This document specifies requirements for prefabricated metal-enclosed traction switchgear for alternating current of traction voltages and frequencies as specified in EN 50163:2004 and used in indoor and outdoor installation. Enclosures may include fixed and removable components and may be filled with fluid (liquid or gas) to provide insulation. NOTE 1 EN 50163 specifies the AC traction systems 15 kV 16,7 Hz and 25 kV 50 Hz. NOTE 2 This document applies to single-phase or two-phase systems. For metal-enclosed traction switchgear containing gas-filled compartments, the design pressure is limited to a maximum of 300 kPa (relative pressure). NOTE 3 EN 62271-203 can be used as a guide for design and testing in case the design pressure of gas-filled compartments exceeds 300 kPa (relative pressure). Components contained in metal-enclosed traction switchgear are to be designed and tested in accordance with their various relevant standards. This document supplements the standards for the individual components regarding their installation in traction switchgear assemblies. This document 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 traction switchgear is to be taken into account. NOTE 4 Traction switchgear having an insulation enclosure are covered by EN 62271-201. For definition see there or IEV 441-12-06.