UL Certification Type

UL certification types are: UL product certification, testing service categories can be divided for listing, recognition and classification.
1) column name ( LISTED ): Generally speaking, listing only applies to complete products and qualified personnel at the scene to replace or install a variety of devices and device, belonging to the UL listing services in a variety of products including: household appliances, medical equipment, computers, business equipment and building in the role of various types of electrical products, such as power distribution system, fuse, wires, switches and other electrical components such as. The UL listed product, can usually be on each product superscript UL listing mark. Listing mark.
UL certification listing mark
2) recognition ( Recognized ): Accreditation Service is a UL service in a project, the identification of the products only in UL, grading, or other approved products as components, the use of raw materials. Approved products is not structurally complete, or in use with certain restrictions to ensure the expected safety performance. In most cases, recognition of product tracking service belongs to class R. Belongs to the class L recognition products are electronic line ( AVLV2 ), ( ZKLU2 ), processing wire harness ( ZPFW2 ), aluminum ( DVVR2 ), and the metal flexible pipe ( DXUZ2 ). Approved products with recognition mark.
3) grading (Classification ): grading services only to product specific hazard evaluation, or to perform a UL other than standard ( including the internationally recognized standards, such as IEC and ISO standards ) product evaluation. In general most grade products are not consumers use products, but industrial or commercial use of the product. In the UL symbol classification mark indicates that the product in the identified by UL when a certain restriction conditions and scope. For example, the industrial use of the solvent such chemicals, only to achieve ignition temperature may occur when the fire of this range are evaluated. Some of the product grading services and listing services are the same, but generally only for a particular product or some aspects of evaluation, such as in the United States, medical X ray diagnostic apparatus of this kind of equipment to comply with the United States national laws and relevant radiation emission and beam precision requirements, but because UL only the X ray as graded product, so the only evaluation of its mechanical properties, electrical properties and other non radiative properties of these aspects.
4) multiple listing, recognition or multiple multiple grading services: when a UL applicants in obtaining this column names, recognition or classification of service, its products to other companies in the name of production to meet the marketing needs, can apply for a multiple listing, recognition or multiple multiple grading services, in this case, get listing, recognition or classification of the manufacturers were allowed to use the product directory of another company name, but the product of the company name, product code or UL company can accept other characteristics, must be with the original listing, recognition or classification product line.
5)" AL" listing, recognition or classification service: if the applicant does not want to use UL their company name to obtain listing, recognition or classification service, he can apply for another firm (usually a retailer or wholesaler ) name to apply for listing, recognition or classification, i.e., called "AL" listing, recognition or classification service. The multiple listing, recognition or multiple multiple grading services differ in that the applicant is not listed celebrities.