Electronic Hardware Standard Certification Marks

Underwriters Laboratories Inc. 
UL Listing Mark
This is one of the most common UL Marks. If a product carries this Mark, it means UL found that samples of this product met UL's safety requirements. These requirements are primarily based on UL's own published Standards for Safety. This type of Mark is seen commonly on appliances and computer equipment, furnaces and heaters, fuses, electrical panelboards, smoke and carbon monoxide detectors, fire extinguishers and sprinkler systems, personal flotation devices like life jackets and life preservers, bullet resistant glass, and thousands of other products.
C-UL Listing Mark
This mark is applied to products for the Canadian market. The products with this type of mark have been evaluated to Canadian safety requirements, which may be somewhat different from U.S. safety requirements. You will see this type of Mark on appliances and computer equipment, vending machines, household burglar alarm systems, lighting fixtures, and many other types of products.
C-UL US Listing Mark
UL introduced this new Listing Mark in early 1998. It indicates compliance with both Canadian and U.S. requirements. The Canada/U.S. UL Mark is optional. UL encourages those manufacturers with products certified for both countries to use this new, combined Mark, but they may continue using separate UL Marks for the United States and Canada.
Classification Mark
This mark appears on products which UL has also evaluated. Products carrying this mark have been evaluated for specific properties, a limited range of hazards, or suitability for use under limited or special conditions. Typically, products Classified by UL fall into the general categories of building materials and industrial equipment. Examples of types of equipment Classified by UL include immersion suits, fire doors, protective gear for fire fighters and industrial trucks.
C-UL Classification Mark
This Classification marking is used for products intended for the Canadian marketplace. It indicates that UL has used Canadian standards to evaluate the product for specific hazards or properties. Examples of C-UL Classified products include air filter units, firestop devices, certain types of roofing systems, and others.
C-UL US Classification Mark
UL introduced this new Classification Mark in early 1998. It indicates compliance with both Canadian and U.S. requirements. The Canada/U.S. UL Mark is optional. UL encourages those manufacturers with products certified for both countries to use this new, combined Mark, but they may continue using separate UL Marks for the United States and Canada.
Recognized Component Mark and Canadian Recognized Component Mark
These are marks consumers rarely see because they are specifically used on component parts that are part of a larger product or system. These components may have restrictions on their performance or may be incomplete in construction. The Component Recognition marking is found on a wide range of products, including some switches, power supplies, printed wiring boards, some kinds of industrial control equipment and thousands of other products. Products intended for Canada carry the Recognized Component mark "C."
Recognized Component Mark for Canada and the United States
This new UL Recognized Component Mark,which became effective April 1, 1998, may be used on components certified by UL to both Canadian and U.S. requirements. Although UL had not originally planned to introduce a combined Recognized Component Mark, the popularity of the Canada/U.S. Listing and Classification Marks among clients with UL certifications for both Canada and the United States has led to the new Mark.
International "emc-Mark"
The International "emc-Mark" appears on products meeting the electromagnetic compatibility requirements of Europe, the United States, Japan, Australia, or any combination of the four. In the United States, some types of products can't be sold without proof of compliance to U.S. electromagnetic compatibility requirements. The types of products that are subject to EMC testing include medical and dental equipment, computers, microwave ovens, televisions, radios, transmitters, and radio-controlled equipment.
EPH Product Mark
The UL EPH mark appear on products that have been evaluated to Environmental and Public Health Standards. The "Classified" version is used for products complying with ANSI/NSF Standards and other food equipment hygiene codes and requirements. Examples include Food Service and Meat and Poultry Plant Equipment and Drinking Water Additives. The "Listed" version is typically used for products complying with UL's own published EPH Standards for Safety.
Food Service Product Certification Mark
The UL Food Service Product Certification Mark is UL's Classification Mark with specific reference to the appropriate NSF International standard. In addition, at the manufacturer's option, a supplemental Mark can be applied as shown. Equipment bearing the Mark is not limited to electrical products, but also includes gas appliances and non-powered equipment. These products are commonly found in commercial food establishments, institutional food services and other locations.
Field Evaluated Product Mark
A Field Evaluated Product Mark is applied to a product that is thoroughly evaluated in the field instead of UL's laboratories or the manufacturer's facility. If a product has been significantly modified since its manufacture or the product doesn't bear any third-party certification mark, a building owner, a regulatory authority, or anyone else directly involved with the product can request that UL conduct tests in the field on the specific piece of equipment. Products that meet appropriate safety requirements are labeled with a tamper-resistant Field Evaluated Product Mark.
Facility Registration Mark
The UL Registered Firm Mark is a mark you will never see on a product. Instead, it indicates that a particular facility has passed UL's evaluation to quality assurance standards and is used in promotion and marketing by companies with quality assessment programs audited by UL. The standards UL uses are the ISO 9000 series of quality assurance standards; QS-9000, the quality standards developed by the Big Three U.S. automakers for their suppliers; and ISO 14001, the standard covering environmental management systems.
Marine Mark
The UL Marine mark appears on products which have been evaluated specifically for marine use. Products bearing this Mark have been evaluated to UL's published Marine Safety Standards and other applicable standards and codes. These requirements address hazards that can occur as a result of exposure to harsh marine environments such as vibration, shock (impact), ignition protection, water ingress and salt spray corrosion common on pleasure craft and boats. Examples of the type of equipment suitable for the UL Marine Mark include alternators, battery chargers/power inverters, navigation lights, and fuel tanks, filters and pumps.
AR-UL Mark Used in conjunction with the mandatory "S" Mark of Argentina's National Office of Internal Commerce (Direccion Nacional de Comercio Interior, or DNCI), the "AR-UL" Mark indicates a product's compliance with Phase III of Argentina's Resolution 92/98. Most electrical and electronic products entering Argentina will have to display the "S" Mark adjacent to the Mark of an accredited and Recognized third-party certification organization such as UL de Argentina, S.R.L..

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