For UL certification of different types of services we often see different UL certification mark, usually UL mark can be divided into three categories: UL Listed Listed, UL Recognized Recognized and UL Certification Classification Classification three different UL mark. We see in the nameplate of the power adapter above the UL Listed logo. Below we explain in detail the specific interpretation of the three.
Listed in English: Listed, concisely, the list contains the complete product, listed in the complete expression: only for the complete product and qualified personnel in the field to replace or install a variety of devices or devices. Products that fall under the UL Listing Service include: IT equipment, AV equipment, refrigerators, vacuum cleaners, household appliances, medical equipment, computers, business equipment, and all types of electrical products and other electrical components that function in buildings. UL-listed products can be marked with the UL Listing Mark on each product. Samples of the final product to be marked with the UL Listing Mark shall be tested by UL to verify that they are free from fire and electrical hazards.
Recognized in English: Recognized, recognized in a concise manner is the inclusion of parts, recognized the complete expression: mainly for components and materials to implement a safety certification. Recognized service is UL services in a project, its identification of products can only be listed in the UL, classification or other recognized products as components, raw materials used. Components recognized under the Recognition Service are assembled into finished products, which must meet the relevant licensing conditions before they can be used in the corresponding finished product, so that Recognized Products are not structurally complete or have certain limitations on their use to ensure that the desired safety performance is achieved. In most cases, the traceability of approved products falls into Category R. Approved products belonging to category L are the electronic wire AVLV2, the processed wire ZKLU2, the wire harness ZPFW2, the aluminum wire DVVR2, and the metal flexure tube, DXUZ2. Approved products are required to bear the approval mark. Therefore, switches, printed circuit boards, transformers, wires, plugs, plastic materials, etc. that make up a complete product are subject to approval. Classified English: Classified, concisely speaking, the classification of the product is only a specific hazard evaluation, UL's classification services, according to the relevant laws, regulations, for commercial or industrial and other environmental use of products for hazardous and other special performance assessment or the implementation of UL standards other than standards, such as: including internationally recognized standards, such as the IEC and ISO standards and other products for the evaluation of a safety certification process. A safety certification program that evaluates products that are not UL-approved, including internationally recognized standards, such as IEC and ISO standards. Generally speaking, most of the rated products are not consumer products, the rating service is mainly for building materials, all kinds of fire protection equipment and marine equipment, industrial or commercial use of the product UL mark of the rating symbol indicates that the product in the UL identification of a certain limitations and regulations of the scope. For example, the industrial use of solvents such as chemicals, only to its ignition temperature when the fire may occur the scope of the evaluation, the classification of certain products and the same service of listing, but generally only one or more aspects of the product evaluation, such as in the United States, medical diagnostic X-ray equipment such as national compliance with U.S. law and the relevant provisions of the radiation emitted and the accuracy of the beam, but because the UL classification only X-ray as the classification of the product, but because the UL classification is only the X-ray as the classification of the product. However, because UL classifies only X-ray as a classified product, only its mechanical, electrical and other non-radiation properties are evaluated
UL listing is primarily for finished products that are used by the end consumer, and UL recognition is primarily for components. The use of recognized components in a finished product can reduce the cost of applying for UL Listing of the finished product and shorten the certification period. Therefore, UL Listing and UL Recognition are still related to each other, and UL Classification in general, most of the classified products are not consumer products, but industrial or commercial products. The three UL Marks are used for three different services on the product and each other can not be mixed, otherwise it can be considered counterfeit products, UL's services are not only based on the U.S. UL standard, but also based on the Canadian standard cUL, which, UL Marks are also divided into for UL products and cUL products and both meet the three.