Thanks, Bozidar for your timely reply. UL stands for Underwriters Laboratories. It is one of the well-known testing agencies that the U.S. government approved to perform safety testing for the federal agency Occupational Safety and Health Administration (OSHA). OSHA maintains a list of approved testing laboratories, which are known as Nationally Recognized Testing Laboratories. UL is

The bottom line is, it ensures the U.S. government and the end-user that the electrical product being used was built in an approved way and complies with the countries (in this case U.S.) safety codes.

It is somewhat reassuring that the product that you are plugging into your home's electrical system passed/complies with U.S. safety codes.

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• New User U on Dec 5, 2019