NIT NO. 29, ITEM NO.02(2021-22)WW-I

Air Circuit Breaker (ACB), 3Pole 415 V AC. Manual Draw out type, of rating 1600Amperes 50KaMake: L&T

Air Circuit Breaker (ACB), 3Pole 415 V AC. Manual Draw out type, of rating 800Amperes 50KaMake: L&T

Retrofitting of ACB (1600A,3 Pole) as above in place of existing panel by carring out following works:- 1) • Supply of necessary hardware, supports etc. 2) • Making /supply of M.S angle base frame/supports of size as suitable to the mounting of new ACB. Fixing of the same at the panel chamber with the help of nuts bolts /welding etc. as suitable for installation of new ACB /their cradles. 3) • Dismantling the existing circuit breaker from the chambers of the LT panel including its cradles and disconnecting the bus bar connections with the main bus bars, disconnecting the outgoing cables etc.. 4) Installation of new ACB cradle in the panel by the help of nuts bolts etc in proper alignment for connecting the bus bars. Fixing the ACB in the cradles in the proper condition including checking the movement. Making control wiring connection for the ACBs. 5) • Connecting the main bus bars to the incoming sides of the ACB by re-arrangement /modification/addition of bus bar lengths in Aluminum construction for retrofitting of ACB. 6) Connecting the bus bar at the outgoing side of the ACB by re-arrangement/ modification/addition of bus bar lengths in Aluminum for retrofitting of ACB. 7) • Testing of the ACB for ON –OFF operation first at NO load and then at ON load including operation, manual charging system etc

Retrofitting of ACB (800A,3 Pole) as above in place of existing panel by carring out following works:- 1) • Supply of necessary hardware, supports etc. 2) • Making /supply of M.S angle base frame/supports of size as suitable to the mounting of new ACB. Fixing of the same at the panel chamber with the help of nuts bolts /welding etc. as suitable for installation of new ACB /their cradles. 3) • Dismantling the existing circuit breaker from the chambers of the LT panel including its cradles and disconnecting the bus bar connections with the main bus bars, disconnecting the outgoing cables etc.. 4) Installation of new ACB cradle in the panel by the help of nuts bolts etc in proper alignment for connecting the bus bars. Fixing the ACB in the cradles in the proper condition including checking the movement. Making control wiring connection for the ACBs. 5) • Connecting the main bus bars to the incoming sides of the ACB by re-arrangement /modification/addition of bus bar lengths in Aluminum construction for retrofitting of ACB. 6) Connecting the bus bar at the outgoing side of the ACB by re-arrangement/ modification/addition of bus bar lengths in Aluminum for retrofitting of ACB. 7) • Testing of the ACB for ON –OFF operation first at NO load and then at ON load including operation, manual charging system etc

Providing fixing of indicting lamps Make: L&T

Providing & fixing of Under voltage trip device (UVT). Make: L&T

Replacement of panel door lock

Calibration of relay

Cleaning ofincoming & outgoing bus bar & complete panel horizontal bus bar Aluminum & insulation with heat shrinkable PVC sleeve/PVC tape throughout in red, yellow & blue color to identify three phases & black for neutral

Cleaning of panel, removal of old grease and re-greasing of all movable parts with recommended grease, setting of tripping mechanism,re-wiring of under voltage coil , complete overhauling of installed components with making all incoming & out going cable connection with thimbling.,

Testing & commissioning of ACB as per required parameters with relevant IS .testing of the panel prior to switching on as Continuity and earth testing ,Meggaring of all equipment’s for phase to phase, neutral to body, neutral to earth and phase to earth.

SS ENTERPRISES