Checked against primary sources 2026-09-05

Open book, closed bag

California Electrician Exam Book Rules: None Brought In

The California certification exam is open book, but the books belong to the testing system. You may not bring or use your own reference materials, which means every tabbing and highlighting question people ask about other states' exams is beside the point here. Here's what to do instead.

Test yourself: thirty free questions, timed

The rule, in one line

The Candidate Information Bulletin says you may not bring or use your own reference materials. The books are provided to every candidate inside the testing system.

That's it. There's no exception for a clean book, no exception for a book with printed tabs, no exception for a Cal/OSHA pocket guide you already own.

What's on the screen

Three references come with every certification exam.

• NFPA 70, National Electrical Code, 2023 Edition
• NFPA 70E, Standard for Electrical Safety in the Workplace, 2024 Edition
• Cal/OSHA Pocket Guide for the Construction Industry, updated 2022

Three of the five exams add something. Fire/Life Safety adds NFPA 72, National Fire Alarm Code, 2025 Edition and NFPA 170, Standard for Fire Safety Symbols, 2018 Edition. Voice Data Video adds the BICSI Information Technology Systems Installation Methods Manual, 6th Edition. Nonresidential Lighting adds the Lighten Up! and Illuminations training textbooks, 4th Edition.

Why there are no marking rules to learn

In states where you carry your own book, half the anxiety before an exam is about marking: how many tabs, whether highlighting counts as writing, whether a printed index page is permitted.

None of that applies here, and the bulletin prints no marking rules at all. That isn't an oversight. There's nothing to rule on when nobody's book comes through the door.

So if you find advice about tabbing for the California exam, check the date on it. The rule you're reading may belong to another state, or to a version of this exam that predates the current bulletin.

What to practice instead of tabbing

The skill this format actually tests is finding a rule in a copy you've never handled, under a clock. That's a different muscle from flipping to a tab you cut yourself.

Learn the shape of the book. Chapters 1 through 4 apply generally, 5 through 7 cover special occupancies, equipment and conditions, and Chapter 9 is the tables. If you know which chapter a subject lives in, you're most of the way to the section.

Learn the article numbers cold. Grounding and bonding is Article 250, ampacity is Article 310, overcurrent is Article 240, boxes are Article 314, motors are Article 430. Those four hold a large share of any electrician exam.

Practice the table lookups by number. Table 310.16 for ampacity, 314.16 for box fill, and Chapter 9 Tables 1, 4, 5 and 8 for raceway fill and conductor properties. Our calculators print the working beside each of those.

You still want your own book at home

Not bringing a book to the exam is not a reason to study without one. The exam is written against the 2023 National Electrical Code, and you learn to navigate a code book by navigating one.

If you're buying, know what you're buying. NFPA publishes the National Electrical Code. The California Electrical Code is Title 24 Part 3, which is the model code plus California's changes, and the 2025 edition of it is built on the same 2023 NEC. Which code edition applies sorts the two out.

For the exam itself, the model code is the reference on screen, so study from the NEC rather than from a state amendment list.

The contractor exam is the other extreme

If you're also chasing a C-10, don't carry a habit across. The CSLB exams are closed book. Reading materials and textbooks are prohibited items, and so are phones, calculators, notes and food.

One exam hands you three references and one hands you none. The C-10 exam page covers the rest of the differences.

Questions people ask

Can I bring my own NEC to the California electrician exam?

No. The Candidate Information Bulletin says you may not bring or use your own reference materials, because the books are supplied inside the testing system.

Can I tab or highlight the code book for the California exam?

There's nothing to tab. Since you can't bring a book, the bulletin prints no marking rules at all. Any tabbing advice you find for this exam is worth checking against the current bulletin.

Which NEC edition is on the screen?

The 2023 edition. NFPA 70E 2024 and the Cal/OSHA Pocket Guide for the Construction Industry updated 2022 come with it, and three of the five exams add a further reference.

Is the California electrician exam open book?

Yes, in the sense that you can look rules up during the exam. The books just belong to the testing system rather than to you.

Should I still buy a code book to study from?

Yes. You learn to find a rule quickly by doing it repeatedly, and the exam is written against the 2023 National Electrical Code. Study from the model code rather than from a state amendment list.

Is the C-10 contractor exam open book too?

No, the opposite. CSLB's exams are closed book, and reading materials, textbooks, phones, calculators, notes and food are all prohibited items.

What this page cites

• Candidate Information Bulletin, Electrician Certification Unit States that candidates may not bring or use their own reference materials and lists the books supplied for each exam. source
• DIR ECU test information The DIR page for the certification exam, naming CPS HR Consulting through Pearson VUE and the one year eligibility window. source
• CSLB examination FAQ States that the contractor exams are closed book and lists reading materials and textbooks among the prohibited items. source
• California Building Standards Commission codes page Publishes Title 24, whose Part 3 is the California Electrical Code, effective January 1, 2026 for the 2025 edition. source