IEC TR 62271-307:2015
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
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This publication is to be read in conjunction with IEC 62271-200:2011 and IEC 62271-201:2014.