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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