I am commenting on a question and reply which is further back in this
continuing conversation.
> Question: For products with external AC power supplies, would the NRTL
mark need > to be on the supply and the product? Or the supply only?
Previous reply: The external ac power supply must be "approved." The product
may or may not need to be approved. If the rated input voltage exceeds 30 V
rms or 42.4 V dc, then it must be approved (per the NEC). If the rated
input voltage is less than 30 V rms or 42.4 V dc, then the NEC does not
require it to be "approved;" it is a manufacturer's option whether to seek
third-party certification.
My comment: I agree that the NEC does not require products powered by Class
II sources to be Listed; however, we have found several local jurisdictions,
especially in Oregon, Washington and Florida, that do require these
products to be Listed. It is not clear that these jurisdictions actually
have local amendments to the NEC or if it is an Code interpretation issue,
but after many discussions with these jurisdictions, we have given up and
now require that all of our Class II powered devices be UL Listed.
Richard Woods
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