UL's product certification, testing services can be divided into the type of listing, recognition and classification.

 1) UL listing (LISTED): Generally speaking, listing only apply to the integrity of the products and qualified personnel at the scene to replace or install the various devices and installations, a UL listing services of a variety of products including: household appliances , Medical equipment, computers, business equipment and buildings in the role of various types of electrical products, such as the distribution system, fuses, wires, switches and other electrical components, and so on. The UL listing of products, usually in each product marked with a UL listing mark.

 Understand that it «a word, emphasis on product

 2) UL recognition (Recognized): UL approved services are in the service of a project to identify its products only in the UL listing, grade or other approved products as components and raw materials used. Authorized products in the structure is not complete, or in use on a certain limit to ensure the safety achieve the desired performance. In most cases, approved the tracking service products all belong to R category. L belong to the category of electronic products are recognized (AVLV2), processing wire (ZKLU2), Harness (ZPFW2), aluminum (DVVR2), and flexible metal tube (DXUZ2). Authorized products require a recognition tag.

 In short, emphasis on parts and components.

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