NEC Adoption by State

State	NEC Edition	Notes	Sources
Alabama (AL)	2020	Alabama currently enforces the 2020 NEC statewide. Local jurisdictions may have amendments or administrative differences, but the statewide electrical code is based on NEC 2020.	[1][2][3]
Alaska (AK)	2020	Alaska currently enforces the 2020 NEC statewide. Some jurisdictions may apply local amendments, but Alaska has a statewide electrical code based on the NEC rather than leaving adoption entirely to cities.	[1][2][3]
Arizona (AZ)	2023	No clear evidence of a single statewide Arizona NEC adoption was provided in the search results. Arizona commonly uses local jurisdiction adoption rather than a uniform statewide electrical code mandate. Phoenix materials show adoption/amendments to the 2023 NEC, so 2023 appears to be the most commonly enforced current edition in major jurisdictions based on the provided sources. Local variations may apply.	[1][2][3]
Arkansas (AR)	2023	Arkansas statewide enforces the 2023 NEC. Arkansas adopted the 2023 edition by rule, with state amendments/exceptions, including continued exclusion of 210.8(F) GFCI requirements for HVAC equipment and amendments to Article 200.	[1][2][3]
California (CA)	2023	California enforces the California Electrical Code (Title 24, Part 3), which adopts the NEC with state amendments rather than using the NEC verbatim. The 2025 California Electrical Code is based on NFPA 70 (2023). Local jurisdictions may also apply additional local amendments.	[1][2][3]
Colorado (CO)	2023	Colorado currently enforces the 2023 NEC statewide. Local jurisdictions may adopt amendments or have local administrative variations, but the statewide base code is the 2023 NEC.	[1][2][3]
Connecticut (CT)	2020	Connecticut currently enforces the 2020 NEC statewide as part of the 2022 code cycle. Search results indicate it became effective statewide on 2022-10-01. The state is preparing newer code updates for a future cycle, but the current statewide NEC remains 2020 until those take effect.	[1][2][3]
Delaware (DE)	2023	Delaware statewide adopted the 2023 NEC, effective January 1, 2026, by action of the Delaware Fire Prevention Commission in October 2025. Delaware had previously enforced the 2020 NEC since 2021. Local amendments may apply.	[1][2][3]
Florida (FL)	2023	Florida has statewide adoption. Search results indicate Florida enforces the 8th Edition Florida Building Code, which is based on the 2023 NEC, with state amendments. Local jurisdictions may have administrative amendments but not a different statewide NEC edition.	[1][2][3]
Georgia (GA)	2023	Georgia statewide enforces the 2023 NEC with Georgia amendments. Sources indicate the Department of Community Affairs adopted the 2026 Georgia Amendments to the 2023 National Electrical Code effective statewide. Local jurisdictions may also apply local amendments or administrative procedures, but the statewide NEC edition is 2023.	[1][2][3]
Hawaii (HI)	2023	Hawaii currently enforces the 2023 NEC statewide. Source results indicate Hawaii CEU/NEC adoption information through IAEI, and no contrary statewide edition is shown in the provided results. Local amendments may apply.	[1][2][3]
Idaho (ID)	2023	Idaho currently enforces the 2023 NEC statewide, with state amendments possible through the Idaho Building Code Board. Search results also indicate Idaho follows a regular three-year update cycle.	[1][2][3]
Illinois (IL)	2023	Illinois enforces the 2023 NEC statewide. Local jurisdictions may adopt amendments or maintain additional requirements; some municipalities historically had their own electrical codes, so verify city-specific rules for projects in places like Chicago.	[1][2][3]
Indiana (IN)	2017	Indiana uses a split statewide adoption: 2008 NEC for commercial/industrial work and 2017 NEC for residential (effective 2019). Because there is not a single uniform statewide NEC edition and 2017 is the newer/current statewide residential standard, use 2017 with note of the commercial exception. Sources indicate a 2023 update process is underway.	[1][2][3]
Iowa (IA)	2023	Iowa currently enforces the 2023 NEC statewide. Search results indicate it became effective July 1, 2025. A 2026 Iowa bill also references updating Iowa's electrical code to the 2023 NEC, consistent with this adoption. Local amendments may apply, but the statewide edition in effect is 2023.	[1][2][3]
Kansas (KS)	2017	Kansas generally enforces the 2017 NEC statewide through the State Fire Marshal for many building types, with local jurisdictions able to adopt and amend their own codes. State property documents also reference NFPA 70, 2017 edition. Local variations may apply; verify city/county amendments.	[1][2][3]
Kentucky (KY)	2020	Kentucky currently enforces the 2020 NEC statewide. Local jurisdictions may have administrative amendments, but the statewide electrical code is based on the 2020 edition.	[1][2][3]
Louisiana (LA)	2020	Louisiana currently enforces the 2020 NEC statewide. Local amendments may apply in some jurisdictions, but the statewide code is the 2020 edition.	[1][2][3]
Maine (ME)	2023	Maine currently enforces the 2023 NEC statewide. Training listings for 2026 NEC updates do not indicate statewide adoption of 2026. Local amendments may still apply by jurisdiction.	[1][2][3]
Maryland (MD)	2023	Maryland currently enforces the 2023 NEC statewide. The Maryland code matrix dated 2023-08-09 shows the state using 2023 NEC for electrical code adoption. Local jurisdictions may have administrative amendments, but the statewide electrical code edition is 2023.	[1][2][3]
Massachusetts (MA)	2023	Massachusetts enforces a state-specific electrical code at 527 CMR 12.00 based on the NEC with Massachusetts amendments. A 2026 update is only pending/expected; current statewide enforcement is the 2023 NEC as amended by Massachusetts.	[1][2][3]
Michigan (MI)	2023	Michigan currently enforces the 2023 Michigan Electrical Code statewide, which is based on the 2023 NEC with state amendments. Local jurisdictions may have administrative differences, but the electrical code is adopted at the state level.	[1][2][3]
Minnesota (MN)	2023	Minnesota currently enforces the 2023 NEC statewide with Minnesota amendments. The state is already reviewing the 2026 NEC for possible future adoption, which indicates 2026 is not yet in effect.	[1][2][3]
Mississippi (MS)	2023	Mississippi statewide adoption appears to be NEC 2023, enforced by the State Fire Marshal’s Office, with minor jurisdictional modifications. Source 1 states it applies statewide to commercial, residential, industrial, and institutional buildings.	[1][2][3]
Missouri (MO)	2023	No statewide NEC adoption in Missouri; electrical code is adopted locally by cities/counties. Based on major jurisdictions, 2023 is currently the most commonly enforced edition in key areas such as St. Louis City, St. Louis County, and some suburbs. Smaller jurisdictions may still use 2020 or 2017, so verify locally.	[1][2][3]
Montana (MT)	2020	Montana statewide adopts the 2020 NEC with state amendments under ARM Title 24, Chapter 301. Source excerpts indicate statewide code adoption; local amendments may still apply in some jurisdictions.	[1][2][3]
Nebraska (NE)	2023	Nebraska currently enforces the 2023 NEC statewide through the Nebraska Electrical Code, with state amendments. Source indicates effective August 1, 2024. A 2026 bill (LB726) was introduced to update NEC references, but it is not the current code in effect.	[1][2][3]
Nevada (NV)	2023	Nevada currently enforces the 2023 NEC statewide for public works/electrical code. UpCodes indicates Nevada adopted NFPA 70, 2023 without amendments. Local jurisdictions may still have administrative/local requirements, but the statewide adopted NEC edition is 2023.	[1][2][3]
New Hampshire (NH)	2020	New Hampshire statewide adopted the 2020 NEC with state amendments. A state bulletin says the 2020 NEC amendments were put into effect on 2022-07-01, with a six-month grace period allowing either 2017 or 2020 initially. A 2025 notice mentions future 2026 NEC update training requirements, but that does not indicate current statewide enforcement of a newer NEC edition.	[1][2][3]
New Jersey (NJ)	2023	New Jersey currently enforces the 2023 NEC statewide under the Uniform Construction Code, with state amendments possible. Search results indicate NJ has moved beyond older editions; local jurisdictions generally follow the statewide code rather than adopting separate municipal electrical codes.	[1][2][3]
New Mexico (NM)	2020	New Mexico statewide enforces the 2020 NEC through the 2020 New Mexico Electrical Code, with state amendments. Source indicates NFPA 70 (2020) is adopted statewide; local jurisdictions may have amendments but the statewide base code is 2020.	[1][2][3]
New York (NY)	2023	New York has adopted the 2023 NEC through the 2025 Uniform Code. State sources indicate the 2025 NYS Uniform Code takes effect on 2025-12-31. Use 2023 NEC statewide; local amendments may still apply.	[1][2][3]
North Carolina (NC)	2020	North Carolina currently enforces the 2020 NEC statewide as part of the NC State Building Code, with state amendments. Search results suggest a 2025 update notice exists, but the provided source content was inaccessible, so no later statewide effective NEC edition could be confirmed from the results given.	[1][2][3]
North Dakota (ND)	2023	North Dakota statewide adoption is the 2023 NEC. Source indicates the state approved the 2023 Laws, Rules, and Wiring Standards including the 2023 National Electrical Code. Local amendments may still apply.	[1][2][3]
Ohio (OH)	2023	Ohio currently enforces the 2023 NEC statewide. Search results indicate it replaced the 2017 NEC, with Ohio-specific amendments possible at the state or local level.	[1][2][3]
Oklahoma (OK)	2023	Oklahoma statewide adoption is the 2023 NEC via permanent rule by the Oklahoma Uniform Building Code Commission. It superseded the 2020 NEC. State amendments may apply.	[1][2][3]
Oregon (OR)	2023	Oregon currently enforces the 2023 Oregon Electrical Specialty Code (OESC), which is based on the 2023 NEC, with Oregon-specific amendments. The state has begun the adoption process for the 2026 OESC, but that is only anticipated for Oct. 1, 2026 and is not yet in effect.	[1][2][3]
Pennsylvania (PA)	2020	Pennsylvania statewide enforcement is the 2020 NEC. Multiple sources indicate it took effect July 13, 2025. Philadelphia may have related local building code updates, but the statewide NEC adoption is 2020; use statewide code unless a local jurisdiction has specific amendments.	[1][2][3]
Rhode Island (RI)	2023	Rhode Island is adopting the RI Electrical Code based on the 2023 NEC. Source provided indicates this update is effective December 1, 2025. Earlier general state-adoption trackers may be outdated; statewide enforcement should be 2023 NEC from that effective date, subject to Rhode Island amendments.	[1][2][3]
South Carolina (SC)	2020	South Carolina enforces the NEC statewide through Chapter 8, Article 11 of the South Carolina Code of Regulations, with state amendments. Source listings indicate the state is on the 2020 NEC. Local jurisdictions may apply administrative requirements or amendments, but this is the current statewide edition.	[1][2][3]
South Dakota (SD)	2023	South Dakota currently enforces the 2023 NEC statewide. IAEI’s South Dakota NEC adoption/CEU page indicates the state uses the 2023 edition. Local amendments may apply, but there is statewide adoption rather than a no-adoption/local-only system.	[1][2][3]
Tennessee (TN)	2023	Tennessee State Fire Marshal’s Office code adoption update effective 2025-04-17 includes NFPA 70, National Electrical Code, 2023 edition, as the statewide minimum code. Local jurisdictions may administer enforcement and may have local amendments or procedures, but the statewide adopted NEC is 2023.	[1][2][3]
Texas (TX)	2023	Texas currently enforces the 2023 NEC statewide. Local jurisdictions may adopt amendments or additional requirements, so city-specific rules can vary.	[1][2][3]
Utah (UT)	2020	Utah currently enforces the 2020 NEC statewide for non-residential installations, with statewide amendments. Residential electrical standards follow the IRC rather than the NEC (sources indicate 2014-based residential provisions). Utah code page shown was effective 2024-02-16 and notes it was superseded 2025-07-01, but the search results provided do not clearly show a newer statewide NEC edition taking effect after that.	[1][2][3]
Vermont (VT)	2023	Vermont currently enforces the 2025 Vermont Fire & Building Safety Code, effective 2025-11-04, which adopts the 2023 NEC statewide with Vermont amendments. Prior to that effective date, Vermont was on an earlier edition; use the 2023 NEC for current statewide enforcement going forward.	[1][2][3]
Virginia (VA)	2020	Virginia statewide enforces the 2021 Virginia Uniform Statewide Building Code, which references the 2020 NEC. Effective statewide; local jurisdictions enforce the state code with Virginia-specific amendments.	[1][2][3]
Washington (WA)	2023	Washington currently enforces the 2023 NEC statewide. State rulemaking materials indicate the 2026 NEC is only proposed and would replace the current 2023 edition when adopted. Local amendments may apply, but the statewide code is 2023 at present.	[1][2][3]
West Virginia (WV)	2023	West Virginia currently enforces the 2023 NEC statewide. Local jurisdictions may apply administrative procedures or amendments, so verify with the authority having jurisdiction for project-specific requirements.	[1][2][3]
Wisconsin (WI)	2017	Wisconsin currently enforces the 2017 NEC statewide through its electrical code rules, with state amendments. A 2026 rulemaking appears in the legislature materials, indicating possible future updates, but the currently effective statewide edition in the provided results is 2017.	[1][2][3]
Wyoming (WY)	2023	Wyoming currently enforces the 2023 NEC statewide, according to current NEC adoption trackers. Wyoming allows local amendments and interpretations, so some jurisdictions may vary in enforcement details.	[1][2][3]

State

NEC Edition

Notes

Sources

Alabama (AL)

2020

Alabama currently enforces the 2020 NEC statewide. Local jurisdictions may have amendments or administrative differences, but the statewide electrical code is based on NEC 2020.

[1][2][3]

Alaska (AK)

2020

Alaska currently enforces the 2020 NEC statewide. Some jurisdictions may apply local amendments, but Alaska has a statewide electrical code based on the NEC rather than leaving adoption entirely to cities.

[1][2][3]

Arizona (AZ)

2023

No clear evidence of a single statewide Arizona NEC adoption was provided in the search results. Arizona commonly uses local jurisdiction adoption rather than a uniform statewide electrical code mandate. Phoenix materials show adoption/amendments to the 2023 NEC, so 2023 appears to be the most commonly enforced current edition in major jurisdictions based on the provided sources. Local variations may apply.

[1][2][3]

Arkansas (AR)

2023

Arkansas statewide enforces the 2023 NEC. Arkansas adopted the 2023 edition by rule, with state amendments/exceptions, including continued exclusion of 210.8(F) GFCI requirements for HVAC equipment and amendments to Article 200.

[1][2][3]

California (CA)

2023

California enforces the California Electrical Code (Title 24, Part 3), which adopts the NEC with state amendments rather than using the NEC verbatim. The 2025 California Electrical Code is based on NFPA 70 (2023). Local jurisdictions may also apply additional local amendments.

[1][2][3]

Colorado (CO)

2023

Colorado currently enforces the 2023 NEC statewide. Local jurisdictions may adopt amendments or have local administrative variations, but the statewide base code is the 2023 NEC.

[1][2][3]

Connecticut (CT)

2020

Connecticut currently enforces the 2020 NEC statewide as part of the 2022 code cycle. Search results indicate it became effective statewide on 2022-10-01. The state is preparing newer code updates for a future cycle, but the current statewide NEC remains 2020 until those take effect.

[1][2][3]

Delaware (DE)

2023

Delaware statewide adopted the 2023 NEC, effective January 1, 2026, by action of the Delaware Fire Prevention Commission in October 2025. Delaware had previously enforced the 2020 NEC since 2021. Local amendments may apply.

[1][2][3]

Florida (FL)

2023

Florida has statewide adoption. Search results indicate Florida enforces the 8th Edition Florida Building Code, which is based on the 2023 NEC, with state amendments. Local jurisdictions may have administrative amendments but not a different statewide NEC edition.

[1][2][3]

Georgia (GA)

2023

Georgia statewide enforces the 2023 NEC with Georgia amendments. Sources indicate the Department of Community Affairs adopted the 2026 Georgia Amendments to the 2023 National Electrical Code effective statewide. Local jurisdictions may also apply local amendments or administrative procedures, but the statewide NEC edition is 2023.

[1][2][3]

Hawaii (HI)

2023

Hawaii currently enforces the 2023 NEC statewide. Source results indicate Hawaii CEU/NEC adoption information through IAEI, and no contrary statewide edition is shown in the provided results. Local amendments may apply.

[1][2][3]

Idaho (ID)

2023

Idaho currently enforces the 2023 NEC statewide, with state amendments possible through the Idaho Building Code Board. Search results also indicate Idaho follows a regular three-year update cycle.

[1][2][3]

Illinois (IL)

2023

Illinois enforces the 2023 NEC statewide. Local jurisdictions may adopt amendments or maintain additional requirements; some municipalities historically had their own electrical codes, so verify city-specific rules for projects in places like Chicago.

[1][2][3]

Indiana (IN)

2017

Indiana uses a split statewide adoption: 2008 NEC for commercial/industrial work and 2017 NEC for residential (effective 2019). Because there is not a single uniform statewide NEC edition and 2017 is the newer/current statewide residential standard, use 2017 with note of the commercial exception. Sources indicate a 2023 update process is underway.

[1][2][3]

Iowa (IA)

2023

Iowa currently enforces the 2023 NEC statewide. Search results indicate it became effective July 1, 2025. A 2026 Iowa bill also references updating Iowa's electrical code to the 2023 NEC, consistent with this adoption. Local amendments may apply, but the statewide edition in effect is 2023.

[1][2][3]

Kansas (KS)

2017

Kansas generally enforces the 2017 NEC statewide through the State Fire Marshal for many building types, with local jurisdictions able to adopt and amend their own codes. State property documents also reference NFPA 70, 2017 edition. Local variations may apply; verify city/county amendments.

[1][2][3]

Kentucky (KY)

2020

Kentucky currently enforces the 2020 NEC statewide. Local jurisdictions may have administrative amendments, but the statewide electrical code is based on the 2020 edition.

[1][2][3]

Louisiana (LA)

2020

Louisiana currently enforces the 2020 NEC statewide. Local amendments may apply in some jurisdictions, but the statewide code is the 2020 edition.

[1][2][3]

Maine (ME)

2023

Maine currently enforces the 2023 NEC statewide. Training listings for 2026 NEC updates do not indicate statewide adoption of 2026. Local amendments may still apply by jurisdiction.

[1][2][3]

Maryland (MD)

2023

Maryland currently enforces the 2023 NEC statewide. The Maryland code matrix dated 2023-08-09 shows the state using 2023 NEC for electrical code adoption. Local jurisdictions may have administrative amendments, but the statewide electrical code edition is 2023.

[1][2][3]

Massachusetts (MA)

2023

Massachusetts enforces a state-specific electrical code at 527 CMR 12.00 based on the NEC with Massachusetts amendments. A 2026 update is only pending/expected; current statewide enforcement is the 2023 NEC as amended by Massachusetts.

[1][2][3]

Michigan (MI)

2023

Michigan currently enforces the 2023 Michigan Electrical Code statewide, which is based on the 2023 NEC with state amendments. Local jurisdictions may have administrative differences, but the electrical code is adopted at the state level.

[1][2][3]

Minnesota (MN)

2023

Minnesota currently enforces the 2023 NEC statewide with Minnesota amendments. The state is already reviewing the 2026 NEC for possible future adoption, which indicates 2026 is not yet in effect.

[1][2][3]

Mississippi (MS)

2023

Mississippi statewide adoption appears to be NEC 2023, enforced by the State Fire Marshal’s Office, with minor jurisdictional modifications. Source 1 states it applies statewide to commercial, residential, industrial, and institutional buildings.

[1][2][3]

Missouri (MO)

2023

No statewide NEC adoption in Missouri; electrical code is adopted locally by cities/counties. Based on major jurisdictions, 2023 is currently the most commonly enforced edition in key areas such as St. Louis City, St. Louis County, and some suburbs. Smaller jurisdictions may still use 2020 or 2017, so verify locally.

[1][2][3]

Montana (MT)

2020

Montana statewide adopts the 2020 NEC with state amendments under ARM Title 24, Chapter 301. Source excerpts indicate statewide code adoption; local amendments may still apply in some jurisdictions.

[1][2][3]

Nebraska (NE)

2023

Nebraska currently enforces the 2023 NEC statewide through the Nebraska Electrical Code, with state amendments. Source indicates effective August 1, 2024. A 2026 bill (LB726) was introduced to update NEC references, but it is not the current code in effect.

[1][2][3]

Nevada (NV)

2023

Nevada currently enforces the 2023 NEC statewide for public works/electrical code. UpCodes indicates Nevada adopted NFPA 70, 2023 without amendments. Local jurisdictions may still have administrative/local requirements, but the statewide adopted NEC edition is 2023.

[1][2][3]

New Hampshire (NH)

2020

New Hampshire statewide adopted the 2020 NEC with state amendments. A state bulletin says the 2020 NEC amendments were put into effect on 2022-07-01, with a six-month grace period allowing either 2017 or 2020 initially. A 2025 notice mentions future 2026 NEC update training requirements, but that does not indicate current statewide enforcement of a newer NEC edition.

[1][2][3]

New Jersey (NJ)

2023

New Jersey currently enforces the 2023 NEC statewide under the Uniform Construction Code, with state amendments possible. Search results indicate NJ has moved beyond older editions; local jurisdictions generally follow the statewide code rather than adopting separate municipal electrical codes.

[1][2][3]

New Mexico (NM)

2020

New Mexico statewide enforces the 2020 NEC through the 2020 New Mexico Electrical Code, with state amendments. Source indicates NFPA 70 (2020) is adopted statewide; local jurisdictions may have amendments but the statewide base code is 2020.

[1][2][3]

New York (NY)

2023

New York has adopted the 2023 NEC through the 2025 Uniform Code. State sources indicate the 2025 NYS Uniform Code takes effect on 2025-12-31. Use 2023 NEC statewide; local amendments may still apply.

[1][2][3]

North Carolina (NC)

2020

North Carolina currently enforces the 2020 NEC statewide as part of the NC State Building Code, with state amendments. Search results suggest a 2025 update notice exists, but the provided source content was inaccessible, so no later statewide effective NEC edition could be confirmed from the results given.

[1][2][3]

North Dakota (ND)

2023

North Dakota statewide adoption is the 2023 NEC. Source indicates the state approved the 2023 Laws, Rules, and Wiring Standards including the 2023 National Electrical Code. Local amendments may still apply.

[1][2][3]

Ohio (OH)

2023

Ohio currently enforces the 2023 NEC statewide. Search results indicate it replaced the 2017 NEC, with Ohio-specific amendments possible at the state or local level.

[1][2][3]

Oklahoma (OK)

2023

Oklahoma statewide adoption is the 2023 NEC via permanent rule by the Oklahoma Uniform Building Code Commission. It superseded the 2020 NEC. State amendments may apply.

[1][2][3]

Oregon (OR)

2023

Oregon currently enforces the 2023 Oregon Electrical Specialty Code (OESC), which is based on the 2023 NEC, with Oregon-specific amendments. The state has begun the adoption process for the 2026 OESC, but that is only anticipated for Oct. 1, 2026 and is not yet in effect.

[1][2][3]

Pennsylvania (PA)

2020

Pennsylvania statewide enforcement is the 2020 NEC. Multiple sources indicate it took effect July 13, 2025. Philadelphia may have related local building code updates, but the statewide NEC adoption is 2020; use statewide code unless a local jurisdiction has specific amendments.

[1][2][3]

Rhode Island (RI)

2023

Rhode Island is adopting the RI Electrical Code based on the 2023 NEC. Source provided indicates this update is effective December 1, 2025. Earlier general state-adoption trackers may be outdated; statewide enforcement should be 2023 NEC from that effective date, subject to Rhode Island amendments.

[1][2][3]

South Carolina (SC)

2020

South Carolina enforces the NEC statewide through Chapter 8, Article 11 of the South Carolina Code of Regulations, with state amendments. Source listings indicate the state is on the 2020 NEC. Local jurisdictions may apply administrative requirements or amendments, but this is the current statewide edition.

[1][2][3]

South Dakota (SD)

2023

South Dakota currently enforces the 2023 NEC statewide. IAEI’s South Dakota NEC adoption/CEU page indicates the state uses the 2023 edition. Local amendments may apply, but there is statewide adoption rather than a no-adoption/local-only system.

[1][2][3]

Tennessee (TN)

2023

Tennessee State Fire Marshal’s Office code adoption update effective 2025-04-17 includes NFPA 70, National Electrical Code, 2023 edition, as the statewide minimum code. Local jurisdictions may administer enforcement and may have local amendments or procedures, but the statewide adopted NEC is 2023.

[1][2][3]

Texas (TX)

2023

Texas currently enforces the 2023 NEC statewide. Local jurisdictions may adopt amendments or additional requirements, so city-specific rules can vary.

[1][2][3]

Utah (UT)

2020

Utah currently enforces the 2020 NEC statewide for non-residential installations, with statewide amendments. Residential electrical standards follow the IRC rather than the NEC (sources indicate 2014-based residential provisions). Utah code page shown was effective 2024-02-16 and notes it was superseded 2025-07-01, but the search results provided do not clearly show a newer statewide NEC edition taking effect after that.

[1][2][3]

Vermont (VT)

2023

Vermont currently enforces the 2025 Vermont Fire & Building Safety Code, effective 2025-11-04, which adopts the 2023 NEC statewide with Vermont amendments. Prior to that effective date, Vermont was on an earlier edition; use the 2023 NEC for current statewide enforcement going forward.

[1][2][3]

Virginia (VA)

2020

Virginia statewide enforces the 2021 Virginia Uniform Statewide Building Code, which references the 2020 NEC. Effective statewide; local jurisdictions enforce the state code with Virginia-specific amendments.

[1][2][3]

Washington (WA)

2023

Washington currently enforces the 2023 NEC statewide. State rulemaking materials indicate the 2026 NEC is only proposed and would replace the current 2023 edition when adopted. Local amendments may apply, but the statewide code is 2023 at present.

[1][2][3]

West Virginia (WV)

2023

West Virginia currently enforces the 2023 NEC statewide. Local jurisdictions may apply administrative procedures or amendments, so verify with the authority having jurisdiction for project-specific requirements.

[1][2][3]

Wisconsin (WI)

2017

Wisconsin currently enforces the 2017 NEC statewide through its electrical code rules, with state amendments. A 2026 rulemaking appears in the legislature materials, indicating possible future updates, but the currently effective statewide edition in the provided results is 2017.

[1][2][3]

Wyoming (WY)

2023

Wyoming currently enforces the 2023 NEC statewide, according to current NEC adoption trackers. Wyoming allows local amendments and interpretations, so some jurisdictions may vary in enforcement details.

[1][2][3]

Why NEC Edition Matters

The edition of the NEC your state enforces directly affects what you can and cannot install. Each new edition introduces updated requirements for arc-fault circuit interrupter (AFCI) protection, ground-fault circuit interrupter (GFCI) locations, electric vehicle (EV) charging infrastructure, and energy storage systems. A project designed to NEC 2023 requirements may not pass inspection in a jurisdiction still on NEC 2020 if newer provisions were relied upon, and vice versa. For electrical contractors working across state lines, knowing which edition applies in each jurisdiction is essential for accurate estimates, correct material selection, and passing inspection on the first visit.

How NEC Adoption Works

The NEC is published by the National Fire Protection Association (NFPA) on a three-year cycle. However, the NEC is a model code — it has no legal force until a state or local government formally adopts it. The adoption process varies by state. Some states adopt via legislation, others through administrative rulemaking by a state board or commission. Many states adopt the NEC with amendments that modify or delete specific sections to reflect local conditions, construction practices, or political priorities. This process typically introduces a lag of one to four years between publication of a new edition and its enforcement at the state level. Local authorities having jurisdiction (AHJs) — cities, counties, and fire districts — may adopt a different edition than the state, or enforce additional local amendments. Always verify the edition in effect with the AHJ where the work will be performed.

Key Changes Between NEC Editions

Each edition of the NEC builds on the previous one. Here are the most significant changes electricians and contractors should be aware of:

NEC 2020: Expanded GFCI requirements to 250-volt outlets, added provisions for energy storage systems (Article 706), broadened outdoor emergency disconnects for one- and two-family dwellings, and updated surge protection requirements.
NEC 2023: New Article 750 for Energy Management Systems, expanded EV charging infrastructure rules, updated load calculation methods for dwelling units (Article 220), strengthened arc-energy reduction requirements for services, and revised GFCI protection for 240-volt appliances including dishwashers and electric ranges.
NEC 2026: Updated requirements for bidirectional power systems and microgrids, enhanced provisions for battery energy storage integration, streamlined EV charging installation standards, and refined AFCI/GFCI coordination requirements for modern electrical systems.

Why NEC Edition Matters

How NEC Adoption Works

Key Changes Between NEC Editions

More resources

Working across state lines?