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  • BSI
    BS EN IEC 61557-9:2025 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 - Equipment for insulation fault location in IT systems
    Edition: 2025
    $495.05
    / user per year

Description of BS EN IEC 61557-9:2025 2025

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: a) new terms and definitions on maximum admissible locating AC and DC currents and voltages; b) the requirements on locating current and locating voltage have been revised; c) performance requirements have been added; d) the test requirements for locating current and locating voltage have been revised; e) the structure of this document has been adapted to that of IEC 61557-1:2019; f) the limit values under Clause A.2 were adapted to fit the changed test methods in 6.2.3.

Standard NumberBS EN IEC 61557-9:2025
TitleElectrical 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 - Equipment for insulation fault location in IT systems
StatusDefinitive
Publication Date2025-04-09
ReplacesBS EN 61557-9:2015
Identical National Standard OfIEC 61557-9:2023, EN IEC 61557-9:2025
DescriptorsElectrical faults, Safety devices, Computer hardware, Computers, Defects, Electric power distribution, Accident prevention, Electrical measuring instruments, Low voltage, Computer networks, Electrical safety, Low-voltage equipment, Electrical protection equipment, Electrical insulation
ICS29.080.01 Electrical insulation in general, 17.220.20 Measurement of electrical and magnetic quantities, 25.040.40 Industrial process measurement and control
CommitteePEL/85
ISBN978 0 539 17855 5
PublisherBSI
Pages40



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About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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