IEC 61236-2-4:2012 specifies detailed test configurations, operational conditions and performance criteria for equipment for insulation monitoring according to IEC 61557-8 and insulation fault location according to IEC 61557-9. This applies to insulation monitoring devices and insulation fault location systems permanently or semi-permanently connected to the distribution system. This second edition cancels and replaces the first edition published in 2006 and constitutes a technical revision. It includes the following significant technical change: update of the document with respect to IEC 61326-1:2012. This publication is to be read in conjunction with IEC 61326-1:2012.