The National Electrical Code (NEC), or NFPA 70, is a U. S. standard for the safe installation of electrical wiring and equipment. It is part of the series of national fire codes published by the National Fire Protection Association (NFPA).
This code should not be confused with the National Electrical Safety Code (NESC) published by the Institute of Electrical and Electronics Engineers (IEEE). The NEC sets standards for outlets, boxes, grounding, GFCI and AFCI protection, and other parts of residential electrical systems. It has been developed by the NFPA National Electrical Code Committee, which consists of twenty code development panels and a correlative technical committee. This code is generally adopted by states and municipalities in an effort to standardize the application of safe electrical practices.
The NEC is used for electrical power supply and communications systems, including overhead lines, underground lines and electrical substations. The case questions the nature of the sources of funding for the development of standards, which are often adopted as law, but are created without taxpayers' money. With more than 100 years of support in the NEC development process, NECA continues to be recognized as the leading voice of electrical contractors in code development and standards. The electrical code of the outlets requires that no equipment connected by cable and plug can exceed 80% of the circuit breaker.
Unlike circuit breakers and fuses, which only open the circuit when the current exceeds a fixed value for a fixed time, a GFCI device interrupts electrical service when more than 4 to 6 milliamps of current from any of the conductors leaks to the ground. Standard 120 volt, 15 amp or 20 amp circuits can serve bedrooms, living rooms and other rooms that generally require less electricity. A ground fault circuit interrupter (GFCI) is required for all receptacles located in humid places defined in the Code. The customized deactivation and dismantling (D&D) extension of the electrical code standard defined by the National Electrical Code was developed because current engineering standards and code requirements do not adequately address the unique situations that arise during D&D activities in the U.
However, under the provisions of the National Electrical Code, an AHJ has the authority to deny approval even for listed and labeled products. In conclusion, it is important to understand that NEC sets standards for electrical work in order to ensure safety and compliance with regulations. It is also important to note that AHJs have authority to deny approval even for listed and labeled products.