Certification Introduction
UL is a subsidiary of Underwriter Laboratories Inc. Shorthand. UL Safety Laboratory is the most authoritative in the United States and the largest private organization engaged in safety testing and appraisal in the world. It is an independent, non-profit, professional organization that conducts experiments on public safety. Different from FCC certification, UL certification is a safety certification, UL is mainly engaged in product safety certification and operation safety certification business, its ultimate purpose is to obtain goods with a considerable level of safety in the market, and contribute to the guarantee of personal health and property safety.
Certification Category
The types of UL product certification and testing services can be mainly divided into listing, recognition and grading.
1. Listed:
Generally speaking, the listing only applies to complete products and various devices and devices that are replaced or installed on site by qualified personnel, including household appliances, medical equipment, computers, commercial equipment and various electrical products that play a role in buildings, such as power distribution systems, fuses, wires, switches and other electrical components. UL-listed products can usually be marked with the UL listing mark on each product.
2. Recognized:
Accreditation service is an item in UL services, and its identified products can only be used as components and raw materials on UL listed, graded or other recognized products. Approved products are structurally incomplete or have certain limitations in use to ensure the expected safety performance. In most cases, tracking services for approved products fall under category R. Approved products in Category L include electronic wire (AVLV2), machined 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 products for specific hazards or products that comply with standards other than UL standards, including internationally recognized standards such as IEC and ISO standards. In general, most graded products are not products used by consumers, but are used industrially or commercially. The grading mark in the UL mark indicates that the product has certain restrictions and specified scope when it is qualified 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. For example, in the United States, medical X-ray diagnostic equipment and other equipment must comply with U.S. laws and regulations on radiation emission and beam accuracy, but because UL only uses X-ray as a graded product, it only evaluates its mechanical properties, electrical properties and other non-radiative properties.
Any electrical, mechanical or electromechanical product with the UL mark indicates that the product has met the minimum requirements of universally recognized product safety standards in the United States and Canada, it has been tested to meet the relevant product safety standards, and it also means that the manufacturer agrees to undergo strict periodic inspections to ensure the consistency of product quality and can be sold to the US and Canadian markets.
