Get the hard facts to successful 62368 compliance from your UL experts

The IEC 62368-1 Knowledge Hub covers an exceptionally wide range of topics, which we believe can be helpful to manufacturers and distributors of A/V & ICT equipment.

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: UL has the answer.

Q&A: You ask, we answer

With regards to Clause 4.1.1 of IEC 62368, would an external power supply, either brick type or direct plug into wall adapter, be considered an external component of a device? Wondering if the 60065 and 60950 approved EPS needs to be updated.

If a product is using a power supply certified to IEC 60950 or IEC 62368, with direct connection to the appliance mains inlet, does the 'Stored discharge on capacitors' test of 5.5.2.2 still have to be done?

IEC 60950-1 IEC 62368-1

In G.11, Capacitors and RC Units, there do not appear to be rules to determine the minimum number of capacitors required, with only "examples" given in G.11.4. Examples are not requirements, so are there other compliance criteria?

Capacitor RC Units G.11

For the wire insulation located within 13 mm from an arcing PIS at the terminal of an insulated wire used in a mains PS3 circuit, I have a question on separation of combustible materials from a PIS and requirements for internal wiring.

Does UL plan to publish a UL 62368-3 Standard based on IEC 62368-3:2017?

62368-1 Edition 3

In the Table G.9 of IEC 62368-1:2014(Ed.2), two Y2 capacitors are required for B/S insulation for 300 V OVC II, which is not in line with Table 1C of IEC 60950-1. What is the rationale for this difference?

Must external protective earthing conductors be provided with a Class I permanently connected equipment powered by DC mains, or may use of such PE conductors be indicated in user documentation?

Determination of a Resistive PIS is described differently in Ed. 2 versus Ed. 3 of IEC 62368-1. Are they different test methods? How does one actually measure the power dissipated by a component or any other location?

Resistive PIS

What if a UL HazLoc customer does not want UL 62368-1 used as the applicable OrdLoc requirements in support of their UL HazLoc certification? Can UL 60950-1 or UL 60065 continue to be used for UL HazLoc certifications?

Between now and the established transition date of 1 December 2020, UL 60950-1 and UL 60065 can continue to be used as the applicable OrdLoc requirements in support…