Conductors should be of an appropriate size for the application, and should pass through openings with no sharp edges with sufficient clearance to prevent fraying or damage. If they are accessible to the user of the product, they must be tested to withstand a certain amount of “strain” (for more on strain relief, see below). Finally you can never cross low voltage and high voltage conductors unless the low voltage wiring is rated for the higher voltage. For example, a wire carrying 12 volts may be in contact with a wire carrying 120 volts so long as it is rated for 120 volts itself.

 

Most of our discussions with clients begin like this: “I need to get a UL mark on my product, but it should be pretty easy because all of the major components have a UL mark…”, or “I’ve got almost the exact same product as this one with an ETL mark, so I don’t need to do any testing…”

 

 

 

 

Our 25 years of experience in testing has shown us that 9-out-of-10 products fail the first time they undergo testing. We can help you avoid many testing problems, and find solutions for whatever noncompliance issues might arise.