What is the standard for Ul please guys thanks!

UL's product certification, testing services can be divided into the main types of listing, recognition and classification. (1) Listed (LISTED): Generally speaking, the listing applies only to complete products and qualified personnel in the field to replace or install a variety of devices and installations, belonging to the UL listing services for a variety of products, including: household appliances, medical equipment, computers, commercial equipment, as well as in the role of the building of various types of electrical products, such as power distribution systems, fuses, wires, switches and other electrical components, and so on. UL-listed products can usually be marked with the UL Listing Mark on each product. The use of the listing mark. (2) Recognition (Recognized): Recognition services are UL services in a project, the identification of products can only be listed in the UL, classification or other recognized products as components, raw materials used. Recognized products in the structure is not complete, or in the use of certain restrictions to ensure that the expected safety performance. In most cases, the tracking of Recognized Products falls into Category R. Approved products that fall into category L are electronic wire (AVLV2), processed wire (ZKLU2), wire harnesses (ZPFW2), aluminum wire (DVVR2), and metal flex tubing (DXUZ2). Approved products are required to bear the approval mark. 3) Classification: Classification services evaluate products for specific hazards only, or for products that implement standards other than UL standards, including internationally recognized standards such as IEC and ISO standards. Generally speaking, most of the graded products are not consumer products, but industrial or commercial use of the product. UL mark in the graded mark indicates that the product in the UL identification by certain limitations and regulations of the scope. For example, chemicals such as solvents used in industry are evaluated only to the extent that they are likely to catch fire when they reach their ignition temperatures. Classification services and listing services for certain products are the same, but generally only a certain aspect of the product or a number of aspects of the evaluation, such as in the United States, medical X-ray diagnostic equipment to comply with U.S. laws and regulations relating to radiation emission and beam accuracy, but because UL only X-ray as a classification of the product, so only the evaluation of its mechanical properties, electrical properties, and other non-radiation properties of these aspects. (4) Multiple Listing, Multiple Recognition or Multiple Classification Service: When a UL applicant, after obtaining the above listing, recognition or classification service, its products to be manufactured under the name of another company to meet the need for sales, can apply for multiple listing, multiple recognition or multiple classification service, in which case, the manufacturer of the listed, recognized or classified is allowed to use the product directory of the name of the other company In such cases, the manufacturer of the listed, recognized or classified product is permitted to use the name of another company on the product list, provided that the product is identical to the original listed, recognized or classified product, except for the company designator, product designator, or any other characteristic deemed acceptable by UL. (5) "AL" listing, recognition or classification services: If the UL applicant does not want to use their own company name to obtain listing, recognition or classification services, he can apply for another firm (usually retailers or wholesalers) in the name of the application for listing, recognition or classification, that is, "AL" listing, recognition or classification services. The difference between this and a multiple listing, multiple endorsement or multiple grading service is that the applicant is not a listed person.