2020 vs 2023 vs 2026 NEC: Which Edition Is on Your Exam?

One of the most expensive mistakes you can make is studying the wrong edition of the NEC. Show up prepared for the 2023 code when your state's exam is on the 2020 — or vice versa — and you'll meet questions and table numbers you never practiced.

The NEC runs on a 3-year cycle

The National Electrical Code (NFPA 70) is revised every three years. The recent editions are:

• 2017, 2020, 2023, and 2026.

(There is no "2016" edition — if you've seen that, it's a mix-up.) The 2026 NEC is published, but publication isn't the same as adoption.

Publication ≠ what your state uses

The NEC isn't law until your state or local jurisdiction adopts it, and adoption lags. As of 2026, many states are still on the 2020 or 2023 edition, a few have moved to 2026, and a handful run older. Your exam is written to whatever edition your licensing board has adopted.

How to find your edition (do this first)

1. Check your state's electrical licensing board website — it lists the adopted code cycle.
2. Confirm with your exam provider (often PSI) — the candidate bulletin states the NEC edition the test is based on.
3. Buy or tab the matching code book. Studying with the wrong edition is the most avoidable way to lose points.

The good news

Most of what the journeyman exam tests is stable across editions. Conductor ampacity (Table 310.16), equipment grounding (250.122), box and conduit fill, the small-conductor rule (240.4(D)), and motor calculations are essentially the same whether you're on 2020, 2023, or 2026. So the fundamentals you drill carry over — you just want your references and a few code-specific changes to match your exam.

That's why Pass Your Electrician Exam lets you pick your code year when you sign up: you drill the universal fundamentals, with the references aligned to the edition that's actually on your test. Find your edition, tab the right book, and you've removed the single dumbest way to fail.