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OSHA, the Occupational Safety and Health Administration, is the division of the US government that qualifies testing facilities as NRTL’s. NRTL-approved products are easily recognized by a symbol on the outside of the product. This symbol is often referred to as an “NRTL mark.” The UL (Underwriter’s Laboratory) symbol is probably the most recognized by the general public in the United States. Not only do the United States and Canadian governments require an NRTL mark, but additionally, many large customers (i.e. their procurement departments) will require an NRTL mark before buying your product. This tells the purchasing company that your product has been held to a nationally recognized standard for safety.