UL Introduction

UL is the U.S. Underwriter Laboratories Inc. is the most authoritative and the world's largest private organization engaged in safety testing and accreditation. It is an independent, not-for-profit, professional organization that conducts tests for public safety. It uses scientific testing methods to study and determine whether various materials, devices, products, equipment, buildings and other hazards to life and property and the extent of the hazards; determine, prepare and issue the corresponding standards and information to help reduce and prevent loss of life and property, while carrying out factual research operations.

UL Mark Introduction

UL Mark Style

The UL Mark is usually marked on the product and/or product packaging to indicate that the product has been certified by UL to meet the requirements of safety standards.
Components
The most important component of these marks is the UL design symbols, which are registered trademarks of UL

UL mark use requirements

1. The minimum height of the registered trademark should be 3/64 inches.
2. When the outer diameter of the UL mark is less than 3/8 inch, the registered trademark symbol can be ignored if it is not clearly readable under bare eyes.
3. The mark can be stamped, molded, inked, screen printed or similar methods directly and fixed on the unchanged product.
4. Access to the mark: The manufacturer may reprint or obtain from an authorized UL distributor.
5. ULus mark (only us, no c): safety mark for products entering the U.S. market; cUL (only c, no us): safety mark for products entering the Canadian market; cULus mark: safety mark for products entering the U.S. market and the Canadian market

Services

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

1. Listing (LISTED):
Generally speaking, the listing applies only to complete products and qualified personnel in the field to replace or install a variety of devices and devices, belonging to a variety of products listed by UL services include: household appliances, medical equipment, computers, commercial equipment and in the building role of various types of electrical products, 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. The use of the listing mark.

2. Recognition (Recognized):
Recognized service is a program of UL services, the identification of its products can only be used as components, raw materials on UL Listed, Classified or other recognized products. Recognized products are not structurally complete, or have certain restrictions on their use to ensure that the desired safety performance is achieved. In most cases, the tracking service for approved products falls into Category R. Approved products that fall into category L are electronic wire(AVLV2), processed wire (ZKLU2), wire harnesses (ZPFW2), aluminum wire (DVVR2), and metal flexible tubing (DXUZ2). Approved products are required to bear the approval mark.

3. Classification (Classification):
Classification services only for the evaluation of specific hazards of the product, or the implementation of UL standards other than other standards (including internationally recognized standards, such as IEC and ISO standards, etc.) for the evaluation of products. Generally speaking most of the graded products are not products for consumer use, but for industrial or commercial use. the classification mark in the UL mark indicates that the product has certain restrictions and specified scope when identified by UL. For example, for chemicals such as solvents used industrially, only the range of fires that may occur when they reach the ignition temperature is evaluated. Certain products and the same classification services and listing services, but generally only on one or several aspects of the product evaluation, such as in the United States, medical X-ray diagnostic equipment such as national compliance with U.S. laws and regulations relating to radiation emission and beam accuracy, but because UL only X-ray as a graded product, so only to evaluate its mechanical properties, electrical properties and other non-radiation performance of these aspects.

4. Multiple listing, multiple recognition or multiple classification services:
When a UL applicant has obtained the above listing, recognition or classification services, its products to be produced under the name of another company to meet the needs of sales, can apply for multiple listing, multiple recognition or multiple classification services, in this case, the manufacturer who received the listing, recognition or classification is allowed to use the name of another company in the product list, but the product in addition to the company code, product code or UL In addition to any other characteristics deemed acceptable by the company, the product must be consistent with the original listed, recognized or graded product.

5. "AL" listing, recognition or classification services:
If the UL applicant does not want to use his own company name to obtain listing, recognition or classification services, he can apply for listing, recognition or classification under another trade name (usually a retailer or wholesaler), i.e. "AL" listing, recognition or classification services. The difference with multiple listing, multiple recognition or multiple classification services is that the applicant is not a listed person.

6. System Certification Services:
As a member of the International Accreditation Committee, UL is extensively involved in ISO9000 quality system certification, ISO14000 environmental protection certification, QS9000 quality system certification for the automotive industryand AS9000 quality system certification services for the aircraft industry. A total of 116 factories in China have obtained UL's system certification; 21 of them are ISO9001 certified, 85 are ISO9002 certified, 1 is ISO14001 certified and 9 are QS9000 certified.

7. Other services of UL: 

Such as certification services, inspection services, factual judgment services, research services

Other Information

Technical information: voltage frequency AC 120/240/277V 60Hz, U.S. plugs, etc.

Whether mandatory: voluntary
Factory inspection requirements: 4 times a year

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