NIT-01(2021-22) item No.1

Dismantling & taking out ACB from LT panel by removing of defective parts of A.C.B., removing of all incoming & outgoing connection.

Air Circuit Breaker (ACB), 3 poles, 415V AC. Manual Draw out type, of rating 2000Amp, 50kA, and microprocessor based.(withoutBus coupler) Make:- L&T

Providing & Fixing of Under Voltage Trip Device (UVT) for above ACB. Make:- L&T

Providing & Fixing of Arcing Contact upper.

Providing & fixing of Jaw Contact.2000 Amp

Providing and fixing of current transformer 2000/5.

Providing & fixing of MCCB 3 pole with shut trip release with spreader & handle 630Amp. The work included making base frame for fitting of the MCCB in existing panel enclosure, door modification for setting of MCCB handle for proper ON/OFF operation. Make:- L&T

Providing & fixing by making panel door modification of existing panel complete with control wiring protection relays having sensitive earth fault, over current, S/C protection with following features- High set elements, highly immune to harmonics, both 1A & 5A CT input in one relay, 6 output contacts, non-volatile memory for trip indication, self- monitoring facility, status indication LED display & sealable front cover to prevent unauthorized access.

Cleaning of incoming & bus coupler ACB Bus bar Aluminum & insulation with heat shrinkable PVC sleeve/PVC tape throughout in red, yellow & blue color to identify three phases & black for neutral current carrying capacity 2000 Amp. The bus-bar support insulator made of non-deteriorating, vermin proof, non-hygroscopic materials such as SMC/DMC.

Providing/Fixing and making connection of bus bar of suitable size for 2000 Amp current carrying capacity including links, bends, aluminum bus bar will be of electrolytic grade 55% conductivity or as per relevant IS having sufficient cross section area insulated with heat shrinkable PVC sleeve in phase color identification. The bus bar support insulator shall be of class F insulation made out of non-hygroscopic material as SMC/DMC. All hardware for connection/joints shall be in high tensile.

Fixing of the ACB 2000 Amp in the existing LT Panel Board including providing & fabrication & fixing of the base frames of suitable sizes for ACBs in the chamber. Modification in panel door.

Servicing, overhauling of complete ACB 2000 Amp in 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 servicing of ACB with all incoming & outgoing cable connection with thimbling, setting of relay parameters for proper tripping in case of an fault.

Testing & commissioning of panel & allied accessories as per reuired parameters with relevant IS. Testing of the panel prior to switching on as continuity and earth testing, meggaring of all equipment for phase to phase, neutral to body, neutral to earth and phase to earth.

SS ENTERPRISES