UL Listed vs. UL Recognized: What's the difference?

If you’ve been browsing this blog (or other helpful resources around electrical components and products), then you’ve probably come into contact with the phrases “UL Listed” and “UL Recognized.” But what do they mean? And which one is more important?

But first of all, what is “UL?”


Underwriters Laboratories (UL) is a global company that focuses on ensuring safety and standards for all design, production, and marketing. As innovation of technology (and accordingly design and production) sweeps the world, UL is invested in protecting the safety of the users, with the primary focus of North America (cULus).

According to UL, they “connect people to safer, more secure, more sustainable products, services, experiences and environments” by developing and disseminating testing for viable products.

A well-known example of UL testing and standards are fire resistant fabrics that are commonly specified for vertical applications – such as drapery or furniture panels. While the fire-resistant fabric is not law, it is so commonplace among designers that it is essentially expected.

It is also particularly important for electrical components such as those involved in power and data units in commercial, industrial, and residential buildings to be UL tested. But what do UL Listed and UL Recognized mean?


UL Listed means that samples of the specific product or component have been tested and found to safely meet at a minimum all applicable UL standards. Essentially, the specific product on its own is a UL Listed product.

For example, a UL Listed power unit has passed all UL testing in order to become listed. This product can be used on its own.


In some cases the power unit itself may only be able to be UL Recognized. In those cases, the whole desk, with integrated power (the system) will need to be tested to become a UL Listed system.

In simpler terms, when the power unit is UL Recognized, the desk it is incorporated into is will need to be UL Listed as an entire system. Certain installation standards must be met that are outside of the confines of the UL’s actual labs, such as the setting and other elements that can’t be control elements in testing.


Today, most people expect a level of corporate responsibility and sustainability. UL holds corporations to a higher standard by pushing the envelope for safety. Any time you specify a product without a UL mark, you are increasing the risk of injuring the end user.

A UL mark of any kind denotes a higher standard for your product. To people who understand UL’s importance, it means your company cares. And in an age when we all are caring more and more about the world around us, this can only be beneficial.

UL ensures that products are made to be safe, are made with safer components and in safer conditions. For designers, this means showcasing your firm’s corporate responsibility. And for marketers, this means boasting about your company’s care for its people and for people at large.

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