CALFORNIA C10 ELECTRICAL EXAM
2025 QUESTIONS AND ANSWERS
Min #receptacles in a garage - ANS 1
Mobile home service equipment shall be line of sight and no more than ____ from the exterior
wall of the home - ANS 30'
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? -
ANS 15'
A power meter must be a minimum of ____ feet away from any door, gas meter, or window
opening. - ANS 3
A rod-type grounding electrode should have a minimum diameter of - ANS 5/8"
Conductors entering buildings shall be protected: - ANS To the point of entrance
A grounding electrode must be in contact with soil a minimum: - ANS 8'
1
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, If a raceway has various conductors coming from different systems, then you should group each
system separately every: - ANS 6'
What is the maximum distance a service conductor can run over a roof? - ANS 6'
Soldered connections are not permitted for - ANS Grounded connections
Refer to diagram. If you have 0 to 150 nominal voltage to ground, then what is the minimum
clear distance required from such equipment? - ANS 3'
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? - ANS Orange
What is the purpose of a BOS? - ANS Integrates PV into the building's load
Cable trays or similar raceways carrying service entrance conductors must: - ANS Be Labled
Which of the following bulbs cannot be used with dimmer switches? - ANS 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.
What is the most common location for trim in electrical equipment? - ANS Panelboards
What is the most common location for terminal lugs? - ANS Batteries in PV system
2
What is the minimum length of a concrete-encased grounding electrode? - ANS 20'
Page
@COPYRIGHT SIRJOEL 2025/2026
2025 QUESTIONS AND ANSWERS
Min #receptacles in a garage - ANS 1
Mobile home service equipment shall be line of sight and no more than ____ from the exterior
wall of the home - ANS 30'
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? -
ANS 15'
A power meter must be a minimum of ____ feet away from any door, gas meter, or window
opening. - ANS 3
A rod-type grounding electrode should have a minimum diameter of - ANS 5/8"
Conductors entering buildings shall be protected: - ANS To the point of entrance
A grounding electrode must be in contact with soil a minimum: - ANS 8'
1
Page
@COPYRIGHT SIRJOEL 2025/2026
, If a raceway has various conductors coming from different systems, then you should group each
system separately every: - ANS 6'
What is the maximum distance a service conductor can run over a roof? - ANS 6'
Soldered connections are not permitted for - ANS Grounded connections
Refer to diagram. If you have 0 to 150 nominal voltage to ground, then what is the minimum
clear distance required from such equipment? - ANS 3'
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? - ANS Orange
What is the purpose of a BOS? - ANS Integrates PV into the building's load
Cable trays or similar raceways carrying service entrance conductors must: - ANS Be Labled
Which of the following bulbs cannot be used with dimmer switches? - ANS 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.
What is the most common location for trim in electrical equipment? - ANS Panelboards
What is the most common location for terminal lugs? - ANS Batteries in PV system
2
What is the minimum length of a concrete-encased grounding electrode? - ANS 20'
Page
@COPYRIGHT SIRJOEL 2025/2026
