California CSLB C10 Electrical Updated Actual
Question and Answer (2026/2027) | A+ Verified
• Mobile home service equipment shall be line of sight and no more than ____ from the
exterior wall of the home -✓✓ 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? -✓✓ 15'
• A power meter must be a minimum of ____ feet away from any door, gas meter, or
window opening. -✓✓ 3
• A rod-type grounding electrode should have a minimum diameter of -✓✓ 5/8"
• Conductors entering buildings shall be protected: -✓✓ To the point of entrance
• A grounding electrode must be in contact with soil a minimum: -✓✓ 8'
• If a raceway has various conductors coming from different systems, then you should
group each system separately every: -✓✓ 6'
• What is the maximum distance a service conductor can run over a roof? -✓✓ 6'
• Soldered connections are not permitted for -✓✓ 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? -✓✓ 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? -✓✓ Orange
• What is the purpose of a BOS? -✓✓ Integrates PV into the building's load
• Cable trays or similar raceways carrying service entrance conductors must: -✓✓ Be
Labled
• Which of the following bulbs cannot be used with dimmer switches? -✓✓ 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? -✓✓ Panelboards
Question and Answer (2026/2027) | A+ Verified
• Mobile home service equipment shall be line of sight and no more than ____ from the
exterior wall of the home -✓✓ 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? -✓✓ 15'
• A power meter must be a minimum of ____ feet away from any door, gas meter, or
window opening. -✓✓ 3
• A rod-type grounding electrode should have a minimum diameter of -✓✓ 5/8"
• Conductors entering buildings shall be protected: -✓✓ To the point of entrance
• A grounding electrode must be in contact with soil a minimum: -✓✓ 8'
• If a raceway has various conductors coming from different systems, then you should
group each system separately every: -✓✓ 6'
• What is the maximum distance a service conductor can run over a roof? -✓✓ 6'
• Soldered connections are not permitted for -✓✓ 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? -✓✓ 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? -✓✓ Orange
• What is the purpose of a BOS? -✓✓ Integrates PV into the building's load
• Cable trays or similar raceways carrying service entrance conductors must: -✓✓ Be
Labled
• Which of the following bulbs cannot be used with dimmer switches? -✓✓ 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? -✓✓ Panelboards
