REPAIR REPLACEMENT OF EARTHING AT AFS VADODARA

Amount

Checking/testing of Earth resistance value of earthing pits Installed inside Darjipura, Makarpura, harni camp and hari airfield area as requirement basis as directed by Engr in Charge or as schedule 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 mtr. Note: (i) The entire station will be divided into two zones as per earthing location and the contractor will 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 (half yearly) upto completion of the contract. (ii) one earthing testing in one season is measured one job. (iii) Digital Earth tester will be arrenge by the contractor his own. (iv) Date of testing and due date of testing is to be written on a register with sign of user rep & Engr-in Charge submitted to GE. (iv) Testing and correction action is to be done within one month from date of commencement i.e. approx 200 earthings is to be completed within one month. Thereafter on half yearly basis or as directed by Engr-in Charge and same is to be completed within one month.The contractor has to deploy electrician with helper and testing equipment and all the resources to complete the task within one month. (v) If any material required for improvement of resistance value which value is more than their permissible limit will be measured and paid separately.

Taking out old Aluminium /Copper /GI earthing strip of size 25mmx3.15mm to 32 x6mm. fixed on roof, pillars, walls etc. and Refixing the same including replacement of DMC/epoxy earth strip insulator/porcelain isolator having not less than 50mm height with screws and placed at an interval not less than 40cm 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.

Supply only epoxy earth strip insulator size 25 mmx 3 mm weather proof heat proof including base screw complete

Supply only epoxy earth strip insulator size 32mmx6mm including brass base screw complete

Supply only busbar insulator (saddle) porcelain 40mm dia x 20mm high x 12mm by replacement of old one with new insulator including drilling on any surface and fixing with suitable size of screw complete

S&F Aluminium strip 25mm x 3.15 mm complete with new porcelain insulator by means of screws of suitable size for isolation of strip in repairs complete all as specified and directed

S&F 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 in repair all as specified and directed

S&F 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 in repair of all as specified and directed

S&F Single pointed copper 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 in repair of all as specified and directed

S&F GI strip 32 x 6 mm buried in ground after testing point complete as in repairs all as specified

S&F Copper strip 32 x 6 mm buried in ground after testing point complete as in repairs all as specified

S & F Test point terminal made gun metal phosphorus bronze size 75 x 75 x 25 mm drilled and screwed including 3 Nos. 8mm dia long hex. Head screw and polycarbonate junction box corrosion free 130mmx130mmx100mm weather proof and 2 Nos busbar insulator, nut,bolt and washer of size not less than complete.

M&L Earthing complete with galvanised steel earth plate electrode 60 x 60cm x 6.0mm 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 wire 4.0 sqmm size upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel all including providing alternate layer of charcoal and salt 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 watering pipe 20 mm dia bore (GI medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 15 mm dia light grade for earthing lead complete all as specified and directed including taking out of old unserviceable earthing complete all as specified. Note : Earth strip and protection pipe up 7.5 Mtr is deemed to be included with unit rate of item.

M&L Earthing complete with galvanised steel earth plate electrode 60 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 providing alternate layer of charcoal 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 watering pipe 20 mm dia bore (medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 40mm dia medium grade for earthing lead complete all as specified and directed including taking out unserviceable earthing. Note : Earth strip and protection pipe up 7.5 Mtr is deemed to be included with unit rate of item.

M&L Earthing complete with galvanised steel earth plate electrode 60 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 25x4mm 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 providing alternate layer of charcoal 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, PCC 1:3:6 type C1 cement concrete 1:2:4 type B1 reinforced with welded steel wire fabric (AMP) not less than 4 KG per Sqm funnel with wire mesh and watering pipe 20 mm dia bore (medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 40mm dia medium grade for earthing lead complete all as specified and directed including taking out unserviceable earthing. Note : Earth strip and protection pipe up 7.5 Mtr is deemed to be included with unit rate of item.

M&L 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 compound chemical), earth conductivity enhancing compound around both side 15cm thick layer and 15 cm layer top and bottom ( Volume 90cmx 90 cm x 30cm) 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 watering pipe 20 mm dia bore (GI medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 25 mm dia(ID) medium grade for earthing lead complete all as specified and directed including demolition of old unserviceable earthing. Note : Earth strip and protection pipe up 7.5 Mtr is deemed to be included with unit rate of item

Supply and install & testing of fast copper earth electrode maintenance free chemical earthing of 3 mtr long copper pipe of diameter 76 mm. There should be terminal for connection of 20x3 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 compound chemical), earth conductivity enhancing compound along with Minimum 2 bags of 25 Kgs each of earth enhancing compound, including drilling a bore in eaarth of dia minimum 150mm dia. The chemical should be tested and certified by any international accredited laboratory. The earth enhancing 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) & hexavalent chromium 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 Institution), 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 : (i) The cost of copper strip 20mmx3mm and protection pipe 25mm dia (HDPE pipe) up to 5 mtr are deemed to be including with unit rate of item. (ii) PCC Earth pit and earth pit cover shall be measured and paid seperately under respective item of BOQ

Labour only for watering the existing earthing pits with salt and coal at Air Force Station Baroda as desired level at site all as specified and directed by Engr-in- Charge. Note:- (a) Contractor shall quote the rates by including the charges of making arrangement of watering the earthing pits at any site and location inside AirForce area. (b) Salt shall be paid separately in respective item in schedule.

Supply only salt suitable for earthing pit complete all as specified and directed.

M&L Construction of earth pit in in cement concrete PCC 1:2:4 Type B1using 20mm graded stone aggregate as per Plate No 3 specified in SSR Part I by using angle iron of size 40 x 40 x 3mm frame on top including earth work and cleaning the area/levelling & RCC cover of 1:2:4 type B-1 (using 20mm graded crushed stone aggregate) reinforced with 8mm dia TMT bars @ 75 C/C both ways and handle made of mild steel rod 12mm dia including provided new funnel with wire mesh complete as in repairs all as specified and directed.

S&F Earth pit CI cover 10mm thick of size 300mm x300mm with CI frame complete as in repairs all as specified and directed.

Preparation of new IDENTIFIER/MARKER made out of preferably metallic of size 30cm x 20cmx 2 mm thick metallic board fixed on MS Angle 30 X 30 X 5 mm of 450 mm long to be fixed to ground by means of cement concrete including painting with two coats of synthetic enamel paint over a coat of red oxide primer and writing the earth resistance complete and coloured with following colour chording to identify. a) For Chemical Earth pits -RED colour b) For conventional earth pits-YELLOW colour. Identification mark should be embossed on plate with following letters. c) LIGHTNING ARRESTER - LA (Oval shape) d) EQUIPMENT EARTH - EQ (Triangular shape) e) SIGNAL EARTH - SG (Dome shape) f) POWER SUPPLY EARTH- PS (Square shape) Height of the Identifier shall be 60cm above the ground level all as directed

M&L BFC (Back Filling Compound) chemical in 25 kg bag each, earth conductivity enhancing compound to level Chemical the existing chemical earth pit including taking out mud and other rubbishes from existing earth pit and cleaning complete as directed by Engr in Charge

Harsh Infrastructure

Rasam Engg Co.

Chanda Construction Co.

Gayatri Associates