A product that has the listing mark of UL, ETL or CSA means that the entire product and all of its components have been tested as they are used in connection with one another. This means that the entire product meets the applicable UL standard -- not just one or some of the components (like the power supply or electrical cord).
Testing is completely documented in a testing report. The components used are listed in the report and are essentially registered for the applicable product. Assembly factories are subject to unannounced inspections to assure ongoing compliance with the testing reports.
Each is a separate testing organization, and certification marks –ETL, CSA or UL Listed Mark –- demonstrate compliance to widely accepted product safety standards. All three are recognized as NRTLs in the U.S. and, in a similar capacity, as a testing organization and certifying body in Canada by the Standards Council of Canada. Interestingly, Canada has legislation requiring products being sold to be listed to the UL standards.
All three organizations test to the exact same standard. One of the key decisions in choosing whom to use is that testing through ETL or CSA for potential listing tends to be faster than UL's timeframe. Quite simply, the quicker one can complete testing, the sooner they can bring a recognized and listed product to market.
Using products that are proven to be safe when used as intended would be important not just for the safety of our own customers, but for the safety of all of those participating in an event. Secondly, comes the concern of liability. If damage occurs from the use of a product that is not listed with UL, ETL or CSA, there is a significantly higher degree of negligence and potential liability.
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