Get the hard facts to a successful transition – from your UL experts

The IEC 62368-1 Toolkit covers an exceptionally wide range of topics, which we believe can be helpful to manufacturers and distributors of A/V & ICT equipment as you plan your transition.

This Q&A includes many of the questions we have been asked, with answers from UL experts. Registered users may also submit additional questions related to the 62368 transition: UL has the answer.

Q&A: List of articles with Clause

What kind of ES class can we define for the secondary circuits(SELV) of one AC PSU certified according to 60950-1 previously now need to comply with 62368-1:2014 Ed.2, the AC PSU can meet SELV requirement, but cannot meet ES1 requirement.

62368 Clause 5.2.2.5 states that voltage cannot go over 42.4Vpk if less than 3secs. So, does this mean in hiccup mode the output cannot go over 42.4Vpk? Therefore a 48V output will not pass to ES1? This is different to 60950.

IEC 60950-1 Clause

It is understood you are asking, “What are the ES1 voltage limits when a power supply goes into a hiccup mode (repetitive peaks) i.e., pulse off time less than…