tested as per IEEE 837 -2014 standard . Make ERICO Cat Part No: 150 PLUS F20 or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge.

M & L for 250x50x3 mm common bus bar for earth connection with suitable base clamps & insulators, providing DD universal pattern for 8 nos of holes for connections Make ERICO or techno-commercially equivalent of DEHN/ SIEMENS complete all as specified and as directed by Engr-in-Charge.

M & L for cutting the existing hard standing/PCC/WBM road at a depth not less than 30x30 cm in width for passing of Pipe line/ cable through pipe, returning, filling in, complete including finishing the top surfaces by providing cement concrete (1:3:6) type C2 (using 40 mm graded stone aggregate) 20 cm thick on top, PCC surface finished to a uniform smooth surface, bottom filled with excavated earth complete all as specified and directed by Engr-in-Charge.

M &L for cutting grass, bushes, creepers, weeds, unwanted plants/ growths etc., in and around the substation, panel board, generator or any other locations as decided by Engr-In-Charge/ GE and removing rubbish off the premises complete all as specified and to the entire satisfaction of the Engr-In-Charge.

Supply, jointing, testing and laying in trenches/wall etc High density polyethylene pipes (HDPE) of pressure rating 6kgf/Sqcm, ISI marked with all running fittings of size 25 mm bore complete all as specified and as directed. Make: Finolex/Astral/Supreme./Prince/Ashirwad

IMPORTANT NOTES FOR SER ITEM NOs 1 To 9 (a) The complete work of the Earthing system is to be got done from the OEM or their authorized sister concern/ channel partner only. (b) Design/Drawing/BOM/Technical Specifications of the complete earthing system showing the layout including dimensions is to be obtained from OEM strictly keeping in view the actual ground requirements & the same is to be got approved from Engr-in-Charge & GE before placing final order to the OEM. (c) Any items missed out in the technical specification, but technically required for efficient working of the system is deemed to be included in the unit quote rates. (d) The contractor/firm is required to visit the site prior to quoting of the subject items/ work so as to ascertain the actual ground requirement incl soil resistivity tests etc. Any further query at a later date shall not be entertained & responsibility of the same shall rest on the contractor/ firm. (e) Comparative analysis in respect of the items wherever techno-commercially equivalent w.r.t the given Cat/Part/Model ref concerned is to be submitted to the Engr-in-Charge & GE for approval. (f) The cost of making good the disturbed surfaces (Substation yard Stones and gravels , Walls, Pavement etc) is deemed to be included in the unit quoted rate of relevant items. (g) On testing, if the desired earth resistance is not found according to the relevant Indian standards it is to be redone to the entire satisfaction of Engr-In-Charge at no extra cost to the Dept., after completion of work contractor should submit a detailed Report of Earth resistance test results from OEM and same is to be certified from Engr-in-Charge & GE. (h) Repair/ Preventive maintenance of the complete earthing system is to be got done from the OEM/ Sister Concern/ Channel partner only by the contractor for the entire defect liability period i.e two years from the certified date of completion & the cost of the same is deemed to be included in the unit quote rates. (j) If any damage to any electrical/ communication cables or to any pipe lines or any other installations occurs during execution of the work then the same shall be made good by the Contractor to the entire satisfaction of the concerned & the cost of the same is deemed to be included in the unit quoted rates. (k) Testing at an interval of 6 months of the entire earthing system is to be got done from the OEM/ Sister Concern/ Channel Partner only by the contractor & report submitted accordingly to the Engr-in-Charge for the entire defect liability period & and the cost of the same is deemed to be included in the unit quote rates. (l) Purchase Vouchers & Manufacturers test certificates to be submitted in original to the Engr-in-Charge.

UNIQUE INDIA CONSTRUCTIONS

lakshmibuilders