The Difference Between UL Listed and UL Recognized
In this week’s blog we will review the key differences between UL ‘Listed’ and UL ‘Recognized’ approvals.
Products that carry the "UL Listed" approval label above mean that the product has been tested by UL “to nationally recognized Safety Standards and has been found to be free from reasonably foreseeable risk of fire, electric shock and related hazards in a Division 2 environment.” For those of you who don’t know, a Division 2 environment is an area in which ignitable concentrations are handled and used, but are normally in closed systems which can only escape through accidental rupture or breakdown of a system. Well known UL Listed approvals are Sun Res and VW-1.
UL Recognized is verified with this mark and is defined as “testing and evaluation of component products that are incomplete or restricted in performance capabilities.” UL Recognized products will be later used in complete end-products and systems, and may require additional installation precautions such as cable trays or housing devices to protect the product from chemicals or liquids. A common UL Recognized style is AWM (appliance wiring material).
In the simplest terms possible here are the key differences:
UL Listed approvals follow industry standards and national safety standards. Because UL Listed is connected to standards there are more restrictions and it is harder to achieve. It is common to see UL Listed approvals on products that are installed directly into harsh environments.
UL Recognized approvals are easier to attain because manufacturers can designate which components of each product they want recognized based on construction and material. Because UL Recognized is not as closely based on industry standards it is easier for a product to achieve and maintain UL Recognized approval.