REPAIR/ REPLACEMENT/ MAINT TO EARTHING PITS FOR EQUIPMENTS / INSTALLATIONS AND CONNECTED WORKS INCLUDING CONVERSION OF NORMAL EARTHING IN TO CHEMICAL EARTHING AT AF STN BARRACKPORE UNDER GE (AF) BARRACKPORE

Amount

Material and labour for checking earth resistance (E-R value) and neutral voltage (E-N value) reading for earthing and submit the report with result duly signed by the user as per format sample given in triplicate by department during execution of work complete all as specified and directed. Note:- (i) Earth resistance to be checked as per the direction of Engr-in-Charge. (ii) Contractor should be responsible for provide testing equipment and all other stationery & register etc all as required without any extra cost. (iii) Contractor should be responsible to obtain user signature in register after reading.

Taking down GI / copper / aluminium strip including porcelain insulator complete all as specified and directed.

Material and labour for earthing continuity conductor or main earthing lead fixed to wall or recess or chases or burried in ground with 20 x 3.15 mm copper strip etc complete all as specified and directed. Note : Joining of copper strip shall be made by brazing after fixing of nuts & bolts.

Material and labour for galvanised iron strip of size 32 x 6mm buried in ground or on wall complete all as specified and directed. Note : Joining of GI strip shall be made by welding after fixing of nuts & bolts.

Material and labour for 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. Note : Joining of aluminium strip shall be made by brazing/soldering after fixing of nuts & bolts.

Material and labour 40mm dia galvanised steel tubes (light grade) with fittings, laid in trenches / wall for protection of underground earth strip when crossing the road / fixing on wall including taking down old unserviceable pipe complete all as specified and directed.

Material and labour for PCC (1:3:6) type C-2 (using 40 mm grade stone aggregate) as in foundation and mass concrete complete all as specified and directed

Materials and labour for 50mm dia high density polyethylene pipes (HDPE) of pressure rating 6 kgf/cm2 to protect earthing strip on walls or in floors etc including taking down old unserviciable existing pipe complete all as specified and directed.

Material and labour for test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 nos 8mm dia 25mm long hexagonal head screw including taking down old existing unserviciable terminal block complete all as specified and directed.

Supply and fix in repair thermoplastic enclosure box of size 300x150x170mm with opaque lid fasteners for tool operation protection of IP-66 for fixing of test point terminal box complete all as specified and directed. Make:- HENSEL / SINTEX / C&S

Supply and fix in repair lightning strike recorder 7 digits electromechanical display to record the lightning current in an IP 67 enclosure with the minimum sensitivity of 1500 Amp and maximum capacity of 220 KA (8/20 micro second wave form) complete all as specified and as directed. Make: - LPI/True Power/ Ashlok.

Material and labour for air termination single pointed copper rod, 12mm dia and 300mm long including necessary fixing arrangment using clamps,nuts and nuts including taking down old unserviceable air termination rod complete all as specified and directed.

Supply and fix in repair porcelain insulator for supporting or passing or Aluminium/ GI/ copper strip from roof / wall including necessary nuts and bolts complete all as specified and directed.

Materials and labour for for Cross arm bracings, supports, clamps of size 30x3mm and back plates fabricated from structural steel sections including nuts, bolts, washers, welding, bending cold or hot, drilling holes for bolts, in any shape or size as indicated or directed and inclusive of two coats of synthetic enamel paint over a coat of zinc chrome primer including dismantling of undersize / defected cross arms/ clamps of M.S. channel or angle of any sections complete all as specified and as directed.

Material and labour for construction of earth pit made out of cement concrete (1:3:6) type C-1 (using 40mm graded stone aggregate) and cover slab made out of precast RCC (1:1.5:3) type A-1 (using 20mm graded stone aggregate) of size 42 x 42 x 6cm thick reinforced with 8mm dia TMT bars @ 15 cm c/c both ways with 10mm dia mild steel round bar of 30 cm long, bent to shape as lifting handle, funnel, wire mesh including dismantling of old existing earth pit complete all as specified and directed .

Material and labour for earth continuity conductor or main earthing lead of 4mm dia galvanised iron or steel wire fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or DB's/Indoor type LT PBs or any other indicated situation for loop earthing etc. including taking down old unserviceable wire complete all as specified and directed.

Material and labour for painting of earth pit chamber by two coats of synthetic enamel paint after cleaning earth pit properly with iron wire brush complete all as specified and directed.

Material and labour for excavating for earth pit of size 45 cm x 45 cm x 60 cm into the adjacent of the high resistance value GI earth pit, make a bore of dia 200 mm to a depth of 2 meter, providing GI strip of size 32x6mm with the protection of 40 mm dia GI pipe (light grade) of 2 meter length including necessary filling of Back Fill Compound ( 1 bag of 25 Kg) (conductolite) into the bore hole around the protection pipe and connect the GI pipe with 32 x 6 mm GI strip including connection with the existing strip by proper welding/soldering including returning filling complete all as specified and directed. Note:Joints at both ends of GI pipe and GI strip should be welded .

Material and labour for welding/soldering/brazing to the GI/copper/aluminium strip joints in replacement of existing nuts bolts joints complete all as specified and directed.

Supply and fix FRP polyplastic Pit cover having dia 300mm and capable with stand in adverse weather condtion for chemical earthing complete all as specified and directed.

Material and labour for refixing / re-alignment of existing air termination rod alongwith necessary clamping and PVC sleeve of any specification / position complete all as specified and directed. Note:- If PCC required at site for errection of the air termination shall be measured and paid under respective item.

Material and labour for excavating for earth pit of size 45 cm x 45 cm x 60 cm into the adjacent of the high resistance value copper earth pit, make a bore of dia 200 mm to a depth of 2 meter, providing copper strip of size 25 x 3 mm with the protection of 40 mm dia GI pipe (light grade) of 2 meter length including necessary filling of Back Fill Compound ( 1 bag of 25 Kg) (conductolite) into the bore hole around the protection pipe and connect the GI pipe with 25 x 3 mm copper strip including connection with the existing strip by proper welding/soldering including returning filling complete all as specified and directed. Note:Joints at both ends of GI pipe and copper strip should be welded .

Material and labour for earthing complete with copper earth plate electrode of size 600 x 600 x 3.15mm thick buried directly in ground with earth pit not less than 2.25 meter deep below ground level with top edge of plate not less than 1.5 meter below normal ground level connected to copper strip of size 20 x 3mm earth lead by means brazing after fixing of nuts, bolts, check nuts, washers of galvanised iron steel, protected by 40 mm bore HDPE pipe of pressure rating 6 kgf/sqcm all as directed including cement concrete (1:3:6) type C-1 earth pit with precast RCC (1:1.5:3) type A-1 cover slab of size 42 x 42 x 6cm thick reinforced with 8mm dia TMT bars @ 15 cm c/c both ways with 10mm dia mild steel round bar of 30 cm long, bent to shape as lifting handle, funnel, wire mesh, 20 mm bore galvanized iron pipe (medium grade) for watering, earth testing point, charcoal or coke and salt in alternate layers with necessary earth work in soft/loose soil complete all as shown in electrical plate No 3 of SSR Part I including testing on completion including taking down old existing unserviciable earthing complete all as specified and directed. Note:- Strip upto 7.5m length including testing shall be included in quoted rates.

Supply and installation of advance encapsulated compound based CPRI tested maintenance free, pipe-in-pipe technology upgraded (zinc & alloy coated), zinc coating ( 80-100) microns with pure zinc (99.9%) & alloy coating (200-250)microns. Earthing system conforming to IS-3034, ASEEL-39. The outer and inner pipe should be 76.2 mm & 41.9 mm, 3mtrs length, zinc coated with additional special alloy coating 300mm on the top side for additional corrosion protection of the terminal. The annular space between the pipes being filled up with COMPACT FILL(CF) (Crystalline Conductive Compound). The COMPACT FILL (CF) mixture which is machine pressed in the pipes should not disintegrate or collapse when outer pipe corrodes. The inner pipe should be extended with terminals for connectivity. The job includes digging the pits of dimension 60cm X 60cm up to depth of 3.1m and replace the soil with low resistive soil as approved by Engr-in-Charge, then make a bore of dia 200mm of depth 3.1m and refilling the same by conductolite back fill compound (Ground Enhancer), the BFC should be eco friendly it should not contain environmentally hazardous material / metal having RoHS Certification from NABL accredited lab. Good earth is to be arranged to fill the excavated pits by mixing the same with BFC 2 bags (conductolite) including FRP (Fiber reinforced plastic) light weight, high mechanical strength, chemical resistance with detachable easy locking lid of size 250mm X 250mm of thickness 2mm and the earthing should be installed by applicator of the manufacturer / authorised dealer including taking down old existing unserviciable earthing complete all as specified and directed. Make- ASHLOK / MACKMET/CAPE

Supply and installation of advance encapsulated compound based CPRI tested maintenance free, pipe-in-pipe technology upgraded (zinc & alloy coated), ZINC COATED( 80-100)microns with pure Zinc (99.9%) & ALLOY COATING (200-250)microns. Earthing system confirming IS-3034, ASEEL -39. The outer and inner pipe should be of dia 76.2 mm & 41.9mm 2mtrs Length, Zinc coated with additional special alloy coating 300mm on the topside for additional corrosion protection of the terminal. The annular space between the pipes being filled up with COMPACT FILL (CF) (Crystalline Conductive Compound). The COMPACT FILL (CF) mixture which is machine pressed in the pipes should not disintegrate or collapse when outer pipe corrodes. The inner pipe should be extended with terminals for connectivity The job includes digging the pits of dimension 60cm X 60cm up to depth 2.1m and replace the soil with low resistive soil as approved by Engr-in-Charge, then make a bore of dia 200mm of depth 2.1m and refilling the same by Conductolite Back Fill compound (Ground Enhancer), the BFC should be eco friendly it should not contain environmentally hazardous material/metal having RoHS Certification from NABL accredited lab. Good earth is to be arranged to fill the excavated pits by mixing the same with BFC 1 bags (conductolite) (as per soil condition), including FRP (Fiber reinforced plastic) light weight, high mechanical strength, chemical resistance with detachable easy locking lid of size 250mm X 250mm of thickness 2mm, and the earthing should be installed by applicator of the manufacturer / authorised dealer including taking down old existing unserviciable earthing complete all as specified and directed. Make- ASHLOK / MACKMET/CAPE

Material and labour for earthing complete with GI earth plate electrode of size 600 x 600 x 6 mm thick buried directly in ground with earth pit not less than 2.25 meter deep below ground level with top edge of plate not less than 1.5 meter below normal ground level connected to GI earth strip of size 32 x 6 mm earth lead by means of nuts, bolts, check nuts, washers of galvanised iron as steel, protected by 40 mm bore HDPE pipe of pressure rating 6 kgf/sqcm all as directed including cement concrete (1:3:6) type C-1 earth pit with precast RCC (1:1.5:3) type A-1 cover slab of size 42 x 42 x 6cm thick reinforced with 8mm dia TMT bars @ 15 cm c/c both ways with 10mm dia mild steel round bar of 15 cm long, bent to shape as lifting handle, funnel, wire mesh, 20 mm bore galvanized iron pipe (medium grade) for watering, charcoal or coke and salt in alternate layers with necessary earth work in soft/loose soil complete all as shown in electrical plate No 3 of SSR Part-I including testing on completion including taking down old existing unserviciable earthing complete all as specified and directed. Note:- GI strip upto 7.5m length including testing shall be included in quoted rates.

Material and labour for earthing complete with GI earth plate electrode of size 600 x 600 x 6 mm thick buried directly in ground with earth pit not less than 2.25 meter deep below ground level with top edge of plate not less than 1.5 meter below normal ground level connected to GI wire 4 mm dia earth lead by means of nuts, bolts, check nuts, washers of galvanised iron as steel, protected by 20 mm bore HDPE pipe of pressure rating 6 kgf/sqcm all as directed including cement concrete (1:3:6) type C-1 earth pit with precast RCC (1:1.5:3) type A-1 cover slab of size 42 x 42 x6 cm thick reinforced with 8mm dia TMT bars @ 15 cm c/c both ways with 10mm dia mild steel round bar of 30 cm long, bent to shape as lifting handle, funnel, wire mesh, 20 mm bore galvanized iron pipe (medium grade) for watering, earth testing point, charcoal or coke and salt in alternate layers with necessary earth work in soft/loose soil complete all as shown in electrical plate No 3 of SSR Part-I including testing on completion including taking down old existing unserviciable earthing complete all as specified and directed. Note:- GI wire upto 7.5m length including testing shall be included in quoted rates.

SARKAR AND COM (BID ID -3473220)

JAGATRAM CONSTRUCTION (BID ID -3473260)

BISWAS CONSTRUCTION (BID ID -3473235)

JADAV CONSTRUCTION (BID ID -3473652)

VISHAL ENTERPRISE (BID ID -3473526)

BHATTACHERJEE CONSTRUCTION (BID ID -3473312)