The NEC was first published in 1897 and is revised every three years. The 2020 edition of the NEC debuted in September 2019.
States and local jurisdictions independently determine when they will adopt a new NEC edition. Once it is locally adopted, electrical contractors and the authority having jurisdiction are responsible for ensuring compliance with the new set of requirements.
Download our eGuide to understand the impact of 2020 NEC changes that affect residential structures such as single-family, two-family, or multi-family dwelling units.