"UL listing" is mainly aimed at finished products used by end consumers, and "UL approval" is mainly aimed at parts. Using approved components in finished products can reduce the cost of applying for UL listing certification and shorten the certification cycle.
The cost of listing is generally more expensive than recognition.
Because your customer's question is very unprofessional, I have to guess that your customer may ask "UL listing" and "UL approval".
Of course, UL has many certifications. For more information, please refer to the following information:
UL's product certification and testing services can be divided into listing, approval and grading.
1) list: Generally speaking, the list is only applicable to complete sets of products and various devices and equipment replaced or installed by qualified personnel on site. Products listed by UL include: household appliances, medical equipment, computers, commercial equipment and various electrical products that play a role in buildings, such as power distribution systems, fuses, wires, switches and other electrical components. UL listed products can usually be marked with UL listing logo on each product. Usage of column name symbol.
2) Accreditation: Accreditation service is an item in UL service, and its certified products can only be used as components and raw materials for UL listing, classification or other accredited products. The approved product structure is incomplete, or there are certain restrictions on its use, which cannot guarantee the expected safety performance. In most cases, the tracking service of approved products belongs to category R. Approved products belonging to L category include electronic wire (AVLV2), processing wire (ZKLU2), wire harness (ZPFW2), aluminum wire (DVVR2) and flexible metal tube (DXUZ2). Approved products need approval marks.
3) Classification: The classification service only evaluates the specific hazards of products, or evaluates products that implement standards other than UL standards (including internationally recognized standards, such as IEC and ISO standards). Generally speaking, most classified products are not products used by consumers, but products used by industry or commerce. The classification mark in UL trademark indicates that the product has certain restrictions and prescribed scope when it is recognized by UL. For example, for chemicals such as solvents used in industry, only the range where fires may occur when they reach the ignition temperature is evaluated. The grading service of some products is the same as the listing service, but generally only one or several aspects of the products are evaluated. For example, in the United States, medical X-ray diagnostic equipment must comply with American laws and regulations on radiation emission and beam accuracy, but because UL only regards X-rays as classified products, it only evaluates its non-radiation properties such as mechanical properties and electrical properties.
4) Multi-listing, Multi-accreditation or Multi-grading services: UL applicants can apply for multi-listing, Multi-accreditation or Multi-grading services if their products need to be produced in the name of other companies due to sales needs. In this case, listed, certified or graded manufacturers are allowed to use the name of another company in the product catalog, but the product is not a company code, product code or UL.
5) "AL" listing, accreditation or rating service: If the UL applicant does not want to obtain listing, accreditation or rating service in the name of his own company, he can apply for listing, accreditation or rating service in the name of another company (usually a retailer or wholesaler), that is, "Al" listing, accreditation or rating service. Different from multiple listing, multiple accreditation or multi-level services, the applicant is not a listed person.
6) System certification service: As a member of the International Accreditation Committee, UL has extensively participated in ISO9000 quality system certification, ISO 14000 environmental protection certification, QS9000 automobile industry quality system certification and AS9000 aircraft industry quality system certification service. Up to now, 1 16 factories in China have obtained the UL system certification; Where 2 1 is ISO900 1 certified, 85 is ISO9002 certified, 1 is ISO 1400 1 certified, and 9 is QS9000 certified.
7) Other services of 7)UL: such as certification service, inspection service, fact judgment service and investigation service. I won't introduce it here.