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BS 7821-2.1:1995

Заменен
Three phase oil-immersed distribution transformers, 50 Hz, from 50 to 2500 kVA with highest voltage for equipment not exceeding 36 kV. Distribution transformers with cable boxes on the high voltage and/or low voltage side, General requirements — 16 стр.
BS 7821-2.1:1995
Заменен
BS EN 50464-2-1:2007
Заменен
BS EN 50588-2:2018
Действует