Historical
IEC 60265-2 Ed. 1.0 b:1988
High-voltage switches. Part 2: High-voltage switches for rated voltages of 52 kV and above
Applicable to three-phase alternating-current switches, having making and breaking current ratings, for indoor and outdoor installations, for rated voltages 52 kV and above, and for rated frequencies up to and including 60 Hz.
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International Electrotechnical Commission [iec]