"This part of IEC 62271 specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained@ at least partly@ by an insulating gas other than air at atmospheric pressure@ for alternating current of rated voltages above 52 kV@ for indoor and outdoor installation@ and for service frequencies up to and including 60 Hz. For the purpose of this standard@ the terms ""GIS"" and ""switchgear"" are used for ""gas-insulated metal-enclosed switchgear"". The gas-insulated metal-enclosed switchgear covered by this standard consists of individual components intended to be directly connected together and able to operate only in this manner. This standard completes and amends@ if necessary@ the various relevant standards applying to the individual components constituting GIS."