supply of distribution transformer 250 kvadistribution transformer 250 kva,supply of distribution transformer 250 kva, 3 phase 11 kv ,isi marked , 4 star rated, dyn-11 , core material: crgo as per is :3024 or latest, energy efficiency level-2, conductor winding material - copp er, insulation paper : kraft paper as per is: 9335 or latest, ground mounted outdoor type with standard fitti ng shall be provided with transformer as per ci.20.1 of is: 1180 (part-1):2014 amdt-1, type of cooling : on an , noise level : 45 in db, nominal system voltage 11 kv/415 volt 50 hz +/- 5 %, transformer to be supplie d with transformer oil, minimum warranty from the date of installation- 24 months. [ warranty period: 30 months after the date of delivery ] ]