Where is the National Electrical Code in effect?
As of July 1, 2025, the 2023 NEC is in effect in 18 states; the 2020 NEC is in effect in 20 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 2022 California Electrical Code, California Code of Regulations Title 24, Part 3 is based on the 2020 edition of NFPA 70®, National Electrical Code®.
- The 2018 Chicago Electrical Code is based on the 2017 edition of NFPA 70®, National Electrical Code®
- The 2011 New York City Electrical Code is based on the 2008 edition of NFPA 70®, National Electrical Code®
The National Electrical Code process in progress
As of July 1, 2025, 19 states have completed their 2023 NEC update process. Six states currently using the 2020 NEC, two using the 2017 NEC, and one using the 2008 NEC have commenced the process of revising the statute or administrative rule through which the NEC is updated to reference the 2023 edition. One state currently using the 2017 NEC is in the process of updating to the 2020 NEC. To determine the current edition of the NEC being used in a state, see the NEC in effect map.
Note: The 2023 edition of the NEC was issued by the NFPA Standards Council on August 12, 2022. The effective date of September 1, 2022 is when it officially became available for federal, state, county, and municipal governmental entities to update their electrical installation regulations.
State-by-State
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.
| 2011 (Effective date not established) | ||
| Texas | 2014 (9/1/2014) | Adoption process underway (9/1/17) |
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State |
Current Edition Of The NEC In Effect (Effective Date) |
2020 Or 2023 NEC UPDATE Status (Effective Date) |
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2020 (7/1/2022), Alabama Division of Construction Management |
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2020 (4/16/2020) |
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Arizona |
Local adoption only |
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2020 with AR amendments (8/1/2022) |
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2020 with CA amendments (1/1/2023) |
2023 update process complete (1/1/2026) |
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2023 (8/1/2023) |
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2020 with CT amendments (10/1/2022) |
2023 update process underway (Effective date not established) |
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2020 (9/1/2021) |
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2020 (12/31/2023) |
2023 update process underway (Effective date not established) |
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2023 (1/1/2025) |
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| Hawaii | 2020 (3/14/2023) |
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| Idaho | 2023 (7/1/2023) with ID amendments (temporary rules permit use of 2017 NEC w/ID amendments) | ||
| Illinois | 2008 (7/1/11 - commercial occupancies for areas outside of local jurisdictions that have adoption authority) | ||
| Indiana |
2008 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) | |
| Iowa | 2023 with IA amendments (7/1/2025) | ||
| Kansas | 2008 (2/4/11 - State Fire Marshal) | ||
| Kentucky |
2023 (1/1/2025) | ||
| Louisiana | 2020 (1/1/2023) | ||
| Maine | 2023 with Maine amendments (7/1/2024) | ||
| Maryland | 2017 (2/7/2020) | ||
| Massachusetts | 2023 with MA amendments (2/17/2023) | ||
| Michigan | 2023 Commercial (3/12/2024) 2017 One- and two-family dwellings (2/8/2016) |
Residential 2023 update process complete (8/29/2025) | |
| Minnesota |
2023 (7/1/2023) | ||
| Mississippi | Local adoption only | ||
| Missouri | Local adoption only | ||
| Montana | 2020 with MT amendments (6/10/2022) | ||
| Nebraska |
2023 (8/1/2024) | ||
| Nevada | 2017 (7/1/18 - Nevada State Pubic Works Division) | ||
| New Hampshire | 2020 with NH amendments (7/1/2022 with 6-month grace period permitting use of prior adopted edition) | 2023 update process underway (Effective date not established) | |
| New Jersey | 2020 with NJ amendments (9/6/2022) | ||
| New Mexico | 2020 (3/28/2023) | ||
| New York | 2017 (5/12/2020) | 2023 update process underway (Effective date not established) | |
| North Carolina |
2020 with NC amendments for other than one- and two-family dwellings (11/1/21) | 2023 update process underway (Expected date not established) | |
| North Dakota |
2023 (7/1/2024) | ||
| Ohio |
2023 Residential with OH amendments (4/15/2024) |
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| Oklahoma |
2023 (9/14/2024) |
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| Oregon |
2023 with OR amendments (10/1/2023) |
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| Pennsylvania |
2017 (2/14/2022) |
2020 update process underway (projected 7/13/2025) | |
| Rhode Island |
2020 (2/1/2022) |
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| South Carolina | 2020 with SC amendments (1/1/2023) | 2023 update process underway (Projected 8/4/2025) | |
| South Dakota |
2023 (11/12/2024) with SD amendments |
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| Tennessee | 2017 (10/1/2018) with TN amendments |
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| Texas | 2023 (9/1/2023) |
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| Utah |
2020 2014 |
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| Vermont | 2020 with VT amendments (4/15/2022) | ||
| Virginia | 2020 (1/18/2024) |
2023 update process underway (Effective date not established) | |
| Washington | 2023 (4/1/2024) |
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| West Virginia | 2020 with WV amendments (8/1/2022) |
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| Wisconsin | 2017 Commercial (8/1/2018) Residential (1/1/2020) |
2023 update process underway (Effective date not established) | |
| Wyoming | 2023 (7/1/2023) |
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| Chicago | 2017 with Chicago amendments (3/1/2018) | ||
| New York City | 2008 w/NYC amendments (7/1/2011) | 2020 update process underway (Projected 12/21/2025) |