National Electrical Code
Browse the rules and requirements of the National Board of Fire Underwriters for the installation of electric wiring and apparatus, edition by edition. Use the version row at the top of any class to compare across years.
Historical editions, transcribed in full.
Browse the rules and requirements of the National Board of Fire Underwriters for the installation of electric wiring and apparatus, edition by edition. Use the version row at the top of any class to compare across years.