The National Fire Protection Association, NFPA, provides the National Electrical Code, NEC, book that documents guidelines for safe electrical design, installation and inspection. The NFPA 70: NEC is available for purchase in multiple electronic and print formats and for free in read-only format with the creation of a log-in account.
The NEC is updated every three years by the NFPA. It encompasses the wiring and installation of signaling and communications conductors and equipment, electrical conductors and equipment and optical fiber cables in residential, commercial and industrial construction. Its purpose is to minimize the risk of electricity as the source of electric shock or ignition point of fire and explosion.