Researching the luminaire landscape, one will encounter fixtures and power supplies that are either UL Listed or UL Recognized. Whether you are a manufacturer, distributor, contractor, designer, or specifier, understanding the rules and regulations around UL listing for LED low-voltage power supply and LED strip products can be challenging but critical.
So what's the difference and how does it affect your project?
- 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 but not the complete system.
In most cases, additional components are required to complete the 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, to meet the National Electric Code the system will need to be field certified to obtain the full UL Listing.
The NEC-70 Article 411 describes requirements for lighting systems operating under 30 volts or under connected to a Class 2 (less than 100W) power source.
NEC-70 ARTICLE 411 specifically states:
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.
Q-Tran is proud that all of our low voltage power supplies are UL Listed as complete power supply systems. Each of our power supplies have been tested in both their indoor and outdoor housings with all of our dimming protocols so you will have the confidence to specify and install our power supply centers ensuring your project has the highest quality power supplies or luminaires that meets the National Electric Code.