bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - work of maintenance of smoke detector at 220 kv substation deoria under etd deoria; work of maintenance of smoke detector at 220 kv substation deoria under etd deoria; s.. maintenance of smoke detector at 220 kv substation deoria under etd deoria vaccume cleaning of existing optical type smoke detectors installed inside control room, and other associated areas. the work includes the removal of smoke detector from its base and after cleaning of the detectors re-fixing of the smoke no. detector to the base along with keeping the connection of detector healthy including minor repairs of lugs/terminals etc. total quantity :