This part of IEC 60669 applies to manually operated general purpose isolating switches with a rated voltage not exceeding 440 V and a rated current not exceeding 125 A, intended for household and similar fixed electrical installations, either indoors or outdoors.
GSO IEC 60669-2-4:2008 history
2008GSO IEC 60669-2-4:2008 Switches for household and similar fixed electrical installations Part 2-4: Particular requirements – isolating switches.