At its Oct. 9, 2018, public hearing, the City of Tucson adopted the 2017 National Electrical Code (NEC). Tucson was previously on the 2011 NEC, so they are skipping the 2014 NEC and are adopting the most current edition. The new Code will be effective in Tucson on Jan. 1, 2019.
With a population of 520,000, Tuscon joins the City of Phoenix (population 1,626,000) in adopting the new Code. Phoenix likewise moved from the 2011 NEC to the 2017 NEC with an effective date of Sept. 1, 2018. Tucson and Phoenix are the two largest cities in Arizona, and most other major jurisdictions in Arizona are expected to adopt the new codes as well.
Arizona is a home rule state regarding construction code adoption, (i.e., there is no statewide adoption), and each city and county adopts their own codes.