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BS 7821-1:1995 Three phase oil-immersed distribution transformers, 50 Hz, from 50 to 2500 kVA with highest voltage for equipment not exceeding 36 kV. General requirements and requirements for transformers with highest voltage for equipment not exceeding 24 kV
standard by BSI Group, 09/15/1995
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Cross References: BS 171:Part 1*BS 171:Part 3*BS 7697*BS 7725*CENELEC HD 428.2*IEC 616*