This standard covers the design, testing, and intallation of metal-enclosed switchgear that incorporates gas (typically SFJ at higher than ambient pressure as an insulation medium for alternating-current applications rated above I kV to 52 kV. The contents of the 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 composed of a gas pressure system for the primary insulating medium. This standard covers both indoor and outdoor installations.
