The National Electrical Code (NEC) is published by the NFPA.The practical protection of people and property from the dangers posed by electricity use is the NEC's goal.Every three years, the NEC is revised.
According to the NEC, the term "Listed" refers to products, services, or materials that are included on a list published by a Nationally Recognized Testing Laboratory (NRTL), a private organization appointed by the Occupational Safety and Health Administration (OHSA) to carry out safety testing and evaluations.
Devices and appliances that are "listed" or "labeled" in many NEC requirements have been designed, manufactured, tested or inspected, and marked in accordance with the listing agency's requirements.
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