UL (Underwriters Laboratories) is editor of different product standards. Furthermore, the UL tests and surveys the characteristics of products and systems in order to guarantee that these comply with the US American market. The PMA product portfolio comprises listed conduits and connectors which are tested and surveyed by UL.
The symbol above indicates that products have been tested at UL according to the requirements of the Bi-National cable protection standard UL 1660 - C22.2 No. 227.2.1-04 and are approved for both USA and Canada. "UL-Listed Products" are tested to a higher degree of safety than “recognized” products and can be sold for installation by untrained personnel in installations accessible to untrained personnel. A UL “Recognized” product is usually sufficient if the product is being installed into a fully enclosed system by a trained engineer.