1988IEC 60265-2:1988 High-voltage switches; part 2: high-voltage switches for rated voltage of 52 kV and above
IEC 60265-2:1988/AMD2:1998 High-voltage switches - Part 2: High-voltage switches for rated voltages of 52 kV and above; Amendment 2 was changed to IEC 62271-104:2009 High-voltage switchgear and controlgear - Part 104: Alternating current switches for rated voltages of 52 kV and above.