UL is short for Underwriter Laboratories Inc. The UL Safety Test Institute is the most authoritative in the United States, and it is also a large non-governmental organization engaged in safety testing and identification in the industry. It is an independent, non-profit, professional agency that conducts tests for public safety. It uses scientific testing methods to research and determine the extent to which materials, devices, products, equipment, buildings, etc. are hazardous to life and property; determine, write, and issue corresponding standards and help reduce and prevent life Data on property loss, and conduct fact-finding business. In short, it is mainly engaged in product safety certification and operating safety certification business, and its ultimate purpose is to obtain products with a fair level of security for the market, and to contribute to ensuring personal health and property safety. In terms of product safety certification as an effective means of removing technical barriers to international trade, UL also plays an active role in promoting the development of international trade.
UL was founded in 1894. In the initial stage, UL mainly maintained its operations by providing funds from the fire insurance department. Until 1916, UL was completely independent. After nearly a century of development, UL has become a world-renowned certification body, and it has a set of strict organizational management system, standard development and product certification procedures. UL is managed by a council composed of representatives from security experts, government officials, consumers, education, utilities, insurance, and standards departments. The daily work is handled by the president and vice president. Currently, UL has five laboratories in the United States, with headquarters in Northbrook, north of Chicago, and corresponding laboratories in Taiwan and Hong Kong.
UL certification specific term explanation
AL "LISTING, CLASSIFICATION OR RECOGNITION
的 A listing or accreditation service established by the applicant on behalf of the other party of the applicant (listed person) upon application and authorization
AGENT (agent)
An individual or business entrusted by the applicant to engage in activities with UL in the name of the applicant
APPEALS PROCEDURE
客户 If the customer has different opinions on the results of the engineering test or follow-up inspection, you can discuss with the relevant engineer or field representative without worrying about jeopardizing future conclusions. If a satisfactory answer cannot be obtained at this level, the client can appeal to the next level up to the president. APPENDIX (attachment)
的 A part of the rules, which includes the responsibilities of the factory and site representatives and the requirements for related tests. The tests performed on samples sent to UL may also be described.
APPLICANT (Applicant)
的 Business or individual applying to UL for testing of its parts, products, or systems. Legally, this party will be responsible for the cost of testing and tracking services, and will have rights to all information related to the results of the testing. See also agent.
AUTHORIZATION PAGE (authorization page)
Archived on the first page of the inspection service factory inspection details to authorize the corresponding inspection service (type L or R) and allowed certification marks
CATEGORY CONTROL NUMBER (CCN)
字符 Character representation of different product categories in UL listing, recognition, and classification services. For example, AVLV2 indicates electronic wires; QOWZ indicates portable lamps. Generally, XXXX is a listed product, XXXX2 is an approved product, XXXX7 is a listed product that complies with Canadian standards, and XXXX8 is an approved product that complies with Canadian standards.
COMPONENT (parts)
的 In addition to participating in the test of the entire product as part of the complete product, the performance and / or structure of the product needs to be tested separately. Parts can be listed, approved or unlisted parts.
CONDITION OF ACCEPTABILITY (applicable conditions)
项目 These items are listed in the report of approved or unlisted parts, but they are not used as the inspection basis for the site representative. These items are based on the results of the tests and indicate the limitations and conditions when using this part with the complete product. For example, in a report for a switch, the "applicable conditions" may indicate that the product is only suitable for currents below 1A or temperatures below 125C.
CONTROL NUMBER
之一 One of the four possible components of the UL recognized mark, designated by UL. The control number may be changed periodically based on different product categories and different types of tracking services.
FACTORY IDENTIFICATION
某一 An identification mark used by a manufacturer that produces the same product in different factories is used to distinguish which factory a certain product is produced in.
FACTORY INSPECTION
UL Services
UL's types of product certification and testing services can be divided into listing, recognition and classification.
1) LISTED: Generally speaking, the listing is only applicable to complete products and various devices and devices that are replaced or installed by qualified personnel on site. Various products that belong to the UL listing service include: household appliances , Medical equipment, computers, business equipment, and various electrical products that function in buildings, such as power distribution systems, fuses, wires, switches, and other electrical components. UL listed products can usually be marked with the UL listed mark on each product. The use of column name flags.
2) Recognized: Recognition service is an item in UL service. The products it approves can only be used as components and raw materials on UL listing, classification or other recognized products. Approved products are incomplete in structure or have certain restrictions in use to ensure that the expected safety performance is achieved. In most cases, tracking services for approved products fall into category R. Approved products that fall into category L include electronic wires (AVLV2), processed wires (ZKLU2), wire harnesses (ZPFW2), aluminum wires (DVVR2), and metal flexible tubes (DXUZ2). Approved products require an approval mark.
3) Classification: The classification service only evaluates 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 graded products are not products for consumer use, but products for industrial or commercial use. The grading mark in the UL mark indicates that the product has certain restrictions and specified scope when UL is identified. For example, chemicals such as solvents used in industry are evaluated only in the range of fires that may occur when they reach the ignition temperature. The grading and listing services of some products are the same, but generally only evaluate one or more aspects of the product. For example, in the United States, equipment such as medical X-ray diagnostic instruments must comply with U.S. laws and related radiation emissions and beams. The accuracy of the flow is specified, but because UL only uses X-rays as a graded product, it only evaluates its mechanical properties, electrical properties, and other non-radiating properties.
4) Multiple listing, multiple recognition or multiple grading services: When a UL applicant is obtaining the above listing, recognition or grading services