More specifically you asked: What PS class is a USB powered product that has no other I/O connections, has no internal battery nor internal amplifying circuitry?…
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
For a DC power supply of 48V input, is it necessary to list X capacitors connected across the input in the critical component list (CCL) - if yes then what is the safety aspect of listing them?
Do materials of a loudspeaker driver need to fulfill flammability requirements of 62368-1 when the method “Control Fire Spread” is chosen?
Do UL approved gaskets certified per UL 157 still need to be subjected to gasket tests per Annex Y.4.3 and Y.4.4 of UL 62368-1, Ed.3?
Does an Optical Isolator that meets IEC 60747-5-5 as required under cl. G.12 of 62368-1 need to fulfill the creepage distance requirements along outer component surface acc. 5.4.3?
Why was the 250VA limit under G.9 removed in IEC 62368-1 Edition 3, and when applying IEC 62368-1 Edition 3, why does it reference IEC 62368-3, when IEC 62368-3 itself refers to IEC 62368-1 Edition 2?
What are the options for marking limited power outputs, e.g., PoE ports, per the NEC Section 725.121(C)?
When AV / ICT equipment utilizes an a.c. rated fuse in a d.c. circuit, what level of investigation is required to determine if an a.c. rated fuse is acceptable for use in a d.c. circuit?
For equipment within the scope of IEC 62368-1, which incorporate radiating ultrasound or ultrasonic functions, is it required to document the ultrasound radiation as an RS1 / RS2 / RS3 energy source?
What are the compliance criteria in 188.8.131.52.3 for solid insulation used between one earthed part and another having an hazardous voltage?
Does IEC 62368-1 2nd Ed or 3rd Ed require an additional external fuse to be added to an already certified Annex CC current limiter in PoE Circuits?
Do Suppliers of components (actives and passives) to power supply manufacturers and equipment manufacturers need to certify to 62368-1 and what are those tests required?
Does the "any two leads" short exemption in B.4.1 apply to all pins on the current limiter IC complying with Annex G.9 or is only the requirement for shorting input to output waived as is implied in G.9.1?
Is additional Annex M evaluation still required if a Li-Ion battery pack certified to IEC 62133:2012 and UL 2054 is used in a host product? Will a battery pack certified by IEC 62368-1 be accepted in a host product investigated to IEC 60950-1?