Researching the LED lighting landscape, one will encounter linear fixtures and LED power supplies with UL Listed or UL Recognized markings. You may be wondering, but what do these UL certifications mean, and in what way can these UL markings affect your future lighting projects? Read on to uncover the differences in safety testing behind each UL certification and gain insight into UL lighting standards when evaluating LED lighting products.
What's The Difference Between UL Listed vs. UL Recognized LED Lighting Products?
- A UL Listed product has been tested by a recognized testing facility to meet the National Electric Code as a complete unit, whereas;
- A UL Recognized product has only some of the components tested by an independent laboratory, not the complete system
A UL Listing is almost always required by commercial building code. In an electrical product, like linear fixtures, UL specifically tests to make sure it won't end up malfunctioning and cause a fire, or some other safety hazard. If a product is UL Listed, it is deemed safe for the public.
In most cases, additional components are required to complete the led power supply and field assembly is typically required. In low voltage applications, the power supplies by many manufacturers are only UL Recognized and require a housing and/or a dimming module to complete the power supply. Once the complete system has been field assembled, it will then need to be field certified to obtain the full UL Listing according to the National Electric Code (NEC) standards.
National Electric Code: NEC-70 Article 411
The NEC-70 Article 411 describes requirements for lighting systems operating under 30 volts or less connected to a Class 2 (less than 100W) power source:
Lighting systems operating at 30 volts or less shall comply with 411.3(A) or 411.3(B).
(A) Listed System. Lighting systems operating at 30 volts or less shall be listed as a complete system. The luminaires, power supply, and luminaire fittings (including the exposed bare conductors) of an exposed bare conductor lighting system shall be listed for the use as part of the same identified lighting system.
(B) Assembly of Listed Parts. A lighting system assembled from the following listed parts shall be permitted:(1) Low-voltage luminaires
(2) Low-voltage luminaire power supply
(3) Class 2 power supply
(4) Low-voltage luminaire fittings
(5) Cord (secondary circuit) for which the luminaires and power supply are listed for use
(6) Cable, conductors in conduit, or other fixed wiring method for the secondary circuit
The luminaires, power supply, and luminaire fittings (including the exposed bare conductors) of an exposed bare conductor lighting system shall be listed for use as part of the same identified lighting system.
Specify in Confidence
Whether you are a manufacturer, distributor, contractor, designer, or specifier, understanding the rules and regulations around UL certifications for architectural LED lighting products can be challenging, yet critical.
Q-Tran is proud that all of our low-voltage transformers and DC power supplies are UL Listed as complete power supply systems; all of which are tested in both their indoor and outdoor housings and all dimming protocols. So when your evaluating LED lighting products to specify for your next project, consider Q-Tran as reputable source for safe and reliable LED lighting products.