SPECIAL REPAIR TO EARTHING PITS EM AT AFS KALAIKUNDA UNDER GE AF KALAIKUNDA

Amount

Taking out old unserviceable GI/Copper earth plate/Chemical electrode from soft and hard soil from any location as directed by Engineer -in- charge.

Material & labour for earthing complete with copper earth plate electrode 600 mm x 600 mm x 3 mm thick burried directly in ground (Earth pit not less than 4 mtr deep below ground level) with top edge of the plate not less than 3.25 mtr below ground level connected to copper strip 20 x 3 mm as earth lead by brass nut bolts washer including brazing the copper strip with copper plate as shown in electrical plate No 3 connected to earth test point including necessary excavation in hard dense soil, rocky / disintergate rock, filling charcoal and salt around the plate in layers , filling the pit with low resistivity agriculture soil free from stones, to be bring from out side defence land and mixed with Bentonite , (3 bags of 25 Kg each ), construction of inspection pit ( earth pit chamber) of brick work of size 600 x 600 x 600 mm with PCC copping of 1 :2: 4 , 12.5 mm aggregate A1 with concrete earth pit in PCC (1:3:6) type C-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:2:4) cover slab (re-inforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) with wire mess, funnel, test point, 40 mm dia GI protection pipe light grade and 20 mm GI peforated pipe for watering etc complete and testing on completion. The electrode and lead shall be of copper all as specified and directed by Engr-in-charge (Copper strip upto 7.5 RM will be included in the item rate and copper strip beyond 7.5 RM will be measured seperately

(Note : (i) Contractor shall use low reistivity fresh agriculture soil , mixed with 3 x Bags of bentonite clay of 25 Kg each for refilling the pit to achive the desired resistance. (ii) copper strip will be laid below 60 cm from ground level and connected to test point through plinth protection (iii) Necessary cost of repair to plinth protection and connected plate and earth continuity conductor by providing 2 x brass nuts bolts and brazing of joints, bringing argiculture soil from out side defence land and cost of 3 x Bags of bentonite deemed to be included in the item rate. (iv) Contractor has to clear the side and disposed off the excavated soil from pit on completion of work. (v) Contractor has to submit test report of earthing after completing the earthing. (vi) Bentonite clay should be Conf to IS 6186: 1986

Materials and labour for earthing complete with galvanised iron earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly and preferably vertically 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 m below ground level connetced with galvanised iron strip 32 x 6 mm by means of nuts, bolts, check nuts and washers made of galvanised iron or steel earthing lead to be protected by galvanised iron pipe of 40mm bore (light grade) and other end connected to earthing test point or lightening arrestor or main controlling switch as directed including providing funnel with 20mm bore galvanised iron pipe (medium grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) all round the earth electrode, concrete earth pit in PCC (1:3:6) type C-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:2:4) cover slab (re-inforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) including necessary earth work in excavation, returning filling and removal of surplus earth upto a distance not exceeding 50 m etc all as shown on electrical plate No. 3 of MES Schedule Part-I(2009) complete including testing on completion all as specified and as directed.

Supply and fixing maintenance free chemical earthing of UL Listed Copper bonded Solid Steel Rods are to be used as vertical electrode. These electrodes shall be made of high tensile low carbon steel rod, molecular bonded with 99.9% electrolytic copper with minimum bonding thickness of 254 microns - 25 mm dia copper bonded rod with minimum length of 3048 mm (10 ft as per UL) and as per IEC 62561-2. Universal clamp of required size should be made up of SS304. Polypropelene Earth pit chamber of size 300x300x190mm. Earth enhancement compund of resistivity 0.018 ohm meter - 25kg should be used made graphite and carbon should be of conductive concrete based mineral compound producing low resistance of an earth termination system. The job includes boring of 100 mm dia bore up to 3.2 mtr depth in any type of strata/ soil for placing/ lowering the pipe in pipe electrode. Material of the earthing enhancing compound shall be chemically inert to subsoil. It shall not pollute the environment. Below test report should be submitted for Earth rod should be tested CPRI tested for 87.5 kA Ipeak and 35 kA Irms for 1 sec and test reports for Marking, Dimension, Electrical resistance before and after salt mist test, tensile strength, bend test , adhesion test. The compound shall be tested and certified as per IEC 62561-7 and also fulfill Toxicity Characteristic Leaching Procedure (TCLP) requirements complete all as specified and as directed. Make: CAPE or equivalent

Note : (a) The job includes excavation of pit in any type of hard dense soil/ disinterigated rocky strata (b) The job also include M & L for in PCC(1:2:4) type B1 around the FRP cover for support and foundation and colouring the PCC work with desired colour.

Material & labour for Advance encapsulated compound based Chemical earthing CPRI tesed maintenance free , pipein -pipe technology upgraded (Zinc & Alloy coated). , Zinc & Alloy coated (80 -100) microns with pure zinc (99.9%) & Alloy coating (200-250) microns. Earthing system conforming IS 3034. The outer and inner pipe should be 76.2 mm and 41.9 mm dia respectively of 3 mtrs long zinc coated with additional special alloy coating 300mm on top side for additional protection of the terminal . The annular space between the pipes to be filled up with Compact fill (CF) (Crystalline Conductive) mixture which should be machine pressed in the pipes not disintegrate or collapse when outer pipe corrodes . The inner pipe should be extended with terminals for connectivity.The job includes boring of 300 mm dia bore up to 4.0 mtr depth in any type of strata/ soil for placing/ lowering the pipe in pipe electrode , filling of pure conductolite back filling compound (BFC Conductolite ) having excellent moisture retaining capacity in 300 mm bore all around the electrode min 4 bags of 25 KG per pit per unit.The earth pit should be provided with a FRP earth pit cover for protection and safe guard of terminals. The material of earth electrode should have good electrical conductivity & anti corrosion property in wide range of soil conditions. The job also include M & L for in PCC(1:3:6) type C-1 around the FRP cover for support and foundation and colouring the PCC work with desired colour.complete all as specified and directed. Make : ASHLOK ( Model ASEEL-39 AC 3 mtr length 76.2 mm dia)

Material & labour for Advance encapsulated compound based Chemical earthing CPRI tesed maintenance free , pipein -pipe technology upgraded (Zinc & Alloy coated). , Zinc & Alloy coated (80 -100) microns with pure zinc (99.9%) & Alloy coating (200-250) microns. Earthing system conforming IS 3034. The outer and inner pipe should be 76.2 mm and 41.9 mm dia respectively of 3 mtrs long zinc coated with additional special alloy coating 300mm on top side for additional protection of the terminal . The annular space between the pipes to be filled up with Compact fill (CF) (Crystalline Conductive) mixture which should be machine pressed in the pipes not disintegrate or collapse when outer pipe corrodes . The inner pipe should be extended with terminals for connectivity.The job includes excavation of pit in any type of hard dense soil/ disinterigated rocky strata of size 1000 mm x 1000 mm x 3050 mm depth and taking out all excavated soil, lowering and placing copper electrode in centre of pit , filling of pure conductolite back filling compound (BFC Conductolite ) having excellent moisture retaining capacity in 300 mm bore all around the electrode min 4 bags of 25 KG per pit per unit.The earth pit should be provided with a FRP earth pit cover for protection and safe guard of terminals. The material of earth electrode should have good electrical conductivity & anti corrosion property in wide range of soil conditions. The job also include M & L for in PCC(1:3:6) type C-1 around the FRP cover for support and foundation and colouring the PCC work with desired colour.complete all as specified and directed. Make : ASHLOK ( Model ASEEL-39 AC 3 mtr length 76.2 mm dia

Taking out old GI/aluminium/copper earth strip or relaying/ refixing the same existing strip with fastners of any size and type in any height and any location as directed by Engineer In charge.

Supply and fixing copper strip of size 20 x 3 mm as earth continuity conductor or main earthing lead fixed on "V" type porcelain insulator, 4 BM, heavy duty ( ceramic bus bar support insulator off white colour of suitable for mounting strip of 20 mm wide x 3 min thick) saddle to wall, buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 20 x 3 mm copper strip brazing to each joints and connected with by providing brass nut bolts and washer all as specified and directed by Engr in Charge. Note : Insulators to be provided on every 50 cm. (Minimum 2 x insulators to be provided in every 1 x metre of strip)

Supply and fixing aluminium strip of size 25 x 3 mm as earth continuity conductor or main earthing lead fixed on "V" type porcelain insulators, 4 BM, heavy duty ( ceramic bus bar support insulator off white colour of suitable size for mounting strip of 20 mm wide x 3 min thick)) saddle to wall, buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required and connected with by providing brass nut bolts and washer all as specified and directed by Engr in Charge. Note : Insulators to be provided on every 50 cm. (Minimum 2 x insulators to be provided in every 1 x metre of strip)

Supply and fixing copper strip of size 32 x 6 mm as earth continuity conductor or main earthing lead fixed on "V" type porcelain insulator 10 BM heavy duty ( ceramic bus bar support insulator off white colour of min size of 36 mm width x 60 mm length with 36 mm width bus bar mounting base) saddle to wall, buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 20 x 3 mm copper strip brazing to each joints and connected with by providing brass nut bolts and washer all as specified and directed by Engr in Charge.Note : Insulators to be provided on every 50 cm. (Minimum 2 x insulators to be provided in every 1 x metre of strip)

Supply and fixing Galvanised iron strip of size 32 x 6 mm as earth continuity conductor or main earthing lead fixed on "V" type porcelain insulator 10 BM heavy duty ( ceramic bus bar support insulator off white colour of min size of 36 mm width x 60 mm length with 36 mm width bus bar mounting base) saddle to wall, buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 20 x 3 mm copper strip brazing to each joints and connected with by providing brass nut bolts and washer all as specified and directed by Engr in Charge.Note : Insulators to be provided on every 50 cm. (Minimum 2 x insulators to be provided in every 1 x metre of strip)

Refixing of existing serviceable copper / aluminium / GI strip taken out under item No. 7 above, on top of "V" type procelain insulator ( ceramic bus bar support insulator off white colour of suitable size for mounting of insulator) fixing strip on insulator with brass nuts and bolt ,screws, aluminium cleats etc.( Procelain insulator if replaced shall be measured separetly) duly straightened properly and fixing in neat dressed manner as directed by Engineer in charge. Note: (i) Proclelain insulator to be measured and paid seperately under relevant item

Material & labour for porcelin insulater 10 BM heavy duty (ceramic bus bar support insulator off white colour of min size of 50 mm width x 70 mm length with 50 mm width bus bar mounting base for fixing strip of width above 32 mm to 50 mm fixing on wall for supporting the copper strip including suitable size brass nuts and bolts, washers, drilling hole on wall to fix porcelain insulator , fixing insulator by providing steel screws etc complete all as specified and directed by Engineer-in-charge.( Note : Cost of brass nut bolt and washer and steel screw for fixing insulator is deemed to be included in unit rate of item).

Material & labour for porcelin insulater 4 BM heavy duty (ceramic bus bar support insulator off white colour of min size of 36 mm width x 60 mm length with 36 mm width bus bar mounting base for fixing strip of width up to 32 mm fixing on wall for supporting the copper strip of size 20 x 3 mm and up to 32 mm width including suitable size brass nuts and bolts, washers, drilling hole on wall to fix porcelain insulator , fixing insulator by providing steel screws etc complete all as specified and directed by Engineer-in-charge. ( Note : Cost of brass nut bolt and washer and steel screw for fixing insulator is deemed to be included in unit rate of item).

Material & labour for carrying out brazing work of copper earth strip joints, after removing the nut bolt, scraping and cleaning the strip surface all as specified by Engr-in-charge. Note : Size of earth strip is 20 x 3 mm to 32 x 6 mm

Supply & Fixing hexagonal head brass nut bolt and washer (Bolt size not less than 30 mm long from under side of head to end and not less than 6 mm dia) including taking out old rusted, corroded nut, bolt,washers as specified and directed by Engr-in -charge.

Supply & Fixing hexagonal head brass nut bolt and washer (Bolt size not less than 50 mm long from under side of head to end and not less than 7 mm dia) including taking out old rusted, corroded nut, bolt,washers as specified and directed by Engr-in -charge.

Taking down old broken and damaged earth pit chamber and M & L for construction of new earth pit chamber of brick work with plaster in outer and inner surface , copping of of PCC 1:2:4 Type A-1. Earth pit shall be of size 600 x 600 x 600 mm embedded in ground below GL 150 mm with openable PCC cover including GI funnel and wire mesh , including painting the complete pit all as specified and directed by Engineer-in-charge. Colour to be painted on complete pit to be obtain from Eng in Charge.

Supply & Fixing for thermoplastic(polycarbonate) junction box for test point without terminal block of dimension 182 x 180 x 111 mm IP 65 halogen free and weather proof including four hexagonal anticorrosive screws for out door installation complete all as specified and as directed. Make :Cape, Model - TK PS 1818-11 or equivalent.

Material & labour for Test point terminal block made of gun metal or phosphorus bronze size 75 x 75 x 25 mm drilled and screwed incl 3 Nos 8mm dia 25mm long hexagonal head screws for fixing strips to test point including necessary fixing arrangement to fix test point terminal block in junction box all as specified and directed.

Material & labour GI tubing light grade 40mm bore for fixing the air termination rods on top of pipe with necessary clamping arrangement .The GI pipe should embedded in PCC bed blocks and tied with Stainless steel wire rope for free stand alone of pipe compete all as directed. Note:- PCC bed blocks shall be measured and paid saperately under relevant item of this schedule.

Material & labour for PCC (1:2:4), type B-1 (using 20 mm graded stone aggregate) for foundation for pole mass concrete/Block etc including demolition complete all as specified and directed.

Material & labour Air termination, single pointed, copper rod 12mm dia and 300 mm long complete fixed on wall/roof including fixing arrangement all as specified and directed..

Material & labour in repair Air termination, single pointed, aluminium rod 12mm dia and 300mm long complete fixed on wall/roof including fixing arrangement all as specified and directed..

Supply and fixing stainless steel wire rope PVC insulated of minimum thickness 6 mm for holding GI pipe of 50/ 40 mm dia to stand straight vertical mounted with lightening arrester spike complete all specified and directed by Engineer -in-charge

Supply and fixing stainless steel wire rope clamp grip for rope clamping 'U' with nut bolts washer etc all as specified and directed by Engineer -in-charge

Supply & laying of HDPE pipe of pressure rating 6 kgf/sq.cm of size 25 mm dia for protection of copper earth strips complete all as specified and directed by Engineer -in-charge

Material & labour PVC insulated, Single core flexible copper conductor cable, 1100 Volt, Conf to IS 694, ISI marked of size 70 Sqmm including fixing it on tower of 40 mtr height by providing GI strip clamp and also by using Heavy duty PVC tye from LA at top of tower to earthing pit on ground, and any other locations like on wall or laying on floor by providing saddles, including connecting terminals by providing copper lugs, brass nut and bolt with washer of suitable size as per site requirement to connect the cable complete all as specified and directed by Engineer in Charge.

Supply and fixing Brass Copper lightening arrester 9.2 mm diameter and 915 mm in length with 5 spikes and base plate 8.5 x 8.5 cm for building protection coverage of 45 degress from the top point 1.85 m all as specified and directed by Engineer in Charge.

Supply & fixing ESE LA (Early streamer emission lightning arrester) with 79 meter radius at 5 meter height with level 1 protection level as per NFC 17 192 : 2011 complete all as specified and as directed. Make - True Power ATS TP-3 or equivalent. Note : CPRI type test certificate to be provided along with material, installation is to be done through OEM representative.

Supply & fixing GI Mast of size 50 mm dia with guy wire of 5 meter length along with all accessories like clamps, saddles, holding arrangements to fix the mast to the shed/structure at highest point such that the Air terminal is 5 meters above the tallest structure is installed as per site requirement complete all as specified and as directed.

Supply & fixing Analog Lightnng counter 6 digit complete all as specified and as directed.

Supply & fixing test link bar with insulator and nut bolt complete all as specified and as directed.

Material & labour for fabrication of display board for earth pit nos, lacation and periodical test results for power circuit earthing, machinary earthing ,lightening conductor earthing, made of MS sheet 3.0 mm thick sheet, rectangular welding on angle iron of 25 x25 x4 mm of 600 mm height from ground level 30 cm including fixing in PCC 1:2:4 with 20 cm X 20 cm X 20 cm (below ground level) grade aggregate foundation to be carried out at different location technical area/domestic area . Dimention of board shall be 30 cm X 25 cm. or any other dimention not more than 0.075 sq mtr of MS Board The instruction shall be written black painted board in white letters not less than 2 " size for all type of boards complete all as specified and dierected by the Engineer -in-charge including taking down unsv one. Note : (a) All necessary MS sheet, aluminium screws and PCC works etc are deemed to the rate quoted by the contractor (b) The matter to be write on board should be collected from Engineer-in-charge.

Supply and fixing Surge protection device (SPD) Type 1+2 AC 4P (4 pole) Imax 40KA including suitable enclosure and installation in parallel connection in DB and making all electrical connection with 4 x 6 sqmm single core copper wire with copper lugs as required at site complete all as specified and as directed. Make- Hager, Cat No. SSPL440

Supply and fixing Surge protection device (SPD) Type 1+2 AC 2P (2 pole) Imax 20KA including suitable enclosure and installation in parallel connection in DB and making all electrical connection with 2 x 6 sqmm single core copper wire with copper lugs complete all as specified and as directed. Make- Hager, Cat No. SSPL220

Note : For BOQ item No 2.01, 4.01, 5.00 and 6.00 It must be noted by the bidder that for the BOQ items mentioned here, the earthing resistance value should be less than 2 Ohms. If earthing value exceeds more than 2 Ohms, the copper strip will either be replaced by new one or the acting value must be brought below 2 Ohms by any means as deemed fit and technically correct with the approval of Engineer-in-Charge by the Contractor and the same will be deemed inclusive in the quoted rates.

M/S ELECTROVISION (BID ID -3498172)

Guru Charan Mahata (BID ID -3494649)

M/S Tapan Sur (BID ID -3498883)