There are two types of product certifications in the United States – finished product certifications and component certifications. It is very important that you know the difference and that you know the limitations involved with using certified components.

Components that are intended to be used in the manufacturing of other products are usually certified as “components” with “conditions of use” indicating the acceptable application and use criteria for the component. UL refers to the components it certifies as “Recognized Components”. UL Recognized Components are marked with a backwards UR which looks like this:

Listed Products: Finished products are “Listed”. A “Listed” product has all “conditions of use” marked on the product, the packaging, and/or the instruction manual. A “Listed” product is ready to be installed and used.

Listed Components: There are also some “Listed” components that are Listed because they can be purchased over the counter and are field installed (light switches, wire nuts, j-boxes, fuses, etc.). Listed products bear the certification mark of the US-NRTL that certified the product. Here is an example of UL’s certification mark for “Listed” products and “Listed” components:

Component Application: When using certified components, be aware of the limitations

*: UL in a circle and the backwards UR marks are registered trademarks of Underwriters Laboratories, Inc.

CertifiGroup operates a complete Product Test & Certification Lab CertifiGroup can certify or field label your products to UL & CSA standards On-site, at your facility, or in our lab!

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