This part of IEC 62271 applies to a.c. switchgear and controlgear designed for indoor and
outdoor installation and for operation at service frequencies up to and including 60 Hz on
systems having voltages above 1 000 V.
This standard applies to all high-voltage switchgear and controlgear except as otherwise
specified in the relevant IEC standards for the particular type of switchgear and controlgear.
NOTE For the use of this standard, high voltage (see IEV 601-01-27) is the rated voltage above 1 000 V.
However, the term medium voltage (see IEV 601-01-28) is commonly used for distribution systems with voltages
above 1 kV and generally applied up to and including 52 kV.