Current Edition of the National Electrical Code (State-by-State)

NEC Code In Effect 02/01/2025

As of March 1, 2025, the 2023 NEC is in effect in 17 states; the 2020 NEC is in effect in 21 states; the 2017 NEC is in effect in six states; and the 2008 NEC is in effect in two states.

Note: The 2023 edition of the NEC was issued by the NFPA Standards Council on August 12, 2022. The effective date was September 1, 2022, when it officially became available for federal, state, county, and municipal governmental entities to update their electrical installation regulations.

The following table shows the edition of the NEC in effect in those states having a statewide regulation that impacts construction, trade licensing, or both. Follow the link to the board or agency responsible for updating the NEC.

StateCurrent Edition Of The NEC In Effect2020 Or 2023 NEC UPDATE StatusOther Editions Of NEC Update Status
Alabama2020 (7/1/2022), Alabama Division of Construction Management
Alaska2020 (4/16/2020)
ArizonaLocal adoption only
Arkansas2020 with AR amendments (8/1/2022)
California2020 with CA amendments (1/1/2023)2023 update process underway (Projected 1/1/2026)
Colorado2023 (8/1/2023)
Connecticut2020 with CT amendments (10/1/2022)2023 update process underway (Effective date not established)
Delaware2020 (9/1/2021)
Florida2020 (12/31/2023)
Georgia2023 (1/1/2025)
Hawaii2020 (3/14/2023)
Idaho2023 (7/1/2023) with ID amendments (temporary rules permit use of 2017 NEC w/ID amendments)
Illinois2008 (7/1/11 - commercial occupancies for areas outside of local jurisdictions that have adoption authority)
Indiana2008 Commercial with IN amendments (8/26/2009), 2017 (2018 IRC) One- and two-family dwellings with IN amendments (12/26/2019)2023 Update process underway (Effective date not established)
Iowa2020 with IA amendments (4/1/2021)2023 update process underway (Effective date not established
Kansas2008 (2/4/11 - State Fire Marshal)
Kentucky2023 (1/1/2025)
Louisiana2020 (1/1/2023)
Maine2023 with Maine amendments (7/1/2024)
Maryland2017 (2/7/2020)
Massachusetts2023 with MA amendments (2/17/2023)
Michigan2023 Commercial (3/12/2024) 2017 One- and two-family dwellings (2/8/2016)Residential 2023 update process underway (Effective date not established)
Minnesota2023 (7/1/2023)
MississippiLocal adoption only
MissouriLocal adoption only
Montana2020 with MT amendments (6/10/2022)
Nebraska2023 (8/1/2024)
Nevada2017 (7/1/18 - Nevada State Pubic Works Division)
New Hampshire2020 with NH amendments (7/1/2022 with 6-month grace period permitting use of prior adopted edition)2023 update process underway (Projected 7/1/2025)
New Jersey2020 with NJ amendments (9/6/2022)
New Mexico2020 (3/28/2023)
New York2017 (5/12/2020)2023 update process underway (Effective date not established)
North Carolina2020 with NC amendments for other than one- and two-family dwellings (11/1/21)2023 update process underway (Projected 7/1/2025)
North Dakota2023 (7/1/2024)
Ohio2023 Commercial (3/1/2024)
Oklahoma2023 (9/14/2024)
Oregon2023 with OR amendments (10/1/2023)
Pennsylvania2017 (2/14/2022)2020 update process underway (projected 7/13/2025)
Rhode Island2020 (2/1/2022)
South Carolina2020 with SC amendments (1/1/2023)
South Dakota2023 (11/12/2024) with SD amendments
Tennessee2017 (10/1/2018) with TN amendments
Texas2023 (9/1/2023)
Utah2020 Commercial (7/1/2021) with UT amendments 2014
Residential (7/1/2016) with UT amendments
Vermont2020 with VT amendments (4/15/2022)
Virginia2020 (1/18/2024)
Washington2023 (4/1/2024)
West Virginia2020 with WV amendments (8/1/2022)
Wisconsin2017 Commercial (8/1/2018) Residential (1/1/2020)
Wyoming2023 (7/1/2023)
Chicago2017 with Chicago amendments (3/1/2018)
New York City2008 w/NYC amendments (7/1/2011)2020 update process underway (Effective date not established)

E-Brochures related to NEC Articles requiring surge protection.

SegmentDescriptionLink
ALTERNATIVE ENERGYSurge Protectors for NFPA 855, Standard for the Installation of Stationary Energy Storage SystemsLink
ELECTRICALNEC Article 708 Critical Operations Power Systems (COPS)Link
ELECTRICALNEC Article 700 Emergency SystemsLink
ELEVATORSNEC Article 620.51 elevators, dumbwaiters, escalators, moving walks, platform lifts and stairway chairliftsLink
INDUSTRIAL MACHINERYNEC Article 670 Industrial MachineryLink
RESIDENTIALWhat Is The NEC Definition Of A Dwelling Unit?Link

NEC2023 Source: NFPA

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