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This part of 61557 specifies the requirements for the insulation fault location system (IFLS) which localizes 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 1000 V a.c., as well as in unearthed IT d.c. systems with voltages up to 1500 V d.c., independent of the measuring principle. IT systems are described in IEC 60364-4-41 amongst other literature. If the standards contain additional information for the selection of the devices, these should also be observed. Further information on insulation fault location can be found in the following standards: IEC 60364-4-41:2005, 411.6, and IEC 60364-5-53:2001, 531.3.
This document replaces DIN EN 61557-9:2009-11; VDE 0413-9:2009-11 .
This document has been corrected by: DIN EN 61557-9 Berichtigung 1:2017-05; VDE 0413-9 Berichtigung 1:2017-05 .