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US UL Certification
UL is the abbreviation of Underwriter Laboratories Inc. (Underwriter Laboratories Inc.). The UL Safety Laboratory is the most authoritative in the United States and the largest private institution engaged in safety testing and identification in the world. It is an independent, not-for-profit, professional organization that conducts experiments for public safety. Different from FCC certification, UL certification is a safety certification. UL is mainly engaged in product safety certification and operating safety certification business. Its ultimate purpose is to obtain products with a relatively safe level for the market and contribute to the assurance of personal health and property safety.
Certification Category
The types of UL's product certification and testing services can be divided into listing, accreditation and classification.
1. LISTED:
In general, listing only applies to complete products and various components and devices that are replaced or installed in the field by qualified personnel. The various products that fall under 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. Products listed by UL can usually be marked with the UL listing mark on each product.
2. Recognized:
Approval service is a project in UL service, and the products identified by it can only be used as components and raw materials on UL listed, classified or other approved products. Approved products are not structurally complete, or have certain limitations in use to ensure the expected safety performance. Tracking services for approved products fall under the R category in most cases. Approved products belonging to category L are electronic wire (AVLV2), processing wire (ZKLU2), wire harness (ZPFW2), aluminum wire (DVVR2), and metal flexible tube (DXUZ2). Approved products are required to carry the approval mark.
3. Classification:
The grading service only evaluates the specific hazards of the product, or evaluates the products that implement other standards than UL standards (including internationally recognized standards, such as IEC and ISO standards, etc.). In general most graded products are not for consumer use, but for industrial or commercial use. The grading mark in the UL mark indicates that the product has certain restrictions and regulations when it is identified by UL. For example, chemicals such as industrial solvents are evaluated only in the range where fire may occur when the temperature reaches the ignition temperature. The grading service and listing service of some products are the same, but generally only one or several aspects of the product are evaluated. For example, in the United States, equipment such as medical X-ray diagnostic equipment must abide by US laws and related radiation emissions and beams nationwide. However, because UL only regards X-ray as a graded product, it only evaluates its mechanical properties, electrical properties and other non-radiative properties.
Certification Category
Any electrical, mechanical or electromechanical product with the UL mark indicates that the product has met the minimum requirements of the generally recognized US and Canadian product safety standards, it has been tested to meet the relevant product safety standards, and it also represents the production plant. Agree to receive strict regular inspections to ensure the consistency of product quality, and can be sold to the US and Canada markets.
