PROVISION OF MAINTENANCE FREE CHEMICAL EARTH PIT AT VARIOUS LOCATION AT AF STN BIHTA

Amount

Supply and fixing Tripod Earthing (3 Set earthing inter connected to 1 set) maintenance free Earthing Solutions comprising with the following: - - Supply and fixing after digging bore of suitable size the CPRI tested and UL certified maintenance free earthing system having a set of copper bonded Earth Rod of 3 meter length, 17.2 mm dia made of high tensile low steel circular rods, molecularly bonded with 99.90% electrolytic grade copper on outer surface (minimum copper bonding thickness - 250 microns) with exothermally jointed copper bus bar of 200X25X6mm for long lasting and connection. Earth Copper bonded rod & exothermically jointed bus bar should be CPRI tested on 25KA fault current complete all as specified and directed by engg-in-charge for complete connections. - Qty 3 Nos. - Earth Copper bonded Electrode should be tested by CPRI - Current carrying capacity of Earth Copper bonded Electrode is 25KA/Sec.

Item 1.00 Contd..... - Supply and filling of carbon based, eco friendly earth enhancing compound of RHOS tested compound tested by NABL accredited Lab in compliance to IEC 62561-7 and having passed leaching, sulphur, corrosion resistivity test as per IEC 62561-7 an international standard for earth enhancement compound in compliance to IEC 62561-7 with a resistivity < 0.12 ohm-m, 25 kg, Qty- 3 Nos. - Earth enhancing compound shall be free from corrosion, it shall be carbon based material and shall be free from bentonite and other hazardous substances. The product does not dissolve, deteriorate or leach out of time. It shall be highly conductive and improves earth's absorbing power and humidity retention capability, It shall be eco-friendly and chemically inert to sub soil. - Supply and fixing plastic Earth pit Cover of size 247mm x 338mm x 210mm having load bearing capacity of 8 Ton and complying IEC 62561-5. Qty - 3 Nos. Note - On testing after completion of job, if desired earth resistence is not found i.e. below 1.00 Ohms, the earthing shall be redone at no extra cost to the Govt. Make: JMV LPS Limited/Ennov/Advance Earthing Solutions (AEs)

Supply & fix copper strip 20mm x 3.15mm with saddles and fixing screws for roof conductors and down conductors above ground to extend earthing lead from pit to building wall, inncluding GI protection pipe of required length and size, complete all as specified and as directed.

M & L test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 Nos. 8mm dia 25mm long hex. head screw, complete all as specified and directed.

Supply and Fix single core PVC insulated 16 sqmm multi stranded flexible copper conductor cable 1100 volts conforming to IS 694 as down conductor including provision of suitable clamps /saddles etc, complete all as speciied and as directed by Engg-in-Charge.

Excavation in trenches in soft/loose soil n. exc 1.5m wide and n. exc 1.5m in depth for laying under ground cable, cable ducts or for foundations etc and getting out including forming bottom surfaces, complete all as specified and directed.

Returning, filling in soil including spreading, leveling, watering and well ramming in layers n.exc 25 cm thick complete all as specified and directed.

Removing of excavated material (soil) not exc 50 mtr away and depositing where directed at a level not exc 1.5 mtr above the starting point, complete all as specified and directed.

Supply & Laying of galvanising iron tubing, medium grade with all fitting laid in trenches, dia of pipe 15 mm, complete all as specified and directed.

M & L for fixing of bib tap cast copper alloy with crutch or butterfly handle, screwed down for iron pipe or for brass ferrule of size 15 mm dia, complete all as specified and directed.

M & L for cutting/Drilling existing 40-50 mm bore steel tubing for alteration or addition and providing new branch connection for earthing, complete all as specified and directed.

S&F IDENTIFIER/MARKER made out of mild steel plate of size 30cmx20 cmx4mm thick fixed by means of two Nos of rivets on mild steel strip of size 30mmx8mm thick and 70 cm long painted with synthetic enamel paint (except embeded portion) with following colour coding to identifier. (a) For chemical earth pits - Red Colour (b) Lightning Arrester-LA (Oval Shape) (c) Equipment Earth-EQ (Triangular Shape) (d) Signal Earth-SG (Dome Shape) (e) Power Supply Earth-PS (Square Shape) Notes:-(i) Height of the identifier should be 60 cm above the ground level all as specified. (ii) Quoted rate shall be deemed to included cost of PCC Block 1:3:6 using 40 mm graded stone aggregate size 45 cmx45 cmx20cm including necessary excavation and earth work and tarring of embedded portion. (iii) Writing letters shall be painted with black colour synthetic enamel paint on plate and the size of writing letter on earth pit identifier shall not be less than 10 cm high (LA for lightning arrester earth pit, E for equipment earth pit and PS for power supply earth pit) and Quoted rate shall be deemed to include cost of writing letters.

ARTI ENTERPRISES

Roy and Sons Infrastructers

MITHILA BUILDERS AND ENGINEERS

Jai Maa Construction

RADHESHYAM PASWAN