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There are two definitions used in IEC “Gas‐Insulated Switchgear” and IEEE “Gas‐Insulated Substations.” The reason for this, different names for GIS has an historical background, where IEC started in SC 17A to develop circuit breaker standards and later started a new subcommittee SC 17C on high‐voltage switchgear assemblies, so the link was made to switchgear. In IEEE, the substation committee developed standards on GIS in the substation subcommittee, so the link of GIS was taken to substations.

 In IEEE C37.122, GIS is defined as follows:Gas‐insulated switchgear (GIS): a compact, multicomponent switchgear assembly, enclosed in a grounded metallic housing in which the primary insulating medium is gas, typically SF6 and which normally includes buses, switches, circuit breakers, and other associated equipment. Also commonly known as gas‐insulated switchgear.Gas‐insulated switchgear enclosure: A grounded part of gas‐insulated metal‐enclosed switchgear assembly retaining the insulating gas under the prescribed conditions necessary to maintain the required insulation level, protecting the equipment against external influences and providing a high degree of protection from approach to live energized parts.Compartment (GIS): A section of a gas‐insulated switchgear assembly that is enclosed, except for openings necessary for interconnection providing insulating gas isolation from other compartments. A compartment may be designated by the main components in it, e.g., circuit breaker compartment, disconnect switch compartment, bus compartment, etc.Partition: Part of an assembly separating one compartment from other compartments. It provides gas isolation and support for the conductor (gas barrier insulator).Power kinematic chain: Mechanical connecting system from and including the operating mechanism up to and including the moving contacts.

 In IEC 62271‐203, GIS is defined as follows:Metal‐enclosed switchgear and controlgear: switchgear and controlgear assemblies with an external metal enclosure intended to be earthed, and complete except for external connections.Gas‐insulated metal‐enclosed switchgear: metal‐enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas other than air at atmospheric pressure.Gas‐insulated switchgear enclosure: part of gas‐insulated metal‐enclosed switchgear retaining the insulating gas under the pre‐scribed conditions necessary to maintain safely the highest insulation level, protecting the equipment against external influences and providing a high degree of protection to personnel.Compartment: part of gas‐insulated metal‐enclosed switchgear, totally enclosed, except for openings necessary for interconnection and control.Support insulator: internal insulator supporting one or more conductors.Partition: support insulator of gas‐insulated metal‐enclosed switchgear separating one compartment from other compartments.

Note 1 to entry: A compartment may be designated by the main component contained therein, e.g., circuit‐breaker compartment, bus bar compartment.