| http://www.w3.org/ns/prov#value | - NRTLs include UL, CSA, ETL, ENTELA and several others, but by far the most widely recognized in the US is UL and in Canada, CSA. If you do NOT have a listing label ON YOUR PRODUCT when it is installed, the local electrical inspector can (and usually will) disallow its installation or connection, effectively stopping whatever project your product is being used on.
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