California CSLB C10 Electrical Exam Latest 2025 Actual Questions and Verified Answers (2025 / 2026) A+ Grade 100% Guarantee Verified by Experts

CALIFORNIA CSLB C10 ELECTRICAL
EXAM Questions with 100% Correct
Answers



1. Which of the following bulbs cannot be used with dimmer
switches?

a. Incandescent
b. LED
c. CFL
d. All can be used if the dimmer is UL-listed for the specific
load type

Answer: D
Rationale: Modern dimmers are designed for various bulb types
(LED, CFL, incandescent) if UL-listed for compatibility.




2. What is the most common location for trim in electrical
equipment?

a. Junction boxes
b. Panelboards
c. Conduit fittings
d. Service meters

Answer: B
Rationale: Trim (e.g., dead fronts) is typically installed in
panelboards for safety and aesthetics.




3. What is the most common location for terminal lugs?

, a. Main service disconnect
b. Batteries in PV systems
c. Lighting fixtures
d. Receptacles

Answer: B
Rationale: Terminal lugs secure conductors to battery posts in
photovoltaic (PV) systems.




4. What is the minimum number of receptacles required in a
garage?

a. 0
b. 1
c. 2
d. 3

Answer: B
Rationale: NEC 210.52(G) mandates at least one receptacle in
residential garages.




5. Mobile home service equipment must be within ___ of the
exterior wall.

a. 10'
b. 30'
c. 50'
d. 75'

Answer: B
Rationale: NEC 550.32 requires service equipment to be within 30'
and line-of-sight of the mobile home.




6. Minimum clearance for 300V–600V service conductors in
non-traffic areas?