California Electrician PrepCertification, exam and code, in one place

Checked against primary sources 2026-09-05

Title 24, Part 3

California Electrical Code: Which NEC Edition Applies

California's electrical code is Part 3 of Title 24, and the 2025 edition took effect on January 1, 2026. It's built on the 2023 National Electrical Code, which is the same model year the certification exam supplies. Here's the paperwork behind that sentence.

Test yourself: thirty free questions, timed

On this page
  1. The short answer
  2. Two documents, one of which people buy by mistake
  3. The errata
  4. The editions before this one
  5. What your local jurisdiction enforces
  6. Which document wins where they conflict
  7. What this means for you
  8. Questions people ask
  9. What this page cites

The short answer

The 2025 California Building Standards Code, California Code of Regulations Title 24, was published on July 1, 2025 with an effective date of January 1, 2026. Part 3 of it is the California Electrical Code.

That edition is built on the 2023 National Electrical Code. The Building Standards Commission's Initial Statement of Reasons for the Part 3 rulemaking, BSC 01-23, says the Commission proposed to adopt the most recent edition of the model code, the 2023 NEC published by the National Fire Protection Association. The document is dated February 1, 2023 and belongs to the 2024 Triennial Code Cycle that produced the 2025 code.

Two documents, one of which people buy by mistake

The National Electrical Code is NFPA's model document. The California Electrical Code is Title 24 Part 3, which takes that model and applies California's changes to it.

Both are useful and they're not interchangeable. In the field the enforceable document is the California Electrical Code. On the certification exam the book supplied on screen is NFPA 70 itself, so a candidate studies the model code while a working electrician reads the state one. Which edition is on the exam covers that side.

The errata

The Building Standards Commission issued an errata for the 2025 Title 24 Part 3, California Electrical Code, with an effective date of January 1, 2026. It corrects non substantive printing errors and omissions.

If you're working from a printed copy, it's worth downloading. Non substantive doesn't mean invisible, and a printing omission in a table is exactly the kind of thing you'd never notice until it mattered.

The editions before this one

California runs a three year cycle, and each edition is built on the NEC published two years before it takes effect.

The pattern is steady enough to plan around: a new edition every three years, always taking effect on the first of January.

What your local jurisdiction enforces

Title 24 sets the floor and local authorities adopt it, sometimes with their own changes on top.

Los Angeles County. Title 27 of the Los Angeles County Code, the Electrical Code, adopts the 2025 California Electrical Code by reference with effect from January 1, 2026, taking in Article 90, Chapters 1 through 9 and the annexes, subject to the county's own changes.

San Francisco. The Electrical Inspection Division page states that San Francisco enforces the 2025 California Electrical Code.

City of Los Angeles. Harder to pin down. Los Angeles Municipal Code section 93.0101 names the local document the Los Angeles Electrical Code, and section 93.0700 adopts the NEC, the California Electrical Code and the California Building Standards Code by reference without printing an edition year in the text we read. That section carries an amendment date of January 23, 2023 under Ordinance No. 187,719, and a code library page for the same article was read as referencing the 2022 California Electrical Code. We could not confirm which edition the city currently enforces, so ask the Department of Building and Safety rather than assuming.

Which document wins where they conflict

In the City of Los Angeles, section 93.0700 provides that where the NEC, the California Electrical Code and the Los Angeles Municipal Code conflict, LAMC section 93.0105 prevails.

That ordering is the thing to carry into any jurisdiction with its own amendments: local first, then state, then model. Section 93.0402 adds a city rule of its own, requiring electrical equipment as defined in the California Electrical Code Article 100 to be approved by the Department or listed by a Department approved testing agency, and installed and maintained to that listing.

What this means for you

If you're sitting the certification exam, study the 2023 NEC. That's the book on screen, and it's the same model year the state code is built on.

If you're pulling permits or being inspected, the California Electrical Code is what you're held to, plus whatever your city or county adds. Confirm the edition with the authority that inspects your work, especially in the City of Los Angeles.

If you're buying a book this year, the 2025 California Electrical Code is the current one and it won't be replaced until the next cycle. The next edition page covers what's coming.

Questions people ask

Which NEC edition does California use?

The 2025 California Electrical Code is built on the 2023 National Electrical Code and took effect January 1, 2026. It's Part 3 of Title 24 of the California Code of Regulations.

When did the 2025 California Electrical Code take effect?

January 1, 2026. The 2025 California Building Standards Code was published on July 1, 2025 with that effective date.

Is the California Electrical Code the same as the NEC?

No. The California Electrical Code is Title 24 Part 3, which takes the model National Electrical Code and applies California's changes. In the field the state document is the enforceable one.

Does my city use a different edition?

It can. Los Angeles County adopted the 2025 California Electrical Code by reference effective January 1, 2026, and San Francisco enforces the 2025 edition. We could not confirm the current edition for the City of Los Angeles, so ask the Department of Building and Safety.

Is there an errata for the 2025 California Electrical Code?

Yes. The Building Standards Commission issued one for Title 24 Part 3 with an effective date of January 1, 2026, correcting non substantive printing errors and omissions.

Which edition was in force before this one?

The 2022 California Electrical Code, built on the 2020 NEC, which took effect January 1, 2023. California has run a three year cycle for at least five editions.

Put it to the test

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What this page cites

If your book is the other edition

The 2023 to 2026 section crosswalk maps every section that moved, both directions, $29 once.

Built and maintained by Jeff Clerisier, Trojan Digital Marketing.

Every rule here is cited to the section it comes from, and corrections are logged in public with the date. This is study material rather than electrical advice, and it does not replace your own code book or your inspector.

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