MAINTENANCE AND REPAIRS OF LIGHTNING PROTECTION SYSTEM WITH ALLIED WORKS AT AFS BIDAR

Amount

Dismantling the earth chamber, Excavation and removing the u/s earthing materials along with u/s earth electrodes from the existing u/s earth pits pertains to lightning arrester of installations/ buildings and M &L for chemical Earthing Complete with copper earth plate electrode 90cm x 60cm x 5mm thick buried directly in ground earth pit not less than 5.0 M deep below normal ground level and complete size of pit 1.6 M X1.6 M X 5.0 M earth plate connected to copper strip of size 50 x 6 mm by brazing only earth strip protected with light grade GI Pipe 80mm dia bore from copper earth plate electrode and upto and including the earth test point made of gunmetal Phosporous bronze of size 75x75x25 mm including 25 mm bore water pipe medium grade GI Tubing including GI Funnel , wire mesh. alternate 5 layers of charcoal (250 Kg) & salt crystal (200Kg ) and top two inches layers with Magnesium Sulphate (100Kg) including excavation in any strata, refilling with black cotton soil above the Magnesium Sulphate and removal of the excavated soil and depositing at the place where directed, PCC Pit in PCC (1:3:6) type C1 using 20 mm graded stone aggregate, RCC Cover 40 mm thick in RCC (1:2:4 ) type B 1 using 20 mm grade aggregate reinforced with 8 mm dia TMT bars @ 7.5 mm c/c both ways including MS angle iron frame of 40 X40X 3 mm etc watering the earth pit to acheive earth resistance below 01 OHM including testing complete all as specified and as directed . Note: (i) copper earth strip of size 50x6mm and GI Pipe 80 mm bore light grade up to 7.5m length deemed to be included in the rate quoted by the contractor. Beyond 7.5m copper strip of the size 50x6mm and GI Pipe 80mm bore light grade shall be measuerd and paid under the respective item of the schedule.

Dismantling the earth chamber, Excavation and removing the u/s earthing materials along with u/s earth electrodes from the existing u/s earth pits pertains to lightning arrester of installations/ buildings and M/L for providing earthing complete with Copper earth plate electrode 600 mm x 600 mm x 3 mm thick buried directly in ground earth pit not less than 2.25 Mtr deep below ground level with top edge of the plate not less than 1.5 Mtr below normal ground level, Alternate layers of charcoal & common salt Crystal, in and including back filling compund in layers and filling up with black cotton soil upto the top edge/ ground level and connected to copper earth strip 20 x 3 mm by means of bolts, nuts, check nuts & washers of copper and connecting to earth dolly, equipment all as shown in electrical plate No. 3 of SSR Part I of 2009 & testing complete including 40mm dia light grade GI pipe upto 7.5m long, excavation in any type of strata, PCC (1:3:6) type C1 earthing chamber, pre cast slab 50 mm thick in cement concrete (1:2:4) type B1 reinforced with welded steel wire fabric (XPM) weight not less than 4 Kg / Sqm with frame, including 20 mm bore water pipe medium grade GI Tubing including GI Funnel , wire mesh etc. complete all as specified and as directed . NOTE :- (i) copper earth strip of size 20x3mm and GI Pipe 40 mm bore light grade up to 7.5m length deemed to be included in the rate quoted by the contractor. Beyond 7.5m copper strip of the size 20x3mm and GI Pipe 80mm bore light grade shall be measuerd and paid under the respective item of the schedule

Dismantaling the earth chamber, excavation and removing the U/S earthing materials along with u/s earth electrodes from the existing u/s earth pits pertains to lightning arrester of installation / building and M& L for maintenance free earthing using corrosion resistance earth electrode of copper clad high tensile low carbon steel alloy of 17.20 mm dia and 3 mtr long with copper coating thickness of 250 microns. The pit shall be filled with Back fill compound not less than 50 Kg per pit. PCC chamber of size 300 x 300 mm with suitable size PCC cover with Handle and kept on the suitable angle iron frame to place the cover and shall be provided on the top of the earth system. The electrode shall be bounded with environment friendly earth enhancing compound and including necessary testing complete all as specified and as directed.

Dismantling the earth chamber, Excavation and removing the u/s earthing materials along with u/s earth electrodes from the existing u/s earth pits pertains to lightning arrester of installations/ buildings and M/L for providing earthing with GI earth plate electrode 600 x 600 x 6.3 mm thick burried directly in ground vertically to depth of not less than 2.25 mtr deep below normal ground level with top edge of the plate not less than 1.5 mtr below ground level connected to GI earth wire of 4mm by means of bolts, nuts, washers of GI and provision of earth lead, GI protection pipe with 15mm light grade galvanized and 20 mm bore water pipe medium grade GI Tubing including necessary earth work in any type of soil, PCC 1:3:6 type CI (using 20mm graded stone aggregate) earth chamber and 1:2:4 type B1 RCC cover fitted with 50mm thick with 6mm dia MS bars reinforcement complete all as shown in SSR Pt - 1 electrical plate No 3. including necessary testing complete all as specified and as directed. Note : (i) Quoted rate deemed to include the cost or excavation and earth work PCC Chamber, funnel cover etc. (ii) GI earth wire of 4mmand GI Pipe 15 mm bore light grade up to 7.5m length deemed to be included in the rate quoted by the contractor.

Dismantling the earth chamber, Excavation and removing the u/s earthing materials along with u/s earth electrodes from the existing u/s earth pits pertains to lightning arrester of installations/ buildings and M/L for providing earthing with GI earth plate electrode 600 x 600 x 6.3 mm thick burried directly in ground vertically to depth of not less than 2.25 mtr deep below normal ground level with top edge of the plate not less than 1.5 mtr below ground level connected to GI earth strip of 32x6mm by means of bolts, nuts, washers of GI and provision of earth lead, GI protection pipe with 15mm light grade galvanized and 20 mm bore water pipe medium grade GI Tubing including necessary earth work in any type of soil, PCC 1:3:6 type CI (using 20mm graded stone aggregate) earth chamber and 1:2:4 type B1 RCC cover fitted with50mm thick with 6mm dia MS bars complete all as shown in SSR Pt - 1 electrical plate No 3. Note : (i) Quoted rate deemed to include the cost or excavation and earth work PCC Chamber, funnel cover etc. (ii) GI earth strip of size 32X6mm and GI Pipe 15 mm bore light grade up to 7.5m length deemed to be included in the rate quoted by the contractor.

Supply and laying copper strip 50 x 6 mm on walls/ drawn in GI tubing / in trench as grid conductor complete all as specified and directed.

Supply and laying copper strip 32 x 6 mm on walls/ drawn in GI tubing omplete all as specified and directed.

Supply and laying copper strip 20 x 3.15mm on walls / in trench as grid conductor / strip etc. complete all as specified and directed.

Supply and laying in trenches / fixed on walls / on roof 80 mm dia GI pipe light grade with all fittings such as bends, sockets, reducers union etc, complete as mechanical protection to Copper strip including taking down corroded pipe complete all as specified and directed.

Disconnection and removing the u/s Test block and S & F Test point terminal block made out of PVC Material (SMC ) of size 300x200x105 mm right side hinged in and including two nos of insulators fixed in side the box for terminating the copper strip of 50x6/32x6 mm with all fixing arrangements of nuts, bolts and washers complete all as specified and as directed.

Cutting the existing road of width 0.25m x 0.25m depth x3.0m length for laying the 40 mm dia GI pipe light grade, complete as mechanical protection to Copper strip incluing excavation in any type of soil, refilling, removal and making good the road cut portion with PCC 1:2:4 type BI complete all as specified and directed. Note : GI pipe light grade with all fittings shall be measured and paid under the respective item.

Supply and laid in trenches / fixed on walls / on roof, 40 mm dia GI pipe light grade with all fittings such as bends, sockets, reducers union etc, complete as mechanical protection to Copper strip including taking down corroded pipe complete all as specified and directed.

S&F procelain insulators suitable for copper strip 50x6mm /32x6mm / 20x3 mm on roof /on wall etc. with necessary fixing arrangements complete all as specified and directed.

Supply and laying in trenches / fixed on walls / on roof, 15 mm dia GI pipe Medium grade with all fittings such as bends, sockets, reducers union etc, including taking down corroded pipe complete all as specified and directed.

Supply and laying in trenches / fixed on walls / on roof, 20mm dia GI pipe Medium grade with all fittings such as bends, sockets, reducers union etc, including taking down corroded pipe complete.

Refixing the copper strip of size 32 x 6 mm on walls / in GI tubing as grid conductor / strip complete all as specified and directed.

Refixing the copper strip of size 20 x 3 mm on walls / in GI tubing as grid conductor / strip complete all as specified and directed.

Refixing the aluminium strip of size 25 x 3.15 mm on walls / in GI tubing as grid conductor / strip complete all as specified and directed.

Taking out the old/ broken aluminium strip 25 x 3.15mm from roof/down conductors complete all as specified and directed.

Taking out the old / broken copper strip 20 x 3 mm from walls complete all as specified and directed.

Taking out the old / broken copper strip 32 x 6 / 50 x 6 mm from walls com plete all as specified and directed.

Taking out the old corroded GI tubing 15/20 mm com plete all as specified and directed.

Taking out the old corroded test point terminal block complete all as specified and directed.

Aluminium strip 25 x 3.15mm with saddles and fixing screws etc for roof conductors and down conductors above ground complete all as specified and directed.

Supply only Copper sulphate for strengthening of existing earthings complete all as specified and directed.

Supply only Magnesium sulphate for strengthening of existing earthings complete all as specified and directed.

Measuring of earth resistance value of lighting / Equipment / structure earth pits such as Chemical/ Conventional/ Normal/ Maintenance free earth pits as directed by Engineer-in-Charge. Note : 1. Instruments, PVC cables and materials required to carry out the resisitance test to be arranged by the contractor. 2. Disconnection of earth conductor from the equipment, earth pit and test point and reconnecting the same after testing deemed to be included in the quoted rate. 3. Periodicity of checking shall not be more than one year as per IS. 4. The details of test report with location shall be recorded in MB during claiming payment, duly signed by Contractor and the Engineer-in-Charge.

Supply only commercial / sea salt in layers for strengthening of existing earthings complete all as specified and directed.

Supply only Charcoal dust/Breeze in layers for strengthning of existing earthings complete all as specified and directed.

TMT bar 6mm to 8mm dia, cut to length, bent to shape required including binding with mild steel wire (annealed) not less than 0.9mm dia compete all as specified and as directed.

Earth pit chamber of PCC 1:3:6 type C-1 by using 20mm graded stone aggregate with necessary form work complete all as speciifed in SSR Part - I in different locations and as directed by Engg-in-Charge.

Earth pit chamber cover of RCC 1:2:4 type B-1 by using 20mm graded stone aggregate with necessary form work complete all as speciifed in SSR Part - I in different locations and as directed by Engg-in-Charge.

Rotational moulded polyethylene water storage tank of Capacity 750 Ltrs (cylindrical vertical with closed top) hoisted and fixed in position including taking down existing tank compete all as specified and as directed.

S & F in repairs stop valve 15 mm dia, cast copper alloy, screwed down, high pressure, with crutch or butterfly handle, screwed both ends for iron pipe compete all as specified and as directed.

S & F in repairs stop valve 20 mm dia, cast copper alloy, screwed down, high pressure, with crutch or butterfly handle, screwed both ends for iron pipe compete all as specified and as directed.

Cutting existing steel tubing for alterations or additions [each cut measured] for 25mm bore pipe including necessary excavation & earth work complete all as specified and as directed.

S & F in repairs Ball brass valve of size 20mm, high pressure, with polythene float and flynut complete, screwed for iron pipe complete all as specified and as directed.

Excavation in trenches not exceeding 1.5 m wide and not exceeding 1.5 m in depth for taking out /for laying under ground cables/pipes etc and getting out in soft/loose soil complete all as specified and as directed.

Returning, filling in including spreading, levelling, watering and well ramming in layers n-exc 25 cms in soil complete all as specified and as directed.

Removing excavated soil to a distance not exc 50 mtr and depositing where directed at a level not exc 1.5 m above the starting point complete all as specified and as directed.

Supply and fill in layers not exceeding 15cm spread, levelled and rammed including watering in black cotton soil complete all as specified and as directed.

S& F in repairs 15mm dia bib taps, cast copper alloy with crutch or butterfly handle, screwed down, screwed for iron pipe or for brass ferrule and fixed complete all as specified and as directed.

Brazing of the copper strips with necessary brazing material / gas cylinders / brazing rods and in situation like on walls, floors, roofs, bends etc for copper strip of 20 x 3 / 32 x 6 / 50 x 6mmcomplete all as specified and directed.

PVC insulated single core unsheathed multi stranded cable green in colour conforming to IS with flexibe bright annealed copper conductor of size 50 sqmm suitable for voltage grade upto 1100 V for earthing and including connecting of with suitable copper lugs, nuts, bolts & washer incluing taking down existing cable complete all as per specified and directed.

Air termination, single pointed aluminium rod 12mm dia and 300mm long including fixing arrangement with porcelain saddles/insulators, fixing screws etc. and disconnection and removing the u/s Aluminium Air termination rod complete all as specified and as directed.

Air termination, single pointed copper rod 12mm dia and 300mm long including fixing arrangement with porcelain saddles/insulators, fixing screws etc. and disconnection and removing the u/s copper Air termination rod complete all as specified and as directed.

Earthing pit display board made out of 3 mm thick MS sheet of size 30 x 35 cm welded to 75 cm long 25 x 25 x5 mm thick MS angle iron grouted in PCC 1:3:6 type C1(using 20 mm graded stone aggregate ) to a depth of 20 cm below GL and including applying two coats of synthetic enamel paint of approved colour over a coat of red oxide primer on all exposed steel surface and writing the letters on the plate for showing the following details complete all as specified and as directed. (a) Earthing Pit No., (b) Date of Measurement (c) Next Due Date (d) Standard Value.

Mr Madhusudhan Kotarki

SHREE VAIBHAV ELECTRICALS