40.60 Close of voting Dec 19, 2025
CENELEC
CLC/TC 85X Measuring equipment for electrical and electromagnetic quantities
European Norm
25.040.40 Industrial process measurement and control
Draft
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. Additional data for a selection of devices in other standards should be noted.
NOTE Further information on insulation fault location can be found in the following standards:
IEC 60364-4-41:2005, 411.6, and IEC 60364-5-53:2019, 531.3.
Legislation related to this standard
Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
PUBLISHED
EN IEC 61557-9:2025
IN_DEVELOPMENT
EN IEC 61557-9:2025/prAA:2025
40.60
Close of voting
Dec 19, 2025
