IEC 61236-2-4 specifies detailed test configurations, operational conditions, and performance criteria for insulation monitoring devices according to IEC 61557-8 and insulation fault location systems according to IEC 61557-9. This standard applies to equipment permanently or semi-permanently connected to the distribution system. The second edition cancels and replaces the first edition from 2006 and includes significant technical updates, particularly aligning with IEC 61326-1:2012.