CSLB Electrical (C-10): Study Guide and Online Practice Exam + Law and Business Study Guide and Online Practice Exam

What’s included

• Learn the material: Electrical (C-10) Study Guide Book
• Pass the test: Electrical (C-10) Practice Exam
• Required for all California contractor applicants: Law & Business Study Guide Book and Law & Business Practice Exam

What this covers

Per the state's classification, a C-10 contractor "installs, erects, constructs, repairs, services, alters, adds to, or designs... electrical wiring, services, equipment, and apparatus for light, heat, and power." This printed book covers the subjects the state tests. See the official CSLB C-10 classification.

Sample questions — Try our free practice test

1. At what depth should U.F. cable be buried in the earth, given it has no supplemental protection?
   A. 12" · B. 18" · ✓ C. 24" · D. 36"
2. The larger the conductor, the:
   A. Lower the ampacity · ✓ B. Lower the resistance · C. Higher the resistance · D. Higher the voltage
3. Type UF cable shall not be used in:
   A. Hoistways · B. Motion picture studios · C. Storage battery rooms · ✓ D. All of the above
4. A shunt is used in parallel with a d. c. ammeter measuring large currents to:
   A. dampen the meter pointer · ✓ B. reduce the meter current · C. protect the meter against shorts · D. increase the sensitivity of the meter
5. The minimum clearance from ground to service conductors over a public street is:
   A. 12' · B. 15' · ✓ C. 18' · D. 21'
6. When you check a 3 phase motor winding for polarity with a compass, the pointer should indicate:
   ✓ A. the same number of alternate north and south poles · B. the same number of alternate poles as there are phases · C. a north pointer deflection in the direction of rotation · D. a south pointer deflection in the direction of rotation
7. [Law & Business] A construction contract was written containing the following time estimates to complete the job. It would take 2 days to ready the construction site and then the job itself would be done in 2 phases. The first phase would take 10 days and the second would take 7 days, but these 2 phases could be at the same time. It would take one additional day at the end to clean up. How many days would it take to complete this project?
   A. 15 days · ✓ B. 13 days · C. 11 days · D. 7 days
8. [Law & Business] A contractor receives a notice from the Employment Development Department (EDD) that one of his former employees has filed a claim for Unemployment Insurance (UI) benefits against his reserve account. He/she may:
   A. call EDD within 5 days and protest · ✓ B. protest, in writing, within 10 days of the mailing date of the notice · C. protest, in writing, within 30 days of the mailing date · D. protest, in writing, within 45 days of the mailing date