REPAIR / MAINT OF EXISTING EARTHING AND RENEWAL/ MONTHLY CHECKING OF EARTH RESISTANCE OF EARTHING PITS AND MAINT OF ROOF TOP LIGHTNING PROTECTION SYSTEM/ LIGHTING ARRESTOR AT 11 BRD AF STN OJHAR UNDER GE (AF) OJHAR

M&L for carrying out physical inspection, testing and measurement of individual earth pit resistance of each earth pit, once every month, located in the Tech Area, Domestic Area, Raksh Nagar and MES installations, including all associated areas of the station.The work shall include measurement of resistance of each individual earth electrode/pit associated with the LV distribution system and other non-DG/non-transformer installations by the Fall-of-Potential (Earth Tester) method. Where the Fall-of-Potential method is not feasible due to site constraints, measurement shall be carried out by the Stake-less method using suitable current and voltage clamps, as instructed by the Engineer-in-Charge. The entire said area covers approximately 630 Nos. or more earth pits/earth electrodes located at various areas of the station. 100% of the identified earth pits shall be physically inspected, tested and measured every month, or such number as specifically directed by the Engineer-in-Charge & as per . The scope shall include, but shall not be limited to: (a) Physical inspection of each earth pit/electrode and its associated earthing arrangement. (b) Measurement and recording of individual earth resistance of each earth pit/electrode every month. Necessary excavation of earth pits in any type of soil and removal/breaking of hardstanding, concrete, paving, etc., wherever required for insertion of test spikes/electrodes, complete in all respects. (c) Measurement of earth resistance of all types of earthing systems, including conventional and chemical earthing, strip or wire electrodes of any size/type, complete. (d) Use of suitable, calibrated and duly certified earth resistance testing equipment, with valid calibration certificates issued by an appropriate Government/competent authority or NABL-accredited laboratory, as applicable. (e) Testing shall be carried out in the presence of the JE E/M or his representative & the recorded readings shall be got duly signed by the Engineer-in-charge & User's representative, along with satisfactory working remarks, as acknowledgement of the inspection/testing. (f) The Contractor shall maintain proper month-wise records/registers containing, as a minimum, the earth pit identification number/location, date of testing, test method adopted, measured resistance value, condition of the earth pit/electrode, observations and remarks. (g) The test results/records shall be submitted to the AGE E/M Office on a daily basis for the earth pits tested on that day. The complete month-wise consolidated record for 100% of the earth pits tested shall also be submitted as directed by the Engineer-in-Charge. (h) The Contractor shall achieve a minimum testing rate of 22 Nos. earth pits per working day and shall ensure testing/inspection of 100% of the identified earth pits within each calendar month. (i) The quoted rate is deemed to include all necessary tools, tackles, testing instruments, test leads, spikes/electrodes, clamps, labour, transportation, excavation, reinstatement and other incidental requirements necessary for satisfactory completion of the work shall be deemed included in the quoted rate. (j) In case of any defective, damaged or inaccessible earth pit cover/earth electrode connection noticed during inspection shall be immediately brought to the notice of the Engineer-in-Charge / JE E&M with suitable remarks in the inspection record. (k) The work shall be carried out complete in all respects as per IE Standard rules & to the entire satisfaction of Engineer-in-charge

Repair of old earthing for improvement of earth resistance by removing of old pit Chameber from existing site , disconnecting all earth electrode of any type and size from excavated the pit and removing old existing any type & size of earth plate , cleaning the same and burried the same directly in ground with new bolts,nuts ,washer and check nut of galvanized steel of existing size or as ordered ,filling the pit with adequate quantity of charcol and common salt in alternate layer of 15cm 3ft x 3ft thick all around the electrode including necessery excavation & earth work in any type of soil complete & finally testing on completion to the entire satisfaction of Engineer-in-charge .( Note:- The quoted rate is inclusive for labour filling of the charcoal , salt , , urea etc & the said materials used for filling shall be measured as "SUPPLY ONLY" under relevant items here-in-below

Supply only Salt

Supply only Char coal

Supply only Magnesium sulphate

Supply only Back fill compound (SGI Engineer or equvalent Terec 12.5 kg and Earthcon Compound 5 kg ) or Ashlok or Duval Mession as approved.

Supply only Wire mesh funnel

M&L for removing/opening the existing top cover of the earth pit located in any description for thoroughly cleaning the earth pit internally and externally, removing all dirt, debris, loose material, vegetation and other foreign matter, and thereafter filling the earth pit with clean salty water as required for proper maintenance/treatment of the earthing arrangement & finally the existing top cover shall be properly refixed/reinstated in its original position after completion of the work, complete all as directed. (Note: The quoted rate shall be inclusive of all necessary tools & plants (T&P), labour, water tanker/bowser, water, pipes, hoses, buckets, cleaning materials, transportation and all other tools, equipment, consumables and incidental works required for satisfactory completion of the work. No extra payment shall be admissible on this account).

Supply and fixing of Earth Continuity Conductor/Main Earthing Lead of 4 mm dia galvanised iron (GI) or galvanised steel wire, including roof conductor/down conductor, above ground level or at any other location as required. The conductor shall be securely fixed to walls, roofs, structures, poles or other surfaces, duly insulated and supported on suitable battens, or fixed on new porcelain insulators with suitable clamping arrangements to the entire satisfaction of Engineer-in-charge. The work shall also include laying/fixing of the conductor in recessed chases, embedded/buried in ground or floor, drawn through suitable conduit/pipe, fixed to poles/supports, or installed by any other suitable method required for loop earthing, earth continuity or connection to the earthing system, complete in all respects as directed by the Engineer-in-Charge.

All as per item No 9 here-in-above but 25 x 4 mm size galvanised iron strip -do- .