UL is the abbreviation of underwriter laboratories in the United States. UL is the most authoritative and largest organization engaged in product safety test and appraisal in the United States. It was founded in 1894. It is an independent, non-profit private organization that does product safety test certification for public safety.
UL adopts scientific testing methods to study and determine whether and to what extent various materials, devices, products, equipment and buildings are harmful to life and property; Determine, compile and issue the corresponding standards and materials that help to reduce and prevent the loss of life and property, and carry out the real situation investigation business. In a word, it is mainly engaged in product safety certification and operation of safety certification business, and its ultimate goal is to obtain goods with a considerable safety level for the market and make contributions to the guarantee of personal health and property safety. So UL certification is a kind of product safety certification.
UL's product certification and testing services can be divided into listing, recognition and grading.
1. List:
Generally speaking, listing is only applicable to complete products and all kinds of devices and devices that are replaced or installed by qualified personnel on site. Products listed in UL services include household appliances, medical equipment, computers, commercial equipment and all kinds of electrical products used in buildings, such as power distribution systems, fuses, wires, switches and other electrical components. Products listed by UL can usually be marked with UL listing mark on each product. The usage of the column name flag.
2. Recognized:
Accreditation service is an item of UL service. The products identified can only be used as components and raw materials on UL Listed, graded or other approved products. The approved product is not complete in structure or has certain limitation in use to ensure the expected safety performance. In most cases, the tracking service of approved products belongs to R category. Class L products include avlv2, zklu2, zpfw2, dvvr2 and dxuz2. Approved products are required to have approval marks.
3. Classification:
Grading service only evaluates the specific hazards of products, or evaluates the products that implement other standards (including internationally recognized standards, such as IEC and ISO standards) other than UL standards. Generally speaking, most graded products are not products used by consumers, but products used in industry or commerce. The classification mark in UL Mark indicates that the product has certain restrictions and specified scope when it is appraised by UL. For example, for chemicals such as industrial solvents, only the range of fire that 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 should comply with the laws of the United States and the regulations on radiation emission and beam accuracy. However, because UL only takes X-ray as grading products, it only evaluates its mechanical properties and beam accuracy Electrical performance and other non radiation performance.
UL certification applicable product range:
1. Electronic audio visual equipment
2. Electronic components
3. Household appliances
4. Industrial control equipment
5. It equipment
6. Household lamps
7. Medical devices
8. Information equipment
9. Wire and cable
10. Others, such as plastic, glass, life buoy, fire extinguisher, etc.
