REPAIR MAINTENANCE OF DIFFERENT TYPE OF EARTHING INFRASTRUCTURE FOR TECHNICAL AND DOMESTIC AREA AND REPAIR MAINT AND SERVICING OF DG SETS AND ALLIED WORKS AT AF STN SALUA UNDER GE AF KALAIKUNDA

M&L for checking/testing of Earth resistance value of earthing pits Installed inside Air Force Station, Salua 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/copper strips and bringing down the resistance value within specified limits i.e. 1 Ohm. 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 is measured as one job. (iii) Digital Earth tester will be arranged by the contractor on his own. (iv) Date of testing and due date of testing will be written on the register with sign of user rep & Engr-in Charge is 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 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 of earthing pit the same will be measured and paid separately.

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 weather proof heat proof including base screw complete

Labour only for watering the existing earthing pits with salt 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 Air Force 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 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

M&L Brazing of earthing copper strips at various locations of size 20mm to 50mm width of thickness 3mm to 6mm by using oxygen and acetylene gas cylinder with copper rod material including removing of existing nut, bolt and insulator and refixng after brazing complete all as specified and directed Note :- 1. Any damage of building portion during working time will be repaired and made good deemed included in quoated rate of item. 2. Contractor shall be responsible to replace old wornout nut bolt and insulators with new material. cost of matrial also deemed included in quoated.

S&F PVC insulated 1 x 16 sqmm copper conductor single core (In green colour) including PVC rigid conduit dia 25mm and copper lugs use as earth continuity conductor complete as in repairs all as specified

Materials and Labour for provision of concrete earthing pit as shown on electrical plate No 3 of SSR Part –I (2009), in PCC (1:3:6) Type C1, pre-cast RCC (1:2:4) type B1 cover slab 54 cm x 54 cm x 5 cm reinforced with 8 mm dia. TMT bars @ 150 mm centre to centre both ways, with one handle for lifting made out of 8 mm dia. MS bar, including demolition of existing damaged earthing pit and including necessary earthwork in any type of soil, complete all as specified and directed.

Materials and Labour for Supply and installation & testing of fast copper bounded earth electrode maintenance free chemical earthing having 3 mtr long copper pipe of minimum diameter 76 mm. There should be terminal for connection of 20 mm 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 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 FAST ELECTRODE shall be dully tested & Certified by CPRI (Central Power Reserch 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 including pit cover light weight made out of high quality polymer with lid made of FRP, including nessary testings and commissioning, complete all as specified and as directed. Notes:- (i) The work of earthing shall be carried out by authorised trained rep of OEM.