ULlisted

UL listed refers to a finished product or end-use item that has been tested and certified by Underwriters Laboratories (UL), a safety science organization. The UL Listed designation signifies that the product has been evaluated for safety and compliance with applicable UL standards and is approved for installation and operation as a finished device in the United States and, in many cases, Canada. The listing is specific to the product type, model, and the standard under which it was tested, and the accompanying mark on the product or documentation identifies the scope of the approval.

Manufacturers submit samples and documentation to UL, which conducts tests and inspections to assess risks such as electrical shock, fire, mechanical hazards, and labeling adequacy. If the product meets the required criteria, UL issues a listing and assigns a listing number; the product lineage, standard reference, and permitted uses are described in UL’s database. Ongoing compliance is required: UL certifies that manufacturing facilities follow quality controls, and periodic factory surveillance includes audits and occasional re-testing to confirm continuing conformity. The UL Listed mark is typically placed on the finished product, its packaging, or the user manual.

UL listings are distinct from other UL marks. A UL Recognized Component marks indicate a component intended for incorporation into a larger system, not as a standalone finished product. UL Classified marks attest to performance claims under specific conditions of use. In North America, there are also cUL and ULus variants to denote Canada or the United States; some products may carry a combined mark such as UL Listed/cUL listed. While UL listing indicates conformance with safety standards, it does not guarantee performance or life expectancy, and listing can be void if the product is altered or manufactured outside the listed parameters.