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CSLB exam preparation
C-10 Electrical Contractor Exam Prep
Practice electrical estimating, rough and finish wiring, troubleshooting, maintenance, and safety.
About this exam
CXP's C-10 practice bank contains 200 questions. Start with a free diagnostic to review a sample of your knowledge across electrical work and safety.
The C-10 guide applies to exams scheduled on or after June 1, 2024, and lists approximate section percentages. CSLB's Examination FAQ is the source for official exam details; CXP's Spanish-language practice is not a claim that CSLB offers the C-10 classification exam in Spanish. The 115-question mock is not an official exam length.
- Practice bank size: 200 questions
- Mock exam size: 115 questions
Official CSLB study-guide topics
- Planning and Estimating — Approximate exam percentage: 28%
- Rough Wiring — Approximate exam percentage: 27%
- Finish Wiring and Trim — Approximate exam percentage: 11%
- Startup, Troubleshooting, and Maintenance — Approximate exam percentage: 16%
- Safety — Approximate exam percentage: 18%
Exam topics and approximate weights: CSLB study guide.
Sample question
What is the calculated continuous load feeder demand for a commercial branch circuit with a non-continuous load of 80 Amperes and a continuous load of 100 Amperes?
- 205 Amperes
- 225 Amperes
- 180 Amperes
- 200 Amperes
Show answer and explanation
Correct answer: 205 Amperes
Explanation: Under the 2022 California Electrical Code (CEC), CCR Title 24, Part 3, §215.2(A)(1), adopting NEC §215.2(A)(1), continuous feeder loads are calculated at 125%: 100 A × 125% = 100 A × 1.25 = 125 A, and 80 A + 125 A = 205 A. Therefore, 205 Amperes is correct. 180 Amperes simply adds 80 A + 100 A without adjustment, 200 Amperes uses an unsupported 120% factor, and 225 Amperes applies an excessive factor. The governing rule is the CEC/NEC feeder-ampacity requirement, not CBC, OSHA, or contractor-licensing provisions.
The CXP prep module
Trade exam preparation for C-10 electrical work.
- A practice question bank and timed mock exam for this module.
- A Readiness Score to track progress by topic.
- Questions and explanations available in English and Spanish.
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Use the free diagnostic to find your starting point before choosing what to study.