cULus

cULus is a safety certification mark used in North America that indicates a product has been tested and certified to meet applicable safety standards in both the United States and Canada. The mark is issued by Underwriters Laboratories (UL) and combines UL’s U.S. requirements with Canadian safety requirements, often recognizing CSA standards or UL standards adopted for Canada. A product bearing cULus has undergone evaluation for its design, construction, and intended use in order to reduce risk of fire, electric shock, and related hazards.

The certification process typically involves laboratory testing to the relevant safety standards, plus periodic factory inspections and ongoing surveillance to ensure continued compliance. The scope covers electrical and electronic equipment and, in some cases, components intended for use in finished products. The cULus mark can appear on finished consumer or industrial products, indicating dual listing for both markets.

In practice, the cULus designation is used alongside other marks such as UL Listed or cUL Listed. The presence of cULus signifies that the product meets safety requirements recognized in both the United States and Canada, which can facilitate cross-border sale and regulatory acceptance. It does not, by itself, guarantee performance, reliability, or compliance with non-safety standards unless additional certifications (such as EMC or energy efficiency marks) are pursued.

Details of specific certificates and the scope of approval are maintained in UL’s certification database, including the certificate number and listed standards. Manufacturers may renew or update certifications as products are redesigned or as standards evolve.