DIN EN IEC 61557-9
; VDE 0413-9:2025-11
Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 9: Equipment for insulation fault location in IT systems (IEC 61557-9:2023); German version EN IEC 61557-9:2025
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 9: Einrichtungen zur Isolationsfehlersuche in IT-Systemen (IEC 61557-9:2023); Deutsche Fassung EN IEC 61557-9:2025
Overview
This part of IEC 61557 specifies the requirements for the insulation fault location system (IFLS) that localizes insulation faults in any part of the system in unearthed IT AC systems and unearthed IT AC systems with galvanically connected DC circuits having nominal voltages up to 1 000 V AC, as well as in unearthed IT DC systems with voltages up to 1 500 V DC, independent of the measuring principle. IT systems are described in IEC 60364-4-41. Further information on insulation fault location can be found in the following International Standards: IEC 60364-4-41:2005, 411.6, and IEC 60364-4-41:2005/AMD1:2017, 411.6, and IEC 60364-5-53:2019/AMD1:2020, 531.3. This document deals with both passive IFLS and active IFLS. Active IFLS can be used in voltage-free systems. This document does not apply to insulation monitoring devices in accordance with IEC 61557-8.
Document: references other documents
Responsible national committee
DKE/UK 964.1 - Messgeräte zum Prüfen und Überwachen von Schutzmaßnahmen
