Many people believe that Underwriters Laboratories (UL) is the only Nationally Recognized Testing Laboratory (NRTL) that can test and certify electrical equipment as acceptable under Occupational Safety and Health Administration (OSHA) regulations.  As it turns out, UL doesn’t have and never has had a legal monopoly on certifying equipment as safe for the workplace.

In fact, UL has had serious competition from other high quality labs recognized as NRTLs by OSHA for testing and certifying various types of products for over a quarter of a century.  Many of them are also qualified by governments outside the United States to perform safety certification.

The current list of NRTLs can be found at

Manufacturers are free to choose from this list of NRTLs with the confidence that the results are all certified to meet the same safety standards.  Furthermore, while an NRTL mark – such as “TÜV” or “NSF” or “ETL” or “UL” – is required by the United States and Canadian governments for use in commercial environments, it isn’t generally required in residential settings.  Nonetheless, the lingering misconception that a “UL” mark is the only valid safety mark sometimes presents a perception challenge for manufacturers.  CURB is not immune to this prejudice.

For a variety of business reasons, CURB has been using an accredited local facility to test and certify its products (SEE  The CURB Pro model available on Amazon ( has passed all tests required for deployment in the United States, Canada, Europe and Australia.  This includes having been evaluated and tested to demonstrate compliance with the requirements of IEC 61010-1:2010, EN 61010-1:2010, UL 61010-1:2012, CAN/CSA-C22.2 NO. 61010-1-12.

The CURB Pro has also been approved to bear the mark of the Federal Communications Commission (FCC) for Part 15 Class B compliant devices and carries a valid CE mark.  We’ve initiated an application for NRTL listing, and the final step remaining before adding a “TÜV” mark to the product is an inspection of our factory.

If your local electrician is concerned about a lack of a “UL” label or has other questions about the equivalency and acceptability of various NRTLs and testing standards, there’s an informative article in the Fall 2010 issue of PROTOCOL, “Standards Watch: Acceptable in all its flavors” by Karl G. Ruling (, pp 68-71.  See also the NRTL Misconceptions FAQ at  And, of course, be sure to check your local jurisdictional regulations.

Please feel free to reach out to us directly as well.  We’d be glad to share with you more about our process and our commitment to the safety and usability of our products.