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For China the NOTE allowing wire to comply with UL 2556 VW-1 was removed from sub-clause 6.5.1 by a National Difference from IEC 62368-1 in GB4943.1-2022 (China National Standard). Does this mean VW-1 rated wiring is not accepted in China?

More specifically you asked: China has now published GB4943.1 2022. However, the National Differences exclude wiring tested to UL 2556 and only wire flammability tested to IEC 60332-1 and IEC 60332-2 are acceptable. Given that UL 758 includes the relevant flame tests, will this standard be accepted in China?

In response, in the China national difference from IEC 62368-1:2018 in sub-clause 6.5.1, it states: “Delete the text of the Note “Wire complying with UL 2556 VW-1 is considered to comply with these requirements.

In application, it has been determined that this means if a manufacturer of an end product applies for a CCC mark directly, the certification body in China will not accept the internal wiring and external wiring complying with VW-1 flame testing per UL 2556 (Wiring and Cable Test Methods) since the Certification Body considers UL 2556 a regional standard, not an international standard. (Note, UL 2556 is referenced in UL758 (Appliance Wiring Material) for VW-1 test methods.)

However, if a manufacturer applies an end product for a CCC mark via the IECEE CB scheme, and the CB Report states that the internal (or external) wiring complies with UL 2556 (or UL 758) with VW-1 rating, the certification body in China will accept it since UL 2556 is referred to in IEC 62368-1:2018.

Please see the following link for more information on why IEC TC108 accepts a UL 2556 VW-1 test - clause-6-of-iec-62368-1-flammability-requirements/ .

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