The Underwriters Laboratories (UL) is a Nationally Recognized Testing Laboratory (NRTL) recognized by the Occupational Safety and Health Administration (OSHA) that test products for established, self-published safety standards. UL is the most well-known listing and is used all over the globe. A product can be UL Listed or Recognized. UL Listed is the most common UL certification and means samples of the product have been tested and determined to meet the necessary safety standards. UL Recognized indicates parts of a product that are designed to be part of a whole have been tested and approved for that particular use. For example, UL wet location bulbs have been tested to withstand not only high humidity, but also direct contact with water so they can be used outside without requiring an enclosed fixture.
Back in 1896, Thomas Edison founded the Lamp Testing Bureau to test the safety of light bulbs. Now named Electrical Testing Laboratories (ETL), they cover more than just light bulbs and are one of the fastest growing safety certifications servicing the U.S. and Canada. ETL doesn’t publish their own safety standards. Instead, they tests products to the standards published by other NRTLs like UL. This means products are held to the same standards as UL and is also recognized by OSHA.
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