CALIFORNIA C10 CSLB
ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS
LATEST UPDATE 2026/2027 .
, 1. Min #receptacles in a garage ✔✔ CORRECT ANSWER 1
2. Mobile home service equipment shall be line of sight and no more than
from the exterior wall of the home ✔✔ CORRECT ANSWER 30'
3. If a service conductor is over 300V but less than 600V, what is the minimum clearance of that service conductor
if it runs in residential and commercial areas that are not subject to traffic? ✔✔ CORRECT ANSWER 15'
4. A power meter must be a minimum of feet away from any door, gas meter, or
window opening. ✔✔ CORRECT ANSWER 3
5. A rod-type grounding electrode should have a minimum diameter of ✔✔ CORRECT ANSWER 5/8"
6. Conductors entering buildings shall be protected ✔✔ CORRECT ANSWER To the point of entrance
7. A grounding electrode must be in contact with soil a minimum ✔✔ CORRECT ANSWER 8'
8. If a raceway has various conductors coming from different systems, then you should group each system
separately every ✔✔ CORRECT ANSWER 6'
9. What is the maximum distance a service conductor can run over a roof? ✔✔ CORRECT ANSWER 6'
10. Soldered connections are not permitted for ✔✔ CORRECT ANSWER Grounded connections
11. Refer to diagram. If you have 0 to 150 nominal voltage to ground, then what is the minimum clear distance
required from such equipment? ✔✔ CORRECT ANSWER 3'
12. What color marking is required for conductors or busbars that carry the higher voltage to ground and these
marking are required at connection points that have a grounded conductor present? ✔✔ CORRECT ANSWER
Orange
13. What is the purpose of a BOS? ✔✔ CORRECT ANSWER Integrates PV into the building's load
14. Cable trays or similar raceways carrying service entrance conductors must ✔✔ CORRECT ANSWER-
✔✔ CORRECT ANSWER Be Labled
15. Which of the following bulbs cannot be used with dimmer switches? ✔✔ CORRECT ANSWER All of the listed bulb
types can be used with dimmers provided the dimmer is designed, tested and UL listed for the specific lighting source or load type.
16. What is the most common location for trim in electrical equipment? ✔✔ CORRECT ANSWER Panel-
boards
17. What is the most common location for terminal lugs? ✔✔ CORRECT ANSWER Batteries in PV system
ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS
LATEST UPDATE 2026/2027 .
, 1. Min #receptacles in a garage ✔✔ CORRECT ANSWER 1
2. Mobile home service equipment shall be line of sight and no more than
from the exterior wall of the home ✔✔ CORRECT ANSWER 30'
3. If a service conductor is over 300V but less than 600V, what is the minimum clearance of that service conductor
if it runs in residential and commercial areas that are not subject to traffic? ✔✔ CORRECT ANSWER 15'
4. A power meter must be a minimum of feet away from any door, gas meter, or
window opening. ✔✔ CORRECT ANSWER 3
5. A rod-type grounding electrode should have a minimum diameter of ✔✔ CORRECT ANSWER 5/8"
6. Conductors entering buildings shall be protected ✔✔ CORRECT ANSWER To the point of entrance
7. A grounding electrode must be in contact with soil a minimum ✔✔ CORRECT ANSWER 8'
8. If a raceway has various conductors coming from different systems, then you should group each system
separately every ✔✔ CORRECT ANSWER 6'
9. What is the maximum distance a service conductor can run over a roof? ✔✔ CORRECT ANSWER 6'
10. Soldered connections are not permitted for ✔✔ CORRECT ANSWER Grounded connections
11. Refer to diagram. If you have 0 to 150 nominal voltage to ground, then what is the minimum clear distance
required from such equipment? ✔✔ CORRECT ANSWER 3'
12. What color marking is required for conductors or busbars that carry the higher voltage to ground and these
marking are required at connection points that have a grounded conductor present? ✔✔ CORRECT ANSWER
Orange
13. What is the purpose of a BOS? ✔✔ CORRECT ANSWER Integrates PV into the building's load
14. Cable trays or similar raceways carrying service entrance conductors must ✔✔ CORRECT ANSWER-
✔✔ CORRECT ANSWER Be Labled
15. Which of the following bulbs cannot be used with dimmer switches? ✔✔ CORRECT ANSWER All of the listed bulb
types can be used with dimmers provided the dimmer is designed, tested and UL listed for the specific lighting source or load type.
16. What is the most common location for trim in electrical equipment? ✔✔ CORRECT ANSWER Panel-
boards
17. What is the most common location for terminal lugs? ✔✔ CORRECT ANSWER Batteries in PV system
