Introduction to UL Certification in the United States
UL is mainly engaged in product safety certification and business safety certification operations. Its purpose is to provide the market with goods with a fairly safe standard and contribute to ensuring personal health and property safety. As far as product safety certification is an effective means to eliminate 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 relied on the fire insurance department to provide funds to maintain the operation. It was not until 1916 that UL was completely independent. After nearly a hundred years of development, UL has become a world-renowned certification body. It has a set of strict organizational management systems, standard development and product certification procedures. UL is managed by a board of directors composed of safety experts, government officials, consumers, education, utilities, insurance, and standards departments. Daily work is handled by the president and vice president. UL has five laboratories in the United States and is headquartered in Northbrook, North of Chicago. At the same time, UL has set up corresponding laboratories in Taiwan and Hong Kong. In the United States, UL is a symbol of safety signs for consumers. Globally, UL is one of the manufacturers 'trusted qualified assessment providers. The UL logo is usually marked on the product and/or product packaging to indicate that the product has passed UL certification and meets safety standards.
UL authentication logo

UL Certification Benefits
1, the entire United States market is very focused on product safety; When consumers and purchasing units purchase products, they will choose products with UL certification marks.
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 directly sell products to consumers, middle traders will also require that the products have UL-certified marks to make the products sell well.
American consumers and buyers are more confident in the company's products.
4, the U.S. federal, state, county, and municipal governments have a total of more than 40,000 administrative districts, all of which recognize the UL-certified logo.
UL-certified Product Services
1. LISTED:[ 1] UL certification generally applies only to complete products and various devices and devices that are replaced or installed by qualified personnel on the spot. It belongs to various products of the UL listing service, including household appliances. Medical equipment, computers, commercial equipment and various electrical products that function in buildings. Such as distribution systems, fuses, wires, switches and other electrical components. UL listed products can usually be marked with UL's listing logo and the usage of the listing logo on each product.
2. Accreditation: Accreditation services are an item in the ULL service. The products identified can only be used as components, raw materials on UL listings, ratings, or other approved products. Approved products are not structurally complete, or there are certain restrictions on their use to ensure that they achieve the desired safety performance. In most cases, the tracking service for approved products falls into category R. Approved products belonging to Class L include electronic wire(AVLV2), processing wire(ZKLU2), wire beam(ZPFW2), aluminum wire(DVVR2), and metal flexible tube(DXUZ2). Accredited product requirements are marked with accredit.
3. Classification: The grading service only evaluates the specific hazards of the product, or evaluates products that implement other standards than the UL standard(including internationally recognized standards such as IEC and ISO standards). In general, most graded products are not products used by consumers, but products used in industry or business.
The classification mark in the UL logo indicates that the product has certain restrictions and scope when it is identified by UL. For example, for chemicals such as solvents used in industry, only the range of fires that may occur when they reach the ignition point temperature is evaluated. Some products have the same classification service as listed services, but generally only one or more aspects of the product are evaluated. For example, in the United States, equipment such as medical X-ray diagnostic machines are subject to national compliance with United States laws and regulations on radiation emission and beam accuracy. However, because UL only uses X-rays as a graded product, only its mechanical properties, electrical properties, and other non-radiation properties are evaluated.
4. Multiple listing, multiple accreditation or multiple rating services: When a UL applicant obtains the above listing, accreditation or rating services, his or her product is produced on behalf of another company to meet the needs of sales and can apply for multiple listings, Multiple approval or multiple rating services, in which case the listed, approved or graded manufacturer is allowed to use the name of another company in the product list, except for the company code, product code or other features that ULC considers acceptable, Must be consistent with the original listed, approved or graded product.
5. "AL" listing, accreditation or classification services: If an UL applicant does not want to obtain listing, accreditation or classification services in the name of his own company, he can apply for listing, accreditation or classification in the name of another firm(usually a retailer or wholesaler). That is, "AL" is listed, approved or graded. Its difference from multiple listings, multiple endorsements or multiple rating services is that its petitioner is not a listed person.
6. System Certification Service: As a member of the International Accreditation Committee, UL is widely involved in ISO9000 quality system certification, ISO14000 environmental protection certification, QS 9000 automotive industry quality system certification, and AS 9000 aircraft industry quality system certification services. A total of 116 factories in the country have obtained UL system certification; Among them, 21 are ISO9001 certification, 85 are ISO9002 certification, 1 is ISO14001 certification, and 9 are QS 9000 certification.
7. Other UL services: certification services, inspection services, fact finding services, research services, etc..

UL Certification Requirements
1. Written Application for Company and Product Information: You should request in writing that UL test your products.
Company information: provide detailed and accurate name, address, contact person, zip code, telephone and fax in English and Chinese.
(a). Application company: a company that applies for product testing and is responsible for the full cost of engineering services
(b). Listed company: a company that lists names in various product catalogues published by ULL
(c). Factories: manufacturers and producers of products.
2. Product information: Product information should be provided in English.
(a). Product name: Provide the full name of the product.
(b). Product Model: List all product models, varieties or classification numbers that need to be tested.
(c). The intended use of the product: For example: home, office, factory, coal mine, ship, etc..
(d). Part list: the parts and models(classification number), rating, manufacturer's name, etc.. For insulating materials, please provide the name of the raw material, for example: GE Polycarbonate, Lexan Type 104. When the component has been UL certified or approved, please prove the specific model of the component and indicate its UL file number
(E). Electrical performance: for electrical and electronic products. Power supply diagram(circuit diagram), electrical performance table.
(f). Structure diagram: For most products, you need to provide a structure diagram or explosion diagram of the product, composition table, etc..
(g). Photographs of products, instructions for use, safety, etc., or instructions for installation.
3. When the product information is complete, the UL engineers make the following decisions based on the data: UL standard according to which the experiment is conducted, the cost of the test, the time of the test, the number of samples, etc., and notify you in writing. And send the formal application form and the tracking service agreement to your company. The fee limit specified in the application form is the cost of the project estimated by UL based on the test project. Without your written authorization, the fee limit can not be exceeded.
4. The applicant for UL Certificate of Application for Corporate Remittances, Return of Samples signs the application form and the Follow-up Service Agreement and sends the form back to the UL Company. The applicant also sends samples through bank transfer to the post office or by Speedpost. Please give an appropriate description(e.g. name, model) of the sample to be examined. Please send the application form and samples separately. For each application item, UL will specify the project number(Project No. ) to specify the project number and the name of the applicant company at the time of remittance, sample delivery and application for UL inspection.
5. UL will inform you of the date of completion of the test plan after receiving your signed application form, remittance and sample. Product testing is generally conducted in the UL laboratory in the United States, and UL can also accept audited third-party test data. The sample will be returned or destroyed according to your request. If the product test results meet the UL standard requirements, UL will issue a test qualification report and follow up service details. The test report will detail the test situation, the indicators achieved by the sample, the product structure, and the safety Mark suitable for the use of the product. A description of the product and a guidance note for the UL regional inspector are included in the tracking service details. A copy of the test report is sent to the applicant company, and a copy of the follow-up service details is sent to each production plant.
6. The applicant is authorized to use the UL logo to contact the production plant in China for the first factory inspection(Inactive Product Engineering. IPI), the inspectors inspect the storage of your products and their spare parts in the production line and in the warehouse to confirm that the product structure and parts are consistent with the tracking service rules. If required in the rules, the regional inspectors will also conduct sighting experiments. When the results meet the requirements, The applicant is authorized to use the UL logo. Following IPI, inspectors will visit the factory from time to time to inspect the product structure and conduct sighting experiments. The frequency of inspection is determined by the type of product and production volume. Most types of products are inspected at least four times a year. The inspector's inspection is to ensure that the product continues to comply with the UL requirements. Before you plan to change the product structure or components, please inform UL. For minor changes, there is no need to repeat any experiments. UL can quickly modify the tracking service details. Make this change acceptable to inspectors. When UL believes that changes in the product affect its safety performance, it is necessary to apply for the company to resubmit the sample for necessary testing.
7. If the product test results do not meet the UL standard, UL will notify the applicant that there are problems. After the applicant improves the product design, he can resubmit the product. You should tell the UL engineer what improvements the product has made. In order for it to decide that the above is the step of applying for UL certification.
UL-certified product range
Any electronic, electrical, mechanical or electromechanical product with a UL logo indicates that the product has met the generally accepted product safety standards of the United States and Canada. It has been tested to meet the relevant product safety standards. It also represents the agreement of the production plant to accept strict periodic inspections to ensure the consistency of product quality and can be sold to the markets of the United States and Canada.
UL-authentication cycle
Regular 6 to 8 weeks, can be urgent, plus urgent additional costs