IEC TR 62271-307:2015 : Title: High-voltage switchgear and controlgear - Part 307: Guidance for the extension of validity of type tests of AC metal and solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV Pages: 97 Year: Publisher: IEC Availability: Within 1-2 working days
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