Compliance Engineer

DC products do require NRTL certification in the USA and Canada. There are lesser requirements for products that are supplied by SELV or ES1 low voltage and current limited sources vs. AC Mains products, but “UL” (NRTL listing or recognition) does apply. For example, a SELV/ES1 powered product may be able to use a plastic enclosure with a UL 94 flame class of HB vs. the V-1 required for an enclosure that must meet the requirements of a Fire Enclosure. Products powered solely by ordinary alkaline or carbon batteries do not require NRTL listing. On the subject of CE marking, this mark is not the equivalent of an NRTL mark. That is a common misconception. CE is a self-declaration meaning the manufacture certifies the equipment meets the safety and EMC requirements for Europe. It only has weight in Europe and unlike with NRTL Listed products, the European safety mark does not require regular factory inspections to ensure the marked product is still being manufactured with the same critical components that led to a safety approval in the first place.