Contractor Exam Practice
Electrical Exams
Don't leave your California electrical contractor license to chance. Pass your CSLB Law & Business and C-10 Trade exams with our specific question banks.
No signup required • No ads • Start immediately
Updated Content
Students Helped
Questions for Each Exam
Student Rating
How to Pass California C-10 Electrical Exams
It requires you to pass TWO separate exams: the Law & Business Examination and the Trade Examination. Mastering state-specific regulations, the National Electrical Code (NEC), and load calculations. Our comprehensive study system helps you prepare for both with specific, tailored practice questions.
Topics Covered
Who Takes This Exam?
Contractors & Certified Electricians
Anyone seeking an Electrical Contractor license or Electrician Certification in California must pass a state exam.
Pre-Licensing Requirements
You must be 18+, complete apprenticeship or experience requirements, and submit any required documentation before your California electrical certification or contractor license can be issued.
Master Your California Electrical Exams
Learn from expert insights and avoid the most common pitfalls that trip up test-takers in California.
Study Tips
Expert strategies for success
Study Business Law (CSLB)
If you are taking the C-10, allocate significant time to study California mechanics liens, labor laws, and contractor business practices.
Learn to Navigate the NEC
For the closed-book CSLB exams, speed and recall are key. Learn core concepts and common formulas, as you cannot bring an NEC index to help you.
Practice Calculations
A significant portion of the exams involves math. Master Ohm’s Law, voltage drop, box fill, and load calculations.
Review Cal/OSHA Safety
Don’t ignore the safety section. Know the rules for PPE, ladders, scaffolding, and confined spaces found in the Cal/OSHA Safety Orders.
Common Mistakes
Pitfalls to avoid on test day
Grounding vs. Bonding
Many candidates confuse grounding (connecting to earth) with bonding (connecting paths for fault current), which are distinct concepts in the NEC.
Box Fill Calculations
Incorrectly calculating box fill volume by missing deductions for clamps, devices, or equipment grounding conductors.
Voltage Drop Formulas
Using the wrong formula or resistance values (K-factor) when calculating voltage drop for long runs.
Motor Circuit Sizing
Mixing up the rules for sizing motor branch-circuit conductors (125%) vs. overload protection vs. short-circuit protection.
Free California Electrical Exam Practice PDF
Download our comprehensive practice test with 50 California-specific electrical exam questions with answers. Perfect for offline study and test preparation!
Instant download • No email required • Updated for 2026
Ready to pass your California electrical contractor licensing exam?
Join thousands of students who have successfully passed their electrical contractor licensing exam on the first try
Start Your Preparation for Free
Get a head start with our curated practice questions. We've divided these into the two main sections you'll need to master for your California license.
Law and Business Exam
Practice for the CSLB Law & Business requirements
C-10 Electrical Trade Exam
Specific topics for the California C-10 License
Premium Practice Tools
Unlock our most powerful resources to guarantee your success
Flashcards
500+ Flashcards
Full Question Bank
1500+ exam-like questions
Hard Questions
Tricky questions people miss
Key Concepts Guide
Master all electrical concepts
3 Full-Length Practice Tests Included
Get instant access to our printable 950+ question practice exam book. Includes 3 complete electrical contractor practice tests — each with a 115-question Law & Business section and a 115-question C-10 Trade section — plus detailed answer keys with explanations. Perfect for timed practice sessions that mirror the real exam.
Built for One Goal: Pass the Electrical Exam on Your First Try
Practice what the exam actually tests — NEC code, load calculations, grounding, and CA contractor law.
Official California CSLB Resources
Access official California State License Board (CSLB) websites for licensing information, exam scheduling, and study materials.
These are official California State License Board (CSLB) resources. Electrical Contractor Exam Practice is not affiliated with the CSLB.
Your Questions Answered
Quick answers to the most common questions about the California electrical contractor licensing exam
How do I pass my California C-10 electrical exam?
To pass, you need to master electrical calculations and theory under time pressure. Because the CSLB C-10 Contractor exam is closed-book, the key is memorizing formulas and understanding how to apply the code. Focus on Article 220 (Calculations), Article 230 (Services), Article 250 (Grounding), and Article 430 (Motors).
Are the California contractor exams open book?
No. Both the CSLB Law & Business exam and the C-10 Trade exam are strictly closed-book. You cannot bring any reference materials, code books, or notes into the PSI testing center.
How long is my application good for?
All applications are given 18 months from the day they are accepted to pass the examination(s). If you do not pass within 18 months, your application is considered void, and you will have to submit a new application with new fees.
How soon will I know if I passed or failed?
At the end of your examination, you’ll be given a printed report showing whether you passed or failed. The failing score report will indicate your overall score and a breakdown by section. The passing score report does not show the overall score.
What happens if I fail my electrical exam?
If you fail, you can reschedule the exam. You must wait at least 21 calendar days between attempts, and you will have to pay a $100 rescheduling fee to the CSLB. You only have to retake the specific exam you failed.