Thispart of IEC62271 is applicable to a.c. series capacitorby-pass switches designed foroutdoorinstallation andfor operation at frequencies of 50 Hzand60Hzon systems having voltages above 52 kV.It isonly applicableto by-passswitchesfor use in three-phasesystems.This standardisalsoapplicableto the operating devices of by-pass switchesand to theirauxiliary equipment.