When you get a USB data lead, how to judge whether it is in line with UL or standard, the printing that is the first to look at the surface of the wire, can also be traced back to the manufacturer according to the content of the printing, today we come together to understand, the mark on the surface of the wire, Welcome to make a brick exchange!
UL safety certification is divided into three types: recognition, listing, grading, three different signs, the most widely known service in UL safety certification, the letter brother on the product represents the UL listing mark, on behalf of the manufacturer to let UL according to the United States The approved safety standards test the sample and, under reasonable and foreseeable conditions, the sample will not cause fire, electrical leakage and related hazards.
Horizontal development to learn the basis of UL certification
■ LISTED: Generally speaking, the column name is only applicable to the complete product and various devices and devices that are qualified or replaced by the qualified personnel. The various products belonging to the UL listing service include: household appliances, Medical equipment, computers, commercial equipment, and various electrical products that function in buildings, such as power distribution systems, fuses, wires, switches, and other electrical components. UL listed products can usually be marked with a UL listing mark on each product. The use of the column name flag.
■Recognized: An accredited service is a project in a UL service that identifies products that can only be used as components and raw materials on UL listings, grading, or other approved products. The approved product is not structurally complete or has certain limitations in 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), machined wire (ZKLU2), wire harness (ZPFW2), aluminum wire (DVVR2), and metal flexible pipe (DXUZ2). Approved product requirements are marked with an approval.
■ Classification: Classification services only evaluate the specific hazards of the product, or evaluate products that implement 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 products used industrially or commercially. The grading mark in the UL Mark indicates that the product has certain restrictions and specified ranges when it is UL-approved. For example, a chemical such as a solvent for industrial use only evaluates the range of fires that may occur when the ignition temperature is reached. Some products have the same grading service and listing service, but generally only evaluate one aspect or several aspects of the product. For example, in the United States, medical X-ray diagnostic equipment must comply with US laws and related radiation emission and beam. Flow accuracy is specified, but since UL only uses X-rays as a graded product, only its mechanical, electrical, and other non-radiative properties are evaluated.
■Multi-column, multi-approval or multi-UL service reclassification service: When a UL applicant obtains the above listed, approved or grading services, its products are produced in the name of another company to meet the needs of sales. You can apply for multiple listings, multiple approvals or multiple grading services. In this case, the manufacturer who is listed, approved or graded is allowed to use the name of another company in the product list, except for the company code. Product code or other features deemed acceptable by UL must be consistent with the original listed, approved or graded product.
To be continued.....