National Electrical Code (NFPA 70) NEC
Wiring, grounding, bonding, raceways, overcurrent protection, and premises wiring for buildings and structures.
Overview
Wiring, grounding, bonding, raceways, overcurrent protection, and premises wiring for buildings and structures.
Publisher
National Fire Protection Association (NFPA)
Latest edition
2023
First published
1897
Cycle
Every 3 years
Why it matters
NEC edition drives GFCI/AFCI coverage, EV-charger rough-in, PV interconnection, and panel sizing. A jump from 2017 → 2023 can meaningfully change a multifamily electrical scope.
Adoption by edition
Each row is one published edition, with the states (and DC) that have adopted it as the statewide minimum. Click a postal code to jump to that state's code wiki.
| Edition | States | Adopting jurisdictions |
|---|---|---|
| 2023 | 28 | CA · CO · CT · GA · HI · ID · IA · KY · MA · MI · MN · NE · NV · NH · NY · ND · OH · OK · OR · RI · SC · TX · UT · VT · WA · WV · WI · WY |
| 2020 | 12 | AL · AK · AR · DE · FL · LA · ME · MT · NJ · NM · PA · VA |
| 2017 | 2 | MS · TN |
| 2008 | 2 | IN · KS |
Local amendments
Amendments are rare compared to the ICC codes — states mostly adopt whole-cloth with a lag.