REPAIR REPLACEMENT MAINTENANCE OF CHEMICAL CONVENTIONAL EARTHING PITS AT AFS VADODARA

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.

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.

Supply & fix in repair epoxy earth strip insulator size 25 mmx 3 mm weather proof, heat proof including base screw complete

Supply & fix in repair epoxy earth strip insulator size 32mmx6mm including brass base screw complete

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

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

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

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

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.

Taking out old damaged GI earthing plate complete all as specified and directed.