IS: 9921 (PART 1) - 1981; Specification for alternating current disconnectors(Isolators) and earthing switches for voltages above 1 000 V Part 1; general and definitions

IS: 9921 (PART 1) - 1981; Specification for alternating current disconnectors(Isolators) and earthing switches for voltages above 1 000 V Part 1; general and definitions - New Delhi BIS 1981 - 13p

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