COMPREHENSIVE MAINTENANCE OF LIGHTNING PROTECTION SYSTEM, FIRE DETECTION AND ALARM SYSTEM INCLUDING REPAIR/ MAINTENANCE OF EQUIPMENT OR BUILDING EARTHING AT INS MANDOVI UNDER GE (P) NAVY MANDOVI

Supply & fixing in replacement air termination single pointed copper rod 12 mm dia and 300 mm long with necessary fixing arrangement on roof complete all as specified and directed.

S & F replacement Copper strip 20 x 3 mm with saddles and fixing screws etc. for roof conductors with rubber & bitumen washer & fixed to porcelain insulator, brazing of copper strips overlapping of not less than 10cm on wall for down conductor complete all as specified and directed

Supply and fixing replacement porcelain vitreous white/brown/green spacers insulator of size 75mmx35mmx40mm height complete with one number galvanized iron stud bolts 6mm dia x 40mm long including nut & washers and two number galvanized iron fixing bolts of size 6mm dia and 50 mm long including washers and drilling holes for holding /foxomg aluminium strip/roof conductor as required including taking down the broken insulator complete all as specified and as directed by the Engineer-in-Charge.

M&L in replacement Tubes,light grade' galvanised, with all fitting and fixed complete to walls and ceilings by flat iron clamp nuts bolts etc complete or laid in floors 40 mm dia complete all as specified and directed.

Supplying and fixing in repairs earth continuity conductor or main earthing lead of Galvanised iron wire of size 25 x 4 mm fixed on wall /inside the cable trench with from existing earth test point complete all as specified and as directed by the Engineer - in - Charge.

Supply and fix in replacement power line SPD single pole + NPE of voltage rage Uc 320 V , 1 P +NPE complete with eclosure for fixing the SPD on wall including wiring using 4.0 SQ mm Single core multi stranded copper conductor with existing DB placed adjesent on wall comple all as specified and as directed. Havells : DHSAARAC50320

Supply and fix in replacement power line SPD 4 pole of voltage rage Uc 550 V ,4 pole complete with eclosure for fixing the SPD on wall including wiring using 4.0 SQ mm Single core multi stranded copper conductor with existing DB placed adjesent on wall comple all as specified and as directed. Havells : DHSAARBC50320

M & L earthing complete with copper earth plate electrode of size 60 cm x 60 cm x 3 mm thick burried directly in ground (earth pit not less than 2.25 m deep below ground level) with top edge of the plate not less than 1.5 m below the normal ground level connected with Copper strip 20X3 mm by means of bolts, nuts, check nuts & washers of galvanished iron steel including necessary excavation and earth work in any type of soil, removing surplus soil to a distance not exc 50 m, with and including PCC chamber in PCC (1:2:4) , type B1, using (20 mm graded stone aggregate), mild steel angle iron frame made out of MS angle iron of size 40x40x6 mm thick duly painted with two coats of synthetic enamel paint over one coat of red oxide zinc chrome primer hinged with and including 6mm thick CI cover with handle, watering arrangement with funnel internally secured with wire mesh with 20 mm dia medium grade pipe for watering ,40 mm dia light grade GI pipe for lead protection in & including copper - sulphate e all as shown in electrical plate No 5 and connected to earthing test point all as specified and indicated including testing on completion and marking of description of earthing on GI plate grouted on the earth chamber complete all as specified and directed Note : ( i) The Value of Earthing Should be not less than Five Ohm. .

Supply and installation of maintenance free earthing system comprises of molecularly bonded copper of 99.9% purity on low carbon steel of 3 m length, having a diameter of 25 mm with copper coating thickness of 250 microns with fault current withstand capability of 30 KA rms value of 1 second and I peak of 80 KA (OBO Article type 25 3000 CCER), tested as per IEC 62561-2, meets the requirement of IS-3043 & IEC 60364-5-54, tested in CPRI for short circuit with standing capacity, OBO article type OEC 25 Earth conductivity enhancing mineral compound to be used as a backfill compound for earth electrodes; highly conductive in all weather conditions is used for improving the soil conductivity. The material shall be mineral inert to sub soil and shall not pollute the environment and non corrosive to earth rod. The material should have a resistivity less than 0.2 ohm -m. It should be free from hazardous substances. The mineral compound is required to have minimum 25 kg of the total composite, Universal clamp (OBO Article Type 25 25 RTC) made of SS 304 for clamping, Polypropylene & polyethylene (OBO type UFE) Earth electrod inspection chamber with heavy duty cover should be used to cover the earth rod. The dimension shall be 170mm x 170 mm x 190 mm with a weight bearing capacity of 50 KN. including provision and laying copper flat 20 x 3 mm thick from earth electrode to test joint directly in ground as required cross sectional area. Make : OBO / ABB / Ashlok .