Tender For Maintenance Of Various Type Of Earthling And Lightening Arrester At Various Locations Under Ge (Af) Marathahalli; 1 Taking down old unserviceable broken earth pit chamber andprovisionof inspection chamber by using precastRCC slab of external dimension 450 x 450 x75 mm with internal opening of 300 x 300 mmRCC 1:2:4 (type B1) using 20mm graded crushed stone aggregate reinforced with 8mm CTD bars at 10cms centre to centre both ways including finishing and precast RCC chamber in 1:2:4 type B1 of internal dimensions of 300x300x300mm height with 75 mm thick wall and includingprecast RCC 1:2:4 type B1 cover 50mm thick reinforced with 8mm CTD bars at 10cms centre to centre including one lifting handle including PCC sub base 1 : 4 : 8 , 100 mm thickall as specified and directed. Note:(i) Necessary excavation and removal are include in the quoted rate. (ii)The rate include disconnectingthe existingstrip / wire fromearth electrode and refixing the same with suitable bolts and washer. (iii)Weather coatingpaint will be done over chamber and inclusive in the above rate quoted .Make:Tirumala Earthing maintenance, Global earthing solutions 2 Taking down old unserviceable earth pit and M/Lforearthing complete with galvanized steel earth plate electrode 600X600X6mm thick buried directly in ground (earth pit not less than 2.25m deep below normal ground level) with top edge of the plate not less than 1.5M below normal ground level connected to GI earth strip 25 x 4 mm diaby means of nuts, bolts, check nuts and washer of GI steel and connecting to testing point including provision of test point and all as shown in electrical plate No. 3 of SSRPt I.The work is inclusive of necessary earth work and PCC chamber in RCC (1:2:4) Type B-1using 20mm crushed stone aggregate with 8 CTD bar reinforcement both ways at 140 mm centre to centre complete all as directed by Engr-in-Charge. Note:- (i) GIearth leadbeyond 7.5M shall be measured and paid separately. (ii) The rate include measuring earth resistance (iii)Weather coatingpaint will be done over chamber and inclusive in the above rate quoted .Make:Tirumala Earthing maintenance, Global earthing solutions 3 Taking down old unserviceable earth pit and M/Lforearthing complete with galvanized steel earth plate electrode 600X600X6mm thick buried directly in ground (earth pit not less than 2.25m deep below normal ground level) with top edge of the plate not less than 1.5M below normal ground level connected to GI earth strip 32 x 6 mm diaby means of nuts, bolts, check nuts and washer of GI steel and connecting to testing point including provision of test point and all as shown in electrical plate No. 3 of SSRPt I.The work is inclusive of necessary earth work and PCC chamber in RCC (1:2:4) Type B-1using 20mm crushed stone aggregate with 8 CTD bar reinforcement both ways at 140 mm centre to centre complete all as directed by Engr-in-Charge. Note:- (i) GIearth leadbeyond 7.5M shall be measured and paid separately. (ii) The rate include measuring earth resistance (iii)Weather coatingpaint will be done over chamber and inclusive in the above rate quoted .Make:Tirumala Earthing maintenance, Global earthing solutions 4 Taking down old earth pit and M/Lforearthing complete with Copperearth plate electrode 600 X 600 X 3. 15 mm thick buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of the plate not less than 1.5M below normal ground level connected to copperearth strip 20 x 3 mm thickby means of with brazing at jointsall as shown in electrical plate No. 3 of SSRPt I.The work is inclusive of necessary earth work and PCC chamber in type CI (1:2:4) with 8 CTD bar reinforcement both ways at 140 mm centre to centre complete all as directed . Notes:- (i) copper stripbeyond 7.5 M shall be measured and paid separately under relevant items of this schedule.(iii)Weather coatingpaint will be done over chamber and inclusive in the above rate quoted .Make:Tirumala Earthing maintenance, Global earthing solutions 5 Supply and fixing in repairGI earth strip of size 25x4 mm in ground not exceeding 40cm deep /fixing towall / structureincluding earthwork and necessary insulators, clamps, bolts, nuts etc., 6 Supply and fixing in repairPVC insulated cableof size 50 sqmm, 1100Volts grade with multistrand copper conductors all as specified and directed. 7 Taking down rusted GI wire and Supply & fixing GI earth wire 4.00 mm dia for interconnecting of earth electrodes all as specified. 8 Taking down damaged copper earth strip and Supply & fixing copper earth strip of size 20.0 x 3.0 mmwith saddles and fixing screws etc .for roof condutors and down conductors above ground levelall as specified. 9 Taking down old rusted tubing and Supply & laying in ground GI tubing light grade 40mm bore dia including necesary fittings for protecting earth continuity strip all as specified. 10 Taking down old rusted GI tubing and Supply & laying in ground GI tubing light grade 25mm bore dia including necessary fittings for protecting earth continuity strip. 11 Taking down perishedHigh density polyethylene (HDPE) pipe and supply & layingthe High density polyethylene (HDPE) pipe of50 mm bore complete including necessary fittings. 12 Cutting existing hard standing/flooring not exceeding600mm width x 600mmdepthall as specified as directed. 13 M & L for Cement concrete 1:3:6 type C-2 using 40mm graded stone aggregate in foundations, filling and mass concrete complete all as specified and directed. 14 Taking down perished /dishaped, horizontal / vertical aluminimum conductor of any size andMaterial & labourfor Aluminium strip 25 x3 size fixed to wallwith insulatorto over head tank / Storage shedor any other indicated situation all as specified and directed by Eng -in - charge .Note : The rate include Scaffloding ,/ Cradles etc . necessary for execution of work and protectivemeasures. 15 M & Lin replacement of Air termination , single pointed, aluminium rod 12mm dia and 300mm long in repairs all as specified. 16 M & L for Test pointterminalblock made of gun metal or phosphourus bronze size 75 x 75 x25 mm drilled and screwed including 3 Nos 8mm dia 25mm long hex, head screw in repairs all as specified. 17 Taking down old earthing and Material and labour for maintenance free ring earth consisting of four earth pits spacing of minimum 4 mts andusing copper -bonded steel rods, compression couplers earth enanching compound and exothermic welding for interconnecting the four earth pit electrodes. Each earth pit consists of 17.2mm copper bonded steel coredelectrodes 10ft long -04 Nos, Earth enhancing compound of 10 kg bag -16 Nos, 25mm x 2mm copper strip -16 mts , including inspection chamber of size 30cmx30cmcomplete all as specified and directed by Eng - in- Charge. Note :(1) On testing after completion of Job , if desired earth resistence (Less than1 Ohm )is not obtained , the earthing shall be redone by the contractor without any cost to Govt. (2) The chemical earthing will be done by the manufacturer or its authorised representative on the site. (3) This item includes the cost of 25mm x 5mm x300mm copper bus bar - 1 No. (4) This item includes the cost of 25mmx 25mm x 150mm bus bar- 1No (5)Earth conductor beyond 7.5 Mts shall be measured andpaid seprately. Make:Tirumala Earthing maintenance, Global earthing solutions 18 Taking down old earthing and Material and labour for maintenance free earth consisting of one earth pits using copper -bonded steel rods, compression couplers earth enanching compound and exothermic welding for connectingpit electrodes to strip . Each earth pit consists of 17.2mm copper bonded steel coredelectrodes 10ft long -01 Nos, Earth enhancing compound of 10 kg bag -5 Nos, 25mm x 2mm copper strip -7.5 mts , including inspection chamber of size 30cmx30cmcomplete all as specified and directed by Eng - in- Charge. Note :(1) On testing after completion of Job , if desired earth resistence (Less than1 Ohm )is not obtained , the earthing shall be redone by the contractor without any cost to Govt. (2) The chemical earthing will be done by the manufacturer or its authorised representative on the site. (3) This item includes the cost of 25mm x 5mm x300mm copper bus bar - 1 No. (4) This item includes the cost of 25mmx 25mm x 150mm bus bar- 1No (5)Earth conductor beyond 7.5 Mts shall be measured andpaid seprately. Make:Tirumala Earthing maintenance, Global earthing solutions 19 M&L to carry out earth resistance tests with the help of earth resistance tester digital/analog as per fall of potential meth. Mentioned in IS 3043and write the derived reading on the Earth Identification plate all as directed. 20 Taking down old board andS& F Display board (Earth pit marker) made out of25 mm angular frame with 45 cm height one side welded with 2mm thick MS sheet, frame work of size 15cmx15cm including excavation , PCC foundation and duly painted with redoxide & two coatsblack enamel paint with following letterdisplay with white paint earth pit marker.a) Earthing pit No:- b) Earthing resistance:- c) E-N volt:-d) Check done on:- e) Check due On:- 21 Taking down old uinserviceable Aviation light and S&F LED Aviation Obstruction light withand accessoriesall as specified and directed by Engineer-in-Charge.Make - Bajaj cat No BGAV 302 LED or equivalent in Havells/ Crompton 22 S&F Busbar supporting Insulator M10 Type for fixing of lightining arrestor connecting strip aluminium/ copper / GI strip on walls , building , roof of buildingfixing with screws and nut bolts all as per site requirement and all as directed by Emgr- In - Charge. 23 Earth work excavation in trenches not exceeding 1.5mwide andnot exceeding 1.5m in depth getting outin Soft/loose Soil and for laying of under ground cableand foundation of poles. 24 Returning, filling in, including spreading, levelling, watering and well ramming etc in layers not exceeding 25cm each in hard/dense soil. 25 Removing excavated materialto a distance n.exc 50m and depositing where directed at a level n.exc 1.5m above the starting point 26 Suply and filling commonSALT in earth pitsby removing soft soil to improve the earth resistense all as directed by Engr- In - Charge 27 Suply and filling Charcoalin earth pitsby removing soft soil to improve the earth resistense all as directed by Engr- In - Charge. 28 Surface dressing in hard / dense soil not eceeding 15 cm deep and clearing all the grass weeds etc in theearth pit surroundings after removing pcc pirt aside all as directed at site including setting complete all as directed at site all as directed by Engr- In - Charge. 29 Supply Digital Earth tester 4 terminal (0-2--200-2000)Ohms wacoDet 4100 Make Waco Complete all as specified and as directed by Engineer In Charge. 30 SITC of Early streaming Emission (ESE) lightning protection system ,NFC 17 -102:2011 complaint .Tested in ICMET high voltage laboratory ,protection radius 107 mtr at level -IV ESE air terminal of external wid area protection sysytem based on proactive early steamer emission (ESE ) technology ,ESE Terminal is capable to withstand current impulses of 40 KA (5 shots of 8/20 us wave shape ) .Ouer body capaturing rod which is made of non corrosive SS(XL 304) and having capturing rod dia of 25 mm ,to be mounted on existing roof of the E/M installation on PCC block of size 30 cm x 30 cm x30 cm having a bore of suitable size for inserting of 50 mm pipe complete all as specified and as directed .The lightening protection system should consists of following items with specifications .Make:Tirumala Earthing maintenance, Global earthing solutions 31 (A) Lighting Event Counter :Rate operating current from 1 KA to 100 KA (Max) in IP 65 Enclosure(B)Down Conductor :Single Core 70 sqmm PVC insulated flexible cable as per indian standards .(Polycab/Havells )(C)Advance Earthing Electrode (Maintenance free CPRI tested ):UL Listed 17.2 mm x 3 mtr length copper bonded 250 microns sold rod &advanced earthing compound 25 kgsx 2 bags & square polymer earth chamber .(D) GI Mast :GI mast of 5 mtr length ,60 mm rod ,coated with zinc with attached collar & base plate ,guy wires ,nut bolts etc.(E)Test Link Box :Supply of test link box of suitable size & dimension in poly carbonate explosure .(F) Note : Quoted rate should be inclusive of installation charges for lightening terminal ,mast & test link & digging ,insatallation & connection to earth pit for normal soil conditions .etc
