The electrical devices used in the US workplace and all electrical devices that connect to the electricity supply in Canada are required to get NRTL approval (i.e., Tested and Certified). Nemko is one of the Nationally Recognized Testing Laboratories (NRTL) recognized by Occupational Safety and Health Administration (OSHA) and Standards Council of Canada (SCC). Therefore, N-Mark is equally authentic to other NRTL Marks. STC has been accredited by Nemko to provide N-Mark testing and certification for Medical Electrical Equipment, Household Electrical Appliances, Domestic Audio/Video Products and Information Equipment.