European Committee for Electrotechnical Standardization（CENELEC）
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EN IEC 62271-104:2020
Scope
IEC 62271-104:2020 is applicable to three-pole alternating current switches for rated voltages higher than 52 kV, having making and breaking current ratings, for indoor and outdoor installations, and for rated frequencies up to and including 60 Hz. This third edition replaces and cancels the second edition published in 2015. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - new numbering, following IEC 62271-1:2017.
EN IEC 62271-104:2020 history
2020EN IEC 62271-104:2020 High-voltage switchgear and controlgear - Part 104: Alternating current switches for rated voltages higher than 52 kV