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The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. It is part of the National Fire Code series published by the National Fire Protection Association (NFPA), a private trade association . [ 1 ]
NFPA 70E (Standard for Electrical Safety in the Workplace) is a standard of the National Fire Protection Association (NFPA). The document covers electrical safety requirements for employees. The document covers electrical safety requirements for employees.
At the time, there were nine such standards in effect within 100 miles (160 km) of Boston, Massachusetts, and such diversity was causing great difficulties for plumbers working in the New England region. [6] The next year, the committee published its initial report on a uniform standard, and went on to form the NFPA in late 1896.
Electrical shocks on humans can lead to permanent disabilities or death. Size, frequency and duration of the electrical current affect the damage. [8] The effects from electric shock can be: stopping the heart beating properly, preventing the person from breathing, causing muscle spasms.
NFPA 70B (Standard for Electrical Equipment Maintenance) is a standard of the National Fire Protection Association that addresses preventive maintenance for electrical, electronic, and communication systems and equipment—such as those used in industrial plants, institutional and commercial buildings, and large multi-family residential complexes—to prevent equipment failures and worker ...
For this reason, in the United States the National Electric Code (document NFPA 70, Article 314) states that ceiling fans must be supported by an electrical junction box listed for that use. It is a common mistake for homeowners to replace a light fixture with a ceiling fan without upgrading to a proper junction box [ citation needed ] .
In square mils, the area of a circle with a diameter of 1 mil is: = = = = ( ) = . By definition, this area is also equal to 1 circular mil, so = . The conversion factor from square mils to circular mils is therefore 4/ π cmil per square mil:
Breaking capacity or interrupting rating [1] [2] is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration.