High-voltage switchgear and controlgear - Internal arc classification for metal-enclosed pole-mounted switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV1 Scope This part of IEC 62271 specifies requirements for internal arc classification of metal enclosed pole mounted switchgear installations used for alternating current with rated voltages above 1 kV and up to and including 52 kV with service frequencies up to and including 60 Hz. This document is applicable to three phase, two phase and single phase equipment. Enclosures may include fixed and removable components and may be filled with fluid

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