Benchmarking Training Workshop

Importance of UL Mark

12:03 AM Posted by IQMS Global


All electrically controlled devices or systems in the USA must be approved. Conformity with national safety regulations is demonstrated by a mark of conformity from a qualified, recognized testing laboratory. The most widely recognized testing laboratory is UL (Underwriters Laboratories). UL conducts tests according to UL standards, which incorporate national standards as an essential component. The UL Mark is a registered certification mark of Underwriters Laboratories Inc. (UL), an independent, not-for-profit, product safety testing and certification organization. The UL Mark may only be used on or in connection with products certified by UL and under the terms of written agreement with UL.
The UL Mark on a product means that UL has tested and evaluated representative samples of that product and determined that it meets UL's requirements. The requirements are primarily based on UL's own published Standards for Safety.

The UL Mark is one of the most recognized, accepted and trusted symbols in the world. Safety-conscious and concerned consumers look for this on products because it delivers the credibility of an independent, technically expert organization which has determined whether foreseeable risks associated with the product's use have been eliminated or minimized. Even after the product is offered in the marketplace, it must continue to meet safety requirements in order to continue bearing the UL Mark, or the mark will be removed by UL.

Underwriters Laboratories’ ever-recognizable UL Mark has been a beacon of safety and peace of mind, guiding consumers to reputable electrical products that have been rigorously tested and approved for safe use. To this day, the mere presence – or lack of – the trusted UL Mark is enough to make or break the purchases of millions of consumers worldwide.


The UL Mark comes in the form of a label or is die-stamped, silk-screened or molded into a product, it needs to contain the following 4 design elements to be verified as legitimate:
• The UL trademark: the letters “UL” arranged diagonally (descending left to right) within a circle, with a small ® symbol directly below the U
• The word “listed” printed either below or beside the circle in all capital letters: LISTED
• A 4-character alphanumeric control number, or a 4 to 6-digit issue number. In the case of the issue number, it may or may not be preceded by the phrase “Issue No.” as well as 1 or 2 letters
• A product identity phrase that concisely names what the product is


Additional signs of a genuine UL Mark are:
• A UL file number (which will often have the letter “E” as a prefix)
• The manufacturer’s company name or logo
• Applicable electrical ratings
• Information designating the product’s Catalog, Model, or Type designation

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