procurement and installation of 245kv sf6 circuit breakers at 220 kv substation chamba, tehri garhwal , supply of245 kv sf6 circuit breaker 3-phase along with support structure including all necessary accessories e.g clamps, connectors,spares and gas filling kit including transportation,loading, unloading and f&i charges. , erection, testing and commissioning of new 245 kv sf6 circuit breaker 3-phase with support structure after safe shifting from store to worksite.work including all cable connections,ferruling, fabrication, jumpering and minor civil works required forproper erection & commissioning of cbs. (complete in all respect) , dismantling of existing old sf6 circuit breaker 3-phase along with air compressor assembly from structure in minimum possible time & safe shifting from that place to nearby store as per instruction of engineer in-charge.work including opening all cable connections, all labour and t&p required for proper completion of work.