UL certification
  • UL certification

UL certification


Why do you need to do UL certification? 1, the entire US market is very focused on product safety; consumers and purchase units to buy products, will choose products with UL certification mark. 2. UL has a history of more than 100 years. The image of safety is deeply rooted in consumers and the government. If you do not sell products directly to consumers, middlemen will also require products to have UL certification marks to make products sell well. 3. American consumers and buyers have more confidence in the products of enterprises. 4. There are more than 40,000 federal, state, county and municipal governments in the United States, all of which recognize UL certification marks.

UL certification is shorthand for Underwriters Laboratories (Underwriter Laboratories Inc.). UL Safety Testing Institute is the most authoritative in the United States, and it is also the largest private organization engaged in safety testing and identification in the world. It is an independent, non-profit, professional organization that does experiments for public safety. It uses scientific testing methods to study and determine whether various materials, devices, products, equipment, buildings, etc. are harmful to life and property and the degree of harm; determine, prepare, and issue corresponding standards and help reduce and prevent the loss of life and property Information, while carrying out fact-based research operations.

UL's product certification and testing services can be divided into listing, recognition and classification.

UL certification type division

UL certification

Column name (LISTED)

Generally speaking, the listing only applies to complete products and various devices and devices replaced or installed by qualified personnel on site. Various products that belong to UL listing services include: household appliances, medical equipment, computers, commercial equipment, and various electrical products used in buildings, such as power distribution systems, fuses, wires, switches and other electrical components. UL listed products, usually can be marked on each product UL's listing mark. Usage of column name flags.

认可(Recognized)

Accreditation service is an item in UL service, and the products identified can only be used as components and raw materials on UL listing, classification or other approved products. The approved product is not structurally complete, or has certain restrictions on its use to ensure the expected safety performance. In most cases, the tracking service for approved products falls into the R category. Approved products belonging to Class L are electronic wire (AVLV2), processed wire (ZKLU2), wire harness (ZPFW2), aluminum wire (DVVR2), and metal flexible tube (DXUZ2). Approved products are required to bear the approval mark.

分级(Classification)

The classification service only evaluates the specific hazards of the product, or evaluates the products that implement other standards other than UL standards (including internationally recognized standards, such as IEC and ISO standards, etc.). Generally speaking, most graded products are not products used by consumers, but products used by industry or commerce. The grading mark in the UL mark indicates that the product has certain restrictions and specified ranges when it is identified by UL. For example, in the case of a chemical such as an industrially used solvent, only the range of a fire that may occur when it reaches 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 product are evaluated. For example, in the United States, medical X-ray diagnostic equipment must comply with the laws of the United States and the regulations on radiation emission and beam current accuracy. However, because UL only regards X-ray as a graded product, it only evaluates its mechanical properties, electrical properties and other non-radiation properties.

Multiple listing, multiple endorsements or multiple grading services

When a UL certification applicant obtains the above listing, approval or classification service, and its products are produced in the name of another company to meet the needs of sales, he can apply for multiple listing, multiple approval or multiple classification service. In this case, the manufacturer who obtains listing, approval or classification is allowed to use the name of another company in the product list, but the product is except the company code, product code or other characteristics that UL considers acceptable, must be consistent with the original listed, approved or graded product.

"AL" listing, recognition or classification service

If an applicant for UL certification does not want to obtain listing, recognition or grading services in the name of his company, he can apply for listing, recognition or grading in the name of another trade name (usually a retailer or wholesaler), that is, "AL" listing, recognition or grading services. It differs from multiple listing, multiple recognition or multiple rating services in that its applicant is not a listed person.

Difference between UL listing and UL approval

In general, when it comes to "UL certification", most of them refer to "UL listing".

In addition to "UL listing", products can also apply for "UL approved parts" certification. Depending on the type of certification required, the instrument will be marked separately.

Products with "UL listing" are final products (finished products) or components installed on site. These products have been tested for installation and comply with local installation regulations, such as ANSI/NFPA 70 (National Electrical Code)(NEC).

Products with the "UL approved components" logo cannot be installed directly on site or installed independently. Of course, these products are intended as components of a system that must be UL listed ". The installation of such parts shall only be done at the factory, not on site.

In the process of obtaining the "UL approved component" certification, the product (in the sense of "UL certification", it is a component) has passed the test and evaluation specific to the corresponding system, thus simplifying the "UL listing" of the entire system.

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Tianhai testing is set up and operated in accordance with the laboratory accreditation system specification ISO 17025. The testing instruments are made up of Germany's Rohde & Schwarz, Switzerland's EMTEST, YYOKOGAWA, Agilent, Tektronix and other world's top instrument manufacturers. The equipment is advanced and sophisticated, the site environment control is reliable, traceability is strong, the technical team is senior and efficient, and close cooperation with international authoritative organizations is maintained.

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