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Metal‐enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas other than air at atmospheric pressure, as defined in IEC 62271‐203. This term generally applies to high‐voltage switchgear and controlgear. Three‐phase enclosed gas‐insulated switchgear applies to switchgear with the three phases enclosed in a common enclosure.

Single‐phase enclosed gas‐insulated switchgear applies to switchgear with each phase enclosed in a single independent enclosure.