California C10 Electrical License Practice Exam

The C-10 Electrical Contractor License allows professionals to place, install, erect, or connect electrical wires, fixtures, appliances, apparatus, raceways, conduits, solar photovoltaic cells, and related components that generate, transmit, transform, or utilize electrical energy. According to the California State License Board (CSLB), this specialty classification enables contractors to provide a wide range of electrical services for homes, businesses, and industrial facilities.

With a C10 license, electrical contractors can perform services including:

• A/C wiring installations
• Power panel changes and upgrades
• Adding electrical outlets
• Installing ceiling and attic fans
• Recessed or canned lighting installation
• Outdoor lighting systems
• New construction electrical wiring
• Pool and spa circuit installation
• Security lighting systems
• Cable networking and television installations
• Phone and cable installations
• Speaker and audio cable services
• Wiring for additions and remodels

Obtaining a C10 Electrical Contractor License in California requires meeting several requirements:

• Four years of journey-level experience or higher in the electrical field
• Passing the C10 trade exam with a score of 72% or higher
• Passing the California Business and Law exam with a score of 72% or higher
• Submitting fingerprints and passing a criminal background check
• Filing a contractor bond (typically $15,000)
• Providing proof of workers’ compensation insurance (if you have employees)
• Paying all required application and license fees

Yes, you must pass both the C10 trade exam and the California Business and Law exam to receive your license. We offer a comprehensive practice test for the Business and Law exam at California Law and Business Practice Test.

Preparation for the C10 exam involves studying various codes and literature, including:

• 2022 California Building Code
• 2022 California Electrical Code
• 2022 California Energy Code
• 2022 California Residential Code
• 2022 California Fire Code
• American Electricians’ Handbook
• Photovoltaic Systems
• State of California General Industry & Electrical Safety Orders
• Ugly’s Electrical References

For additional guidance, the California C10 Study Guide is a valuable resource

C10 Exam Content Breakdown

The PSI exam content is distributed across several key areas:

1. Planning and Estimating (20%)
2. Rough Wiring (27%)
3. Finish Wiring and Trim (19%)
4. Startup, Troubleshooting, and Maintenance (12%)
5. Safety (22%)

For detailed information on exam content, refer to the official

Here are examples of multiple-choice questions you might encounter on the actual exam:

Question 1: What is the minimum size equipment grounding conductor required for a 100-amp circuit using THWN conductors in conduit?
A) 8 AWG
B) 6 AWG
C) 4 AWG
D) 10 AWG
Answer: A) 8 AWG (Reference: 2022 California Electrical Code, Table 250.122)

Question 2: What is the maximum number of 12 AWG THHN conductors permitted in a 3/4-inch EMT conduit?
A) 12
B) 16
C) 18
D) 24
Answer: B) 16 (Reference: 2022 California Electrical Code, Table C.1)

Question 3: At what height should a wall switch typically be installed in a residential application?
A) 44 inches
B) 48 inches
C) 52 inches
D) 54 inches
Answer: B) 48 inches (Reference: Industry standard practice)

Our practice exam offers several advantages over static PDF study materials:

• Realistic Test Environment: Our exam replicates the format, timing, and pressure of the actual PSI exam, with 115 questions to be completed in 210 minutes.
• Comprehensive Question Bank: With over 1100 questions, our practice test covers the full range of topics found on the actual exam.
• Performance Tracking: Our system tracks your progress and identifies areas where you need additional study.
• Timed Practice: Unlike static PDFs, our timed exam helps you develop the pacing needed to complete the actual test efficiently.
• Updated Content: Our questions reflect the latest codes and standards used in the current CSLB exam.

1. What Are the Requirements for a C10 License?

To qualify for the C10 Electrical Contractor License, you must:

• Be 18+ years old.
• Have 4 years of journeyman-level experience.
• Pass the C10 trade exam and the Business & Law exam.

2. Do I Need to Pass the Business Law Exam?

Yes! The Business & Law exam is mandatory. Practice with our California Business Law Practice Test.

3. How Many Questions Are on the Real C10 Exam?

The PSI-administered C10 exam has 115 questions, with 210 minutes to complete it.

4. Why Use a Timed Practice Exam Instead of a PDF?

A timed practice exam mimics the real test environment, helping you manage time and pressure. Our 1,100+ question bank ensures comprehensive preparation.

5. How Much Do Electricians Make in California?

According to industry reports, C10-licensed electricians in California earn $60,000–$100,000+ annually, depending on experience and specialization.

Obtaining your California C10 Electrical Contractor License is a significant achievement that can substantially enhance your career prospects and earning potential. Our comprehensive practice exam, featuring over 1100 questions in the same format as the PSI exam, gives you the best possible preparation for success.

By familiarizing yourself with the exam format, content areas, and testing environment, you’ll approach test day with confidence and readiness. Don’t leave your licensing exam to chance—prepare thoroughly with our practice test designed by industry experts.

Ready to start your journey toward C10 certification? Begin practicing today and take the first step toward your new career as a licensed electrical contractor in California.