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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
Class/Status: Standard, valid
Released: 2025-11
VDE Art. No.: 0400713

This part of IEC 61557 specifies the requirements for insulation fault location systems which localize insulation faults in any part of the system in unearthed IT a.c. systems and unearthed IT a.c. systems with galvanically connected d.c. circuits having nominal voltages up to 1 000 V a.c., as well as in unearthed IT d.c. systems with voltages up to 1 500 V d.c., independent of the measuring principle.