An installer based in Fairfield County can pull a permit in Greenwich in the morning, one in Westchester at lunch, and one in Springfield by the end of the week. That is three states and, right now, three National Electrical Code editions. The NEC edition by state is not trivia for a multi-state shop. It is the first line a reviewer reads.
Here is where the editions sit for the three states where we see the most mix-ups, and how to keep templates from carrying the wrong one across a border.
NEC edition by state: Massachusetts, New York, Connecticut
- Massachusetts: 2026 NEC. 527 CMR 12.00, the Massachusetts Electrical Code, adopts the 2026 NEC with Massachusetts amendments. It took effect April 24, 2026. Massachusetts is one of the first states on the 2026 edition.
- New York State: 2023 NEC. Outside New York City, the state Uniform Code references the 2023 NEC.
- New York City: its own code. The five boroughs enforce the New York City Electrical Code, not the state Uniform Code. Use a separate template.
- Connecticut: 2020 NEC. The 2022 Connecticut State Building Code, in effect since October 1, 2022, adopts the 2020 NEC with state amendments.
For Rhode Island and Pennsylvania, confirm the edition the local code official enforces before you file, and put that edition on the cover. In Pennsylvania especially, the Uniform Construction Code is administered locally, so ask the municipality or its third-party agency.
What actually changes between editions on a solar set
The articles a solar designer lives in keep their numbers: 690 for PV systems, 705 for interconnected sources, 706 for storage, 625 for EV charging. What moves between editions is the inside of those articles. Subsections get renumbered, exceptions change, and new requirements appear. A note that cites "705.12(B)(2)(3)(b)" might be right in one edition and point to nothing in another.
Two rules keep a set clean across states:
- Cite to the edition on the cover. Every code reference in the notes should exist in the edition the cover names. If you are not sure, cite the article and the requirement in words rather than a subsection number from memory.
- Do not import a requirement the state has not adopted. A 2026 NEC detail drawn into a Connecticut set is not a bonus. It is a note the reviewer has to read, check against the 2020 edition, and question.
One template per state, not one template with edits
Most edition mistakes come from a single master template that someone edits for each job. The cover gets updated. The general notes on sheet E-1 do not. Then a Massachusetts reviewer sees "2023 NEC" in a corner and sends it back. Our post on the Lynn Massachusetts solar permit shows exactly that rejection.
Build separate templates and lock them:
- Title block. State, code edition, and effective date printed on every sheet, not just the cover.
- General notes. Written for that state's edition and amendments.
- Label schedule. Label wording follows the edition in force in that state.
- Fire access notes. Tied to the state fire code and any local amendment, with widths written out.
Search each PDF for the other states' edition years before upload. It takes one minute. The solar permit rejection reasons post lists the other comments that tend to travel with this one.
The stamp has to match the state too
A professional engineer stamps in the states where they are licensed. A multi-state installer often needs more than one stamp, and the stamped sheet has to cite the code of the state where it is filed. Our post on multi-state solar PE stamps covers licensing. The state-by-state permitting differences post covers process.
Athol Energy prepares permit design sets and coordinates PE stamping across Massachusetts, Connecticut, New York, Rhode Island, and Pennsylvania. Each set is built from that state's template. A Westchester set does not inherit a Massachusetts note, and a New York City set uses New York City's own code path.
Questions about NEC editions for solar permits
Which NEC edition does Massachusetts use for solar?
Massachusetts enforces the 2026 NEC through 527 CMR 12.00, with state amendments, effective April 24, 2026.
Which NEC edition does New York use?
The New York State Uniform Code references the 2023 NEC. New York City enforces its own electrical code, so city permits use a different basis.
Which NEC edition does Connecticut use?
Connecticut's 2022 State Building Code, in effect since October 1, 2022, adopts the 2020 NEC with amendments. Confirm with the town before filing in case a newer edition has been adopted.
If your team runs one template across three states, that is the next rejection waiting. Contact Athol Energy and we will set up state-specific permit sets for your jobs.