IEC 61326-2-4:2020 is available as IEC 61326-2-4:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61326-2-4:2020 specifies more detailed test configurations, operational conditions and performance criteria than IEC 61326-1 for equipment for - insulation monitoring according to IEC 61557-8; - insulation fault location according to IEC 61557-9. This applies to insulation monitoring devices and for equipment for insulation fault location systems permanently or semi-permanently connected to the distribution system.