bids are invited for operation and maintenance of substation - complete system; manning the electrical substations in round-the-clock shifts and carrying out surveillance & operation of electrical equipment, attending to break downs if any, as per technical specifications. maintaining electrical equipment as per the approved check list & schedule for equipment listed in the technical specifications during general shift. maintaining electronic/ process instrumentation equipment/ instruments as per the approved check list & schedule for equipment listed in the technical specifications during general shift. semi-skilled technicians/ riggers maintaining roz stores items, spare management housekeeping etc. during general shift.; 1 power transformers 2 vacuum circuit breakers 3 air circuit breakers 4 motors & starters 5 feeders (mccbs /sfus) 6 emergency torch units 7 battery banks 8 mcc/pcc 9 pdbs 10 ldbs 11 general lighting-wiring, repairs & replacement 12 general cable laying.