CERTAIN MISC REPAIR REPLACEMENT WORKS OF INTERNAL ELECTRIC DBs SUBMAIN WIRING AND ASSOCIATED INTERNAL ELECTRIFICATION SYSTEM EARTHING AND LIGHTENING PROTECTION SYSTEM IN VARIOUS OTM ACCN AND ADJOINING UNIT AND MD QUARTERS AREA AT SOUTHERN ZONE

Supply and fixing in repair of Aluminium strips of size 25x3.15mm complete with fixing by screw and brazing complete for roof conductors and down conductors including fixing on porcelain insulators with screws complete all as specified and directed by Engineer-in-Charge.

Supply and fixing in repair test point air terminal block made of gunmetal or phosphorous bronze size 75x75x25 mm drilled and screwed including 3 nos of 8mm dia 25mm long hexagonal head screws complete all as specified and directed by Engineer-in-Charge.

Material and labour for earthing with galvanized steel earth plate electrode of size 600 mm x 600 mm x 6.0 mm buried directly in ground (earth pit not less than 2.25 mtr below normal ground level), connected to galvanized earth lead strip of size 25 mm x 4 mm by means of bolts, buts, check nuts and washers of galvanized iron on steel including 40 mm dia light grade GI tubing for protection of earth lead, MS sheet metal funnel with wire mesh, watering pipe medium grade 20 mm dia, charcoal or coke and common salt in alternative layer of 15 cm compacted thickness all around the electrode with concrete earth pit of PCC 1:3:6 type C-1 (using 20mm graded aggregate) , 50 mm thick precast RCC 1:2:4 type B1 (using 20mm graded stone aggregate) pit cover reinforced with 8 mm dia deformed bar and suitable handle made of 10 mm dia round bar including aluminium strip of size 25 mm x 3 mm for extension of earth lead and necessary excavation, earth work, in soil/loose soil and disposal of spoils to a distance not exc 50 mtr and necessary connection and testing complete including providing TestPoint box made of 2.0mm MS sheet of size 200mmx150mmx100mm with front openable shutter panel arrangement all as shown in Electrical Plate No.3 complete all as specified and directed by Engineer-in-Charge.

Supply and fixing in repair GI Pipe medium grade of size 40mm bore of 1.5 mtr height (for fixing terminal) embedded in PCC base foundation 1:2:4 type C1 by (using of 20mm grade stone aggregate) of size 40cmx40cmx30cm over roof of vldg complete all as specified and directed by Engineer-in-Charge.Note : PCC shall be measured and paid seperately.

Material and labour for PCC 1:3:6 type C1 (using 20 mm well graded stone aggregate) of size 40cmx40cmx30cm over roof of vldg complete all as specified and directed by Engineer-in-Charge.

Supply and fixing in repair single pointed Air termination aluminium rod 12mm dia 300 mm long complete all as specified and directed.

Material and labour for earthing with Galvanised Steel earth plate electrode 60cm x 60cm x 6.0 mm thick buried directly in ground (vertically at a depth not less than 2.25metre below normal ground level) with top edge of earth plate at a depth not less than 1.5 metre below normal ground level, earth plate surrounded from all sides by 15cm thick packed layer of charcoal dust and common salt filling in alternate layers and electrode connections by using Galvanised Iron wire 4 mm as earthing lead (upto terminal point) by means of bolts, nuts, check nuts and washers made of galvanised iron and thimbles and protected by light grade 15 mm dia GI pipe connected to main switch board or main control board and GI pipe medium grade 20mm bore for watering and including funnel , wire mesh , RCC pit cover and PCC chamber pit with PCC 1:3:6 type C-2 (using 40mm graded stone aggregate), including excavation and earth work in any type of soil , returning , filling in approved soil and disposal of surplus soil to a distance not exceeding 50m all as specified and shown in electrical plate No 3 of SSR 1991(Part-I) Taking out old unserviceable earthing complete all as specified and directed by Engr-in-Charge. NOTE : - The rates for earth work, GI protection pipe, funnel, wire wesh, CI cover, etc shall be deemed to be including in quoted rates. (ii): The earthing shall be tested for desired result, if not found within limits the earthing will be redone without any extra cost.

Supply and fixing in repair sheet metal enclosures vertical distribution board VTPN,(MCCB DB) 4 ways, double door , 415 volts with suitable size of rated bus bar, IP 54 protection, with shrouded neutral bar and insulated bus bar and earth link, with and including MCCB 4 pole thermal release type ,125 AMPS ,25 kA as incomer and MCBs as out going complete with making suitable size of MS cabinet 1.2 mm thick dully grouted on the wall (flush) with opening arrangement including making connections with suitable size of lugs/thimbles/glands and making good the disturbed surface matching with existing surface including taking down existing unserviceable MCCB/DBs including MCBs complete all as specified and directed by Engr-in-Charge.

All as per Item No 8 here in before but VTPN DB alongwith MCCB 4 pole,100AMPS 16 KA as incomer and MCBs as out going complete all as specified and directed by Engr-in-Charge.

Supply and fixing in repair SPN distribution board 8 way, double door, IP 43, as per IS 8623 including suitable size of fully insulated copper bus bar, insulated neutral bar, earth bar, door earthing, reversible doors, PAN assembly for easy installation and also incoming and outgoing connections with suitable size of lugs/thimbles /gland/gaskets and making good the disturbed surface matching with existing surface including taking down existing unserviceable DBs including MCBs complete all as specified and directed by Engr-in-Charge.