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What is UL certification?
UL is a short description of Underwriter Laboratories Inc. UL safety test is the United States the most authoritative, but also the world engaged in safety testing and identification of the larger civil institutions. At present, UL is mainly engaged in product testing, management system assessment, quality system review registration, product testing and standard development and other aspects of the work.
For UL different types of services, UL mark can be divided into three categories, namely, column name, classification and recognition mark.
1, listed
Only for complete products and qualified devices in the field to replace or install a variety of devices or devices. Products belonging to UL listed services include: IT equipment, AV equipment, refrigerators, vacuum cleaners and other electrical equipment. If the final product is marked with a UL listed mark, the sample should be tested by UL to confirm that there is no risk of fire and electrical hazards.
2, classified
UL classification services, is based on the relevant laws and regulations, for commercial or industrial environments such as the use of dangerous products such as the risk of a safety certification procedures. Classification services mainly for building materials, a variety of fire protection equipment and navigation equipment. The same time as
3, recognized (recognized)
Recognition is primarily a safety certification for components and materials. The approved components of the approved service are assembled in the finished product and the components must comply with the relevant licensing conditions to apply to the finished product. Such as: switches, power supply, printed wiring board, transformers, wires, plugs, plastic materials are recognized objects.
Three signs were used for three different services on the product, can not be mixed, or can be considered a counterfeit product.

UL标志右下方的“us”表示适用于美国，左下方的“c”表示适用于加拿大，同时具有“us”和“c”则在两个国家都适用。例如：

UL product certification scope
Electrical and electronic, mechanical or mechanical and electrical products.
Any electronic, mechanical, or electromechanical product with a UL mark indicates that the product has met the minimum requirements of the generally accepted US and Canadian product safety standards, which are tested to comply with the relevant product safety standards and also represent the production plant Agreed to receive strict periodic checks to ensure product quality consistency, can be sold to the United States and Canada, the two markets.