BS 6436 – Specification for ground mounted distribution transformers for cable box or unit substation connection
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.