9EATON CORPORATION BR003010ENWas the change to the standard unexpected?The approach to apply and recommend AFDDs with respect to IEC 60364-4-42 was not unexpected. So far, no protective device being able to detect and effectively disconnect serial arc faults had been identified in IEC 60364, i.e. no device having the capability to significantly lower the risk of electrically ignited fire hazards was mentioned. Although the AFDD product standard was published in 2013 and the first such products were already available in 2012, the IEC 60364 series published in 2014 is the first standard for low-voltage electrical installations that actively recommends the AFDD.What is the effective date of application for the new IEC 60364-4-42 standard?IEC 60364-4-42:2014 represents the state-of-the-art standard for the protection against thermal hazards, and, if not conflicting with any national regulations and laws, it can be applied in any IEC member state worldwide effective immediately. Therefore, its recommendations and technical advice shall be applied immediately if state-of-the-art protection is desired or required. Furthermore, electricians normally follow their national standards based on IEC 60364 or HD 60364 to ensure conformity with legal requirements and low-voltage regulations. If national standards do not yet re-fer to the application of AFDDs in low-voltage electrical installations, IEC 60364-4-42 represents a suitable framework to increase the safety level for protection against thermal hazards. Is there a transition period?Yes, any IEC standard has a date of publication and a date of withdrawal. The transition period is the time between the date when a new standard has to be implemented on national level and the date when the „old“ conflicting national standards have to be withdrawn.Possible uncertainties for planners and constructors of electrical systems can be avoided if new standards are applied from the date of publication.?
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