UL Certification for Control Panels: What it is and Why You (Probably) Need It … Almost all of us have at one time or another, seen UL Listed labels (marks) on the bottom of toasters, appliances, lights, and many other consumer and industrial products and devices. Thanks to these labels, Underwriters Laboratories (UL) enjoys broad name recognition. Yet most of us are probably unaware of exactly what UL is, why it’s important, and how those ubiquitous labels came to be.

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