CALIFORNIA CSLB C10 ELECTRICAL
EXAM Questions with 100% Correct Answers
- 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.
- 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.
- What is the most common location for terminal lugs? 1 / 2
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.
- 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.
- 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.
- Minimum clearance for 300V–600V service conductors in
- / 2
non-traffic areas?