This standard covers the design, testing, and installation of metal enclosed switchgear that incorporates gas (typically SF6) at higher than ambient pressure as an insulation medium for alternating-current applications above 1 kV to 52 kV. Contents of switchgear may include but are not limited to circuit breakers, switches, bushings, buses, instrument transformers, cable terminations, instrumentation, metering and controls, and protective relays. In a vertical section of the switchgear, some or all of the medium voltage compartment(s) shall be comprised of a gas pressure system for the primary insulating medium. This standard covers both indoor and outdoor installations. This standard covers switchgear using sealed pressure systems or closed pressure systems as defined in IEEE Std. C37.100.1 - 201X. Switchgear employing controlled pressure systems as defined in IEEE Std. C37.100.1 - 201X are not covered by this standard. This does not cover switchgear that is covered under C37.20.2, C37.20.3, or C37.74 that uses individual components that are gas insulated such as switches, circuit breakers and other equipment, nor does it fully cover these components which are covered by their individual component standards.
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