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IEC 61557-9 Ed. 4.0 b:2023

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
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IEC 61557-9 Ed. 4.0 b:2023

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

PUBLISH DATE 2023
IEC 61557-9 Ed. 4.0 b:2023

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 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.

IEC 61557-9:2023 cancels and replaces the third edition published in 2014. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

  • new terms and definitions on maximum admissible locating AC and DC currents and voltages;
  • the requirements on locating current and locating voltage have been revised;
  • performance requirements have been added;
  • the test requirements for locating current and locating voltage have been revised;
  • the structure of this document has been adapted to that of IEC 61557-1:2019;
  • the limit values under Clause A.2 were adapted to fit the changed test methods in 6.2.3.
SDO IEC: International Electrotechnical Commission
Document Number IEC 61557
Publication Date Dec. 1, 2023
Language b - English & French
Page Count 70
Revision Level 4.0
Supercedes
Committee 85
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