C-10 Electrical Part 1
Electrical License
California 2026/2027 —
Exam Questions, Code
Calculations And solution
1. Q: What is the minimum working space in front of equipment
operating at 151–600 volts with exposed live parts on one side and no
live parts on the other?
A: 3½ ft (NEC 110.26(A)(1)).
2. Q: The working space required for electrical equipment must be kept
clear for a distance of at least _____ from the equipment.
A: 30 in. (width) or the equipment width, whichever is greater (NEC
110.26(A)(2)).
3. Q: What is the minimum headroom for electrical equipment working
space?
A: 6½ ft (NEC 110.26(A)(3)).
4. Q: Illumination for working space is required for equipment operating
at how many volts or more?
A: 600 V, nominal (NEC 110.26(D)).
5. Q: Entrance to working space must be at least _____ wide and _____
high.
A: 24 in. wide, 6½ ft high (NEC 110.26(C)(2)).
6. Q: When equipment rated 1200 A or more contains overcurrent
devices, there must be a dedicated entrance to the working space.
, What minimum width is required for that entrance?
A: 24 in. (NEC 110.26(C)(2)(a)).
7. Q: The term “voltage to ground” in a grounded electrical system
means:
A: The voltage between the conductor and the point of grounding
(NEC 100).
8. Q: In dwelling units, what is the minimum clearance for service
conductors over a roof with a slope of 4 in. per 12 in. or greater?
A: 3 ft (NEC 230.24(A) Exception 3).
9. Q: Service conductors under 600 V installed above a sidewalk must
have a minimum clearance of:
A: 10 ft (NEC 230.24(B)).
10. Q: The maximum number of disconnects permitted to disconnect all
service conductors in a building is:
A: Six (NEC 230.71(A)).
11. Q: Service disconnects must be marked to indicate the load being
served and must be located:
A: At a readily accessible location nearest the point of entrance (NEC
230.70).
12. Q: Ungrounded conductors of a service must have a minimum size of
what AWG copper?
A: 8 AWG (NEC 230.31(B)).
13. Q: Overhead service conductors must have a minimum vertical
clearance from final grade above a residential driveway:
A: 12 ft (NEC 230.24(B)).
14. Q: What is the minimum clearance from a window that opens for
service conductors?
A: 3 ft (NEC 230.9).
, 15. Q: A panelboard containing snap switches rated 30 A or less must
have at least how many working clearance in front?
A: 36 in. (if voltage to ground ≤ 150 V) (NEC 110.26).
16. Q: The shortest distance a panelboard can be located from the floor
is:
A: There is no minimum, but the highest breaker switch handle must
be no more than 6 ft 7 in. above the floor (NEC 240.24(A)).
17. Q: In a multi-dwelling building, each occupant must have access to
the overcurrent device protecting their unit, unless:
A: The panelboard is located in a locked utility area and each
occupant has a dedicated branch circuit (NEC 240.24(B) Exception).
18. Q: A 120/240 V single-phase service drop must maintain a clearance
of at least _____ over a swimming pool.
A: 22½ ft (NEC 680.8).
19. Q: What is the minimum burial depth for direct-buried 120/240 V
residential feeder cable (UF) under a driveway?
A: 24 in. (NEC 300.5).
20. Q: Underground service conductors supplying a dwelling must have
their location identified by a warning ribbon placed at least _____
above the conductors.
A: 12 in. (NEC 300.5(D)(3)).
21–40: Grounding, Bonding, and Electrodes
21. Q: A ground rod must be driven to a depth of at least:
A: 8 ft (NEC 250.52(A)(5)).
Electrical License
California 2026/2027 —
Exam Questions, Code
Calculations And solution
1. Q: What is the minimum working space in front of equipment
operating at 151–600 volts with exposed live parts on one side and no
live parts on the other?
A: 3½ ft (NEC 110.26(A)(1)).
2. Q: The working space required for electrical equipment must be kept
clear for a distance of at least _____ from the equipment.
A: 30 in. (width) or the equipment width, whichever is greater (NEC
110.26(A)(2)).
3. Q: What is the minimum headroom for electrical equipment working
space?
A: 6½ ft (NEC 110.26(A)(3)).
4. Q: Illumination for working space is required for equipment operating
at how many volts or more?
A: 600 V, nominal (NEC 110.26(D)).
5. Q: Entrance to working space must be at least _____ wide and _____
high.
A: 24 in. wide, 6½ ft high (NEC 110.26(C)(2)).
6. Q: When equipment rated 1200 A or more contains overcurrent
devices, there must be a dedicated entrance to the working space.
, What minimum width is required for that entrance?
A: 24 in. (NEC 110.26(C)(2)(a)).
7. Q: The term “voltage to ground” in a grounded electrical system
means:
A: The voltage between the conductor and the point of grounding
(NEC 100).
8. Q: In dwelling units, what is the minimum clearance for service
conductors over a roof with a slope of 4 in. per 12 in. or greater?
A: 3 ft (NEC 230.24(A) Exception 3).
9. Q: Service conductors under 600 V installed above a sidewalk must
have a minimum clearance of:
A: 10 ft (NEC 230.24(B)).
10. Q: The maximum number of disconnects permitted to disconnect all
service conductors in a building is:
A: Six (NEC 230.71(A)).
11. Q: Service disconnects must be marked to indicate the load being
served and must be located:
A: At a readily accessible location nearest the point of entrance (NEC
230.70).
12. Q: Ungrounded conductors of a service must have a minimum size of
what AWG copper?
A: 8 AWG (NEC 230.31(B)).
13. Q: Overhead service conductors must have a minimum vertical
clearance from final grade above a residential driveway:
A: 12 ft (NEC 230.24(B)).
14. Q: What is the minimum clearance from a window that opens for
service conductors?
A: 3 ft (NEC 230.9).
, 15. Q: A panelboard containing snap switches rated 30 A or less must
have at least how many working clearance in front?
A: 36 in. (if voltage to ground ≤ 150 V) (NEC 110.26).
16. Q: The shortest distance a panelboard can be located from the floor
is:
A: There is no minimum, but the highest breaker switch handle must
be no more than 6 ft 7 in. above the floor (NEC 240.24(A)).
17. Q: In a multi-dwelling building, each occupant must have access to
the overcurrent device protecting their unit, unless:
A: The panelboard is located in a locked utility area and each
occupant has a dedicated branch circuit (NEC 240.24(B) Exception).
18. Q: A 120/240 V single-phase service drop must maintain a clearance
of at least _____ over a swimming pool.
A: 22½ ft (NEC 680.8).
19. Q: What is the minimum burial depth for direct-buried 120/240 V
residential feeder cable (UF) under a driveway?
A: 24 in. (NEC 300.5).
20. Q: Underground service conductors supplying a dwelling must have
their location identified by a warning ribbon placed at least _____
above the conductors.
A: 12 in. (NEC 300.5(D)(3)).
21–40: Grounding, Bonding, and Electrodes
21. Q: A ground rod must be driven to a depth of at least:
A: 8 ft (NEC 250.52(A)(5)).
