Introduction of UL certification
 

UL is a abbreviation of Underwriter Laboratories Inc. The UL Security Institute is the most authoritative body in the United States, It is also a large civil institution engaged in safety testing and identification in the world. It is an independent, non-profit, professional organization for public safety testing. It uses scientific testing methods to study and determine the extent to materials, installations, products, equipment, buildings, etc which are harmful and harmful to life and property; Determine, prepare and release relevant standards and the information that helps to reduce and prevent loss of life or property, also carry out the truth research business at the same time. In short, it is mainly engaged in product safety certification and management of safety certification business, the ultimate aim is to secure a fairly safe level of goods for the market, and contribute to ensuring personal health and property security. Regarding product safety certification as an effective means of eliminating technical barriers to international trade, UL plays an active role in promoting the development of international trade.
UL was founded in 1894, and in the initial stage, the UL maintained its funding operations in the fire insurance department, and until in 1916 UL was fully independent. After nearly a hundred years of development, UL has become a world-renowned certification body, which has a full set of strict organizational management system, standard development and product certification procedures. UL is managed by a Council of security experts, government officials, consumers, education, utilities, insurance and standards departments; the daily work of UL is handled by the president and vice president. Currently, UL has five laboratories in the United States, the headquartered is in Northbrook, north of Chicago, at the same time, the corresponding laboratories were set up in Taiwan and Hongkong respectively.
 
Terminology interpretation of UL certification
AL" LISTING ， CLASSIFICATION OR RECOGNITION
Application and authorization by the applicant, Established listed or approval service by different from the applicant (list of celebrities) on the other side.
AGENT
Entrusted by the applicant, an individual or enterprise engaged to help the applicant and communicate with UL.
APPEALS PROCEDURE
If the customer has different views on the results of the engineering test or tracking test, they may discuss it with the relevant engineer or field representative without fear of compromising the future conclusions. If a satisfactory response cannot be reached at this level, the customer may lodge a complaint to the higher level until to the president.
APPENDIX
A part of the detailed rules, which is includes the responsibilities of the factory, the Site Representatives, and the requirements for the relevant tests. It is also possible to describe the tests carried out for samples sent to UL.
APPLICANT
An enterprise or individual who are applies to the UL for testing its components, products, or systems. Legally, this party will be responsible for testing and tracking the cost of the service and for all the information relating to the results of the test. See the Agency.
AUTHORIZATION PAGE
File at the front page of inspection service factory inspection rule, to authorize corresponding tracking inspection services (class L or R class) and permitted certification marks.
CATEGORY CONTROL NUMBER (CCN)
The character representation of different product categories in UL listed, approval, and classification services. For example, AVLV2 represents an electronic line, QOWZ stands for portable lamps. In general, XXXX is the listed of the product and XXXX2 is the authorized product, XXXX7 stands for products listed in conformity with Canadian standards, XXXX8 represents the approved products are compliant with Canadian standards.
COMPONENT
A part of a product, to being a part of the complete product, and participate in the testing of the whole product, also need to test its performance and / or structure separately. Parts may be listed, recognized or non - listed components.
CONDITION OF ACCEPTABILITY
These items are listed in the reports of approved or non listed components, but not as the basis for inspection by site representatives. These projects are based on test results that indicate the limits and conditions for the parts to be used with the finished product. For example, in a switch report, it may be indicated the applicable conditions that the product applies only to currents below 1A or below 125C.
CONTROL NUMBER
UL identifies one of the four possible components of the mark, specified by UL. Depending on the product category and the type of tracking service, control numbers may be changed periodically.
FACTORY IDENTIFICATION
An identification mark used by a manufacturer who produces the same product in different factories to distinguish which plant is produced at which plant.
FACTORY INSPECTION
UL Services Project
The types of UL certification and testing services can be classified into listed, recognized and classification.
1.  LISTED: Generally speaking, listed apply only to complete products and various devices and devices for qualified personnel to replace or install them on the spot, a variety of products that belong to the UL listed service are include：household appliances, medical equipment, computers, commercial equipment, and all kinds of electrical appliances that work in buildings, such as power distribution systems, fuses, wires, switches, and other electrical components. Products that are listed by UL are usually marked with UL on each product.
2.  Recognized: A recognized service is a project in the UL service; the identified products can only be used as components and raw materials on UL listed, grades or other approved products. The approved product is structurally incomplete or has limited use in order to achieve desired safety performance. In most cases, the tracking service of an approved product are belongs to the R class. Recognized products belonging to the L class include electronic wire (AVLV2), processing wire (ZKLU2), wire harness (ZPFW2), aluminum wire (DVVR2), and metal flexible tube (DXUZ2). Approval products are subject to approval marks.
3.  Classification：The Classification service only evaluates the specific hazards of the product, or evaluates the other standards of UL standards, including internationally recognized standards, such as IEC and ISO standards. In general, most classification products are not consumer products, but industrial or commercial use products. The grading mark in the UL mark indicates that the product has certain restrictions and limits when it is identified by the UL. Chemicals such as solvents, for example, are only evaluated for the range of fires that may occur when the ignition temperature is reached. The classified service of some products is the same as the listed service, but generally only a part of the product or a number to have evaluation, In the United States, medical X - ray diagnostic equipment shall be subject to national laws and regulations relating to radiation emission and beam accuracy throughout the country, But since UL only uses X rays as a graded product, it just evaluates its mechanical, electrical, and other non radiative properties.
4. Multiple listed, multiple recognized or multiple classification services:
When a UL applicant was obtains the above listed, recognized or classification service, the product need manufactured under the name of another company to meet the sales needs, in this time you can apply for multiple listed, multiple recognized or multiple classification services. In this case, recognition or classification of manufacturers are allowed to use the product list in the name and can use the another company name, however, in addition to the company code, product code or other features that UL believes is acceptable, it must be consistent with the original name, recognized and classification of the product.
5.  AL" listed, recognized or classification service: If the applicant does not want to get UL name recognition or classification service with the name of his company, he can apply for another firm (usually a retailer or wholesaler) in the name of the listed, recognized or classification, which is called "AL", listed, recognized or classification service. Its distinction from multiple listed, multiple recognitions, or multiple classification services are that the applicant is not a listed people.
6. System certification service: As a member of the International Accreditation Committee, UL is widely involved in the ISO9000 quality system certification, ISO14000 environmental protection certification, QS9000 automotive industry quality system certification and AS9000 aircraft industry quality system certification services. So far, a total of 116 factories in China have obtained UL system certification, there are 21 are ISO9001 certification, 85 for ISO9002 certification, 1 for ISO14001 certification, 9 for QS9000 certification.
7. Other services of UL: Such as certification service, inspection service, truth judgment service, investigation service, etc.