Describes requirements for prefabricated metal-enclosed Switchgear and controlgear for alternating current of rated voltages above 1 kV and up to and including 52 kV for indoor and outdoor installation, and for service frequencies up to and including 60 Hz.

This part of IEC62271 specifies requirements for prefabricated metal-enclosed switchgear and controlgear for alternating current of rated voltages above 1kV and up to and including 52kV for indoor and outdoor installation, and for service frequencies up to and including 60Hz. Enclosures may include fixed and removable components and may be filled with fluid (liquid or gas) to provide insulation. NOTE1 For the use of this document high-voltage ( IEC60050‑601:1985 , 601-01-27) is the rated voltage above 1000V. However, medium voltage ( IEC60050‑601:1985 , 601-01-28) is commonly used for distribution systems with voltages above 1kV and generally applied up to and including 52kV; refer to [1] of Bibliography NOTE2 Although primarily dedicated to three-phase systems, this standard can also be applied to single-phase or two-phase systems. This standard defines several categories of metal enclosed switchgear and controlgear which differ due to the consequences on network service continuity in case of maintenance on the switchgear and controlgear; the need and convenience of maintenance of the equipment. NOTE3 Safety of an installation results from the design, implementation and coordination of products, installations and operations. For metal-enclosed switchgear and controlgear containing gas-filled compartments, the design pressure is limited to a maximum of 300kPa (relative pressure). NOTE4 Gas-filled compartments having a design pressure exceeding 300kPa (relative pressure) should be designed and tested in accordance with IEC62271‑203 ; refer to [6] of Bibliography. Metal-enclosed switchgear and controlgear for special use, for example, in flammable atmospheres, in mines or on board ships, may be subject to additional requirements. Components contained in metal-enclosed switchgear and controlgear are to be designed and tested in accordance with their various relevant standards. This standard supplements the standards for the individual components regarding their installation in switchgear and controlgear assemblies. This standard does not preclude that other equipment may be included in the same enclosure. In such a case, any possible influence of that equipment on the switchgear and controlgear is to be taken into account. NOTE5 Switchgear and controlgear assemblies having an insulation enclosure are covered by IEC62271‑201 . NOTE6 Metal-enclosed switchgear and controlgear for rated voltages above 52kV insulated by ambient air may be covered by this standard taking into account the insulation levels of IEC62271‑1 .