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| 1 | Checking/testing of Earth resistance value of earthing pits Installed inside Darjipura, Makarpura, Harni camp and Harni airfield area as required basis as directed by Engr in Charge or as scheduled and making the damaged earthing serviceable by pouring salted water into earthing or making continuity by GI strips and bringing down the resistance value within specified limits. including maintenance of existing earthing by cleaning the earth chamber funnel and cleaning of vegetation surrounding earthing pit up to 2 metres.Note: (i) The entire station will be divided into two zones as per earthing location and the contractor shall deploy separate team for each zone to test the resistance value of earthings in each zone to complete the process within one month. The entire process will be repeated after every three months upto completion of the contract. (ii) One earthing testing in one season ie is measured as one job.(iii) Digital Earth tester will be arranged by the contractor on his own without extra cost to Govt. (iv) Date of testing and due date of testing will be written on the register with sign of user rep & Engr-in Charge shall be submitted to GE. (iv) Testing and corrective action shall be taken within one month from date of commencement i.e. approx 200 earthings shall be completed within one month. Thereafter or as directed by Engr-in Charge and same is to be completed within one month.The contractor shall be deployed requisite electricians with helper including testing equipment and all the resources to complete the task within one month.(v) If any material required for improvement of resistance value of earthing pit the same will be measured and paid separately under relevant items. |
| 2 | Taking out old damaged lightning protection strip strip aluminium /Copper /GI earthing strip of size 25mmx3.15mm to 32 x6mm fixed from roof of building,pillars, walls etc along with broken insulator and refixing the same on roof, pillars, walls etc. complete all as specified and directed. Note:- (i) New epoxy insulator shall be measured and paid separately(ii) The strip shall not touch with the wall/ roof surface /pillar surfaces etc. |
| 3 | Supply & fix in repair epoxy earth strip insulator size 25 mmx 3 mm weather proof, heat proof including base screw complete |
| 4 | Supply & fix in repair epoxy earth strip insulator size 32mmx6mm including brass base screw complete |
| 5 | S&F in repair Aluminium strip 25mm x 3.15 mm complete with new porcelain insulator by means of screws of suitable size for isolation of strip complete all as specified and directed |
| 6 | S&F in repair Copper strip 20mm x 3.15 mm complete with new porcelain insulator by means of screws of suitable size for isolation of strip complete as all as specified and directed |
| 7 | S&F in repair Single pointed aluminium rod 12 mm dia and 300 mm long fixed on the roof including all fittings, fixtures and PCC 1:2:4 type B-1 blocks 100mm x 100mm x 100mm complete as all as specified and directed |
| 8 | S&F in repair GI strip 32 x 6 mm buried in ground after testing point complete all as specified and directed |
| 9 | S & F in repair Test point box terminal made gun metal phosphorus bronze of size 75 x 75 x 25 mm drilled and screwed including 3 Nos. 8mm dia hex Head and polycarbonate junction box corrosion free 130mmx130mmx100mm weather proof and 2 Nos busbar insulator, nut,bolt and washer appropriate size complete as all as specified & directed. |
| 10 | Taking out old damaged GI earthing plate complete all as specified and directed. |
| 11 | M&L for Earthing complete with galvanised steel earth plate electrode 60cm x 60cm x 6mm thick buried directly in ground (Earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level, connected to galvanised earth lead 32x6mm GI strip upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel providing alternate layer of charcoal dust and salt providing alternate layer of charcoal and salt all as shown in electrical plate No.3 of SSR Part-1 and connected to test point including necessary excavation/ earth work in any type of soil/rock strata, Construction of earth pit with PCC 1:2:4 type B1 as per electrical plate No 3 of SSR-I including CI frame and CI cover 10mm thick of size 300mmx300mm funnel with wire mesh and GI watering pipe 20 mm dia bore (medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completion including GI protection pipe 40mm dia medium grade for earthing lead complete all as specified and directed .Note : Earth strip and protection pipe up to 7.5 Mtr and excavation is deemed to be included with unit rate of item. |
| 12 | Taking out old unserviceable copper earthing of any description complete all as specified and directed by Engr-in-Charge. |
| 13 | M&L for Earthing complete with copper earth plate electrode 60cm x 60cm x 3.15mm thick buried directly in ground (Earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level, connected to copper earth lead 20x3mm (copper strip) upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel including layer of BFC (Backfilling compund chemical), earth conductivity enhancing compound around both side 15cm thick layer and 15 cm layer top and bottom ( Volume 90cmx 90cmx 30cm) all as shown in electrical plate No.3 of SSR Part I 2009 and as specified or indicated and testing on completion including excavation/earth work in any type of strata, PCC (1:3:6) type C1 earthing chamber, precast RCC slab 50 mm thick in reinforced cement concrete (1:2:4) type B1 reinforced with welded steel wire fabric XPM jali weight not less than 4 Kg/Sqm, cast iron frame, funnel with wire mesh,15 mm bore medium grade GI watering pipe, lugs, 25 mm bore medium grade GI protection pipe, test point etc. complete all as specified and directed.Note: (i) Item includes the cost of earth strip, GI pipe up to 7.5 metre for protection of earth lead and necessary excavation, filling in & removal complete. |
| 14 | Taking out old unserviceable chemical earthing of any description complete all as specified and directed by Engr-in-Charge. |
| 15 | Supply and instalation & testing of tripod (SET OF 3) of fast copper earth electrode maintenance free chemical earthing inter connected (distance between the earth 1.5Mtr from each other) with copper earth strip 32x6mm and making tripode each earthing having 3 mtr long copper pipe of diameter 76 mm. There should be terminal for connection of 20 x 3 mm of copper strip with two holes of 14 mm diameter. FAST ELECTRODE is duly fitted with the highly conductive material with sealing at both ends with lead terminals of 20x3 mm copper strip at top, BFC (Backfilling compund chemical), earth conductivity enhancing compound alongwith Minimum 6 bags of 25 Kgs each of earth enhancing compound, including drilling a bore in earth of dia minimum 300 mm dia. The chemical should be tested and certified by any international accredited laboratory. The earthhencing compound should be tested referring to protocol IS 1350/&/EC62321/111/54/CDV. The PH value of compound should be between 7 to 8. The content of mercury (Hg) & Hexacromium should be below detection level. The electrode should be tested for salt spray test as per BIS117-09 for corrosion for minimum 500Hrs. The FAST ELECTRODE shall be duly tested & Certified by CPRI (Central Power Research Institute), Govt of India for a suitable minimum short circuit current for 1 second with initial pick of suitable KA. The Fast ELECTRODE shall be approved by CPRI, ERDA/NABL Lab complete all as specified and directed.Note : Earth strip size 20mmx 3mm for making tripod and up to 5 Mtr from earthing set is deemed to be included with unit rate of item beyond 5 mtr earth strip will be measured and paid separately. Please Enable Macros to View BoQ information |
| 16 | Supply and instalation & testing of tripod (SET OF 3) of fast copper earth electrode maintenance free chemical earthing inter connected (distance between the earth 1.5Mtr from each other) with copper earth strip 32x6mm and making tripode each earthing having 3 mtr long copper pipe of diameter 76 mm. There should be terminal for connection of 20 x 3 mm of copper strip with two holes of 14 mm diameter. FAST ELECTRODE is duly fitted with the highly conductive material with sealing at both ends with lead terminals of 20x3 mm copper strip at top, BFC (Backfilling compund chemical), earth conductivity enhancing compound alongwith Minimum 6 bags of 25 Kgs each of earth enhancing compound, including drilling a bore in earth of dia minimum 300 mm dia. The chemical should be tested and certified by any international accredited laboratory. The earthhencing compound should be tested referring to protocol IS 1350/&/EC62321/111/54/CDV. The PH value of compound should be between 7 to 8. The content of mercury (Hg) & Hexacromium should be below detection level. The electrode should be tested for salt spray test as per BIS117-09 for corrosion for minimum 500Hrs. The FAST ELECTRODE shall be duly tested & Certified by CPRI (Central Power Research Institute), Govt of India for a suitable minimum short circuit current for 1 second with initial pick of suitable KA. The Fast ELECTRODE shall be approved by CPRI, ERDA/NABL Lab complete all as specified and directed.Note : Earth strip size 20mmx 3mm for making tripod and up to 5 Mtr from earthing set is deemed to be included with unit rate of item beyond 5 mtr earth strip will be measured and paid separately. Please Enable Macros to View BoQ information |
