Throughout the United States and around the world, NFPA 70®, National Electrical Code® (NEC®), published by the National Fire Protection Association (NFPA), sets the foundation for electrical safety in residential, commercial, and industrial occupancies.

Where is the National Electrical Code in effect?

CodeFinder™: Insight you need on NFPA codes and standards.

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. If you have a question on the status of NEC enforcement in any state, please contact Tim McClintock.

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. 

 

NEC in effect map

 

The National Electrical Code process in progress

As of March 1, 2025, 17 states have completed their 2023 NEC update process. Four 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.

 NEC process in progress map

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)

State

Current Edition of the NEC in effect (effective date)

2020 or 2023 NEC UPDATE status (effective date)

Other editions of NEC Update status (effective date)

Alabama

2020 (7/1/2022), Alabama Division of Construction Management

 


Alaska

2020 (4/16/2020)

 


Arizona

Local adoption only 



Arkansas 

2020 with AR amendments (8/1/2022) 

 


California 

2020 with CA amendments (1/1/2023) 

2023 update process underway (Projected 1/1/2026)


Colorado

2023 (8/1/2023)

 


Connecticut

2020 with CT amendments (10/1/2022)

2023 update process underway (Effective date not established)


Delaware

2020 (9/1/2021)

   

Florida

2020 (12/31/2023)

 

 

Georgia 

2023 (1/1/2025)

 


Hawaii 
2020 (3/14/2023)



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 
2020 with IA amendments (4/1/2021)  2023 update process underway (Effective date not established)  
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 underway (Effective date not established)  
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 (Projected 7/1/2025)  
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 (Projected 7/1/2025)  
North Dakota 
 
2023 (7/1/2024)    
Ohio 
 

2023
Commercial (3/1/2024)

Residential with OH amendments (4/15/2024)

   
Oklahoma 
 
2023 (9/14/2024)

 
Oregon 
 
2023 with OR amendments (10/1/2023)
 
   
Pennsylvania
 
2017 (2/14/2022)
 
 2020 update process underway (projected 7/13/2025)  
Rhode Island 
 
2020 (2/1/2022)
 

 
South Carolina
2020 with SC amendments (1/1/2023)
   
South Dakota 
 
2023 (11/12/2024) with SD amendments
 
   
Tennessee
2017 (10/1/2018) with TN amendments


 
Texas
2023 (9/1/2023)

   
Utah

2020
Commercial (7/1/2021) with UT amendments

2014
Residential (7/1/2016) with UT amendments

   
Vermont
2020 with VT amendments (4/15/2022)
   
Virginia
2020 (1/18/2024)
 
   
Washington 2023 (4/1/2024)

   
West Virginia
2020 with WV amendments (8/1/2022)

   
Wisconsin
2017
Commercial (8/1/2018)
Residential (1/1/2020)

 
Wyoming
2023 (7/1/2023)

   
Chicago 2017 with Chicago amendments (3/1/2018)
 
New York City
2008 w/NYC amendments (7/1/2011)
2020 update process underway (Effective date not established)

 

Additional code support information

The Electrical Code Coalition, which is comprised of electrical and safety organizations, provides resources to promote the use of the most current edition of NFPA 70®, National Electrical Code® (NEC®). For more information about the Electrical Code Coalition, visit NFPA Xchange™.

 
2011 (Effective date not established)
Texas 2014 (9/1/2014) Adoption process underway (9/1/17)