BS 109:1921

Air-break knife switches and air-break isolating switches for voltages not exceeding 660 volts excluding totally-enclosed and flame proof types.

NORMA vydaná dňa 30.1.1933

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The information about the standard:

Designation standards: BS 109:1921
Note: NEPLATNÁ
Publication date standards: 30.1.1933
Approximate weight : 300 g (0.66 lbs)
Country: British technical standard
Kategória: Technické normy BS