Gives principal characteristics, rating, terminal markings and construction of oil-filled three-phase two-winding transformers from 50 kVA to 2000 kVA and single-phase two-winding transformers from 16 kVA to 500 kVA for indoor or outdoor use connected by cable or directly to switchgear.Cross References:BS 148BS 171BS 171:Part 1BS 171:Part 4BS 2562BS 6056BS 6435