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
What are the principles of Double Safeguard constructions as they relate to accessibility requirements to ES3 energy sources?
Are all repetitive signals, which exceed the limits of IEC 62368-1:2014 - Table 8, independent of frequency and wave form, considered ES3?
Does Functional Insulation always need to be evaluated per Annex B.4.4, including for Class III products?
Can the requirements for protection of wound components against mechanical stress in G.5.1.2 be waived if an Insulation System is used according UL 1446?
Should the cumulative effect of small parts be considered for the exemptions in sub-clause 6.3.1 of IEC 62368-1?
If an external power supply output to a product is power limited in accordance to 62368-1, could the product'™s polymeric enclosure be flame rated HB?
Power-limited is a undefined term in IEC 62368-1, although what probably is meant is that the power supply supplying the product has an output limit associated…
Is a local indoor FXS analogue telephone port on a router considered ES2, regardless of the working voltage or current?
Does every step-down switch mode power supply need to be subjected to Energy Source Classification?
If a product is supplied by USB only, what kind of PS class can be considered for that product?
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?…
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?
Why do PoE ports require markings of the electrical output ratings?
May the 3.5mm audio output jacks of laptop computers and phones be "declared" as PS1?
Do materials of a loudspeaker driver need to fulfill flammability requirements of 62368-1 when the method 'œControl 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?