• California CSLB
C10 Electrical 09/11/2026
Exam
California CSLB C10 Electrical Exam 1 review
test bank with over 400 questions and correct
detailed answers
All 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed in bathrooms of dwelling units always
require _____.
A
twist-lock receptacles
B
ground-fault circuit-interrupter protection
C
non-grounded receptacles
P 1
, • California CSLB
C10 Electrical 09/11/2026
Exam
D
waterproof receptacle covers –
Correct Answer :The Correct Answer Is B
Many people have been electrocuted in bathrooms due to an electric appliance (radio, electric razor, etc.) falling
into the sink or bathtub where a person is in contact with the water. A GFCI prevents many such accidents.
The NEC allows wall-switch controlled receptacles in dwelling units in lieu of lighting outlets in all habitable rooms
except _____.
A
basement and attic
B
living and family rooms
C
bedrooms
D
kitchen and bath –
Correct Answer :The Correct Answer Is D
The NEC allows a switched receptacle in all rooms, in lieu of ceiling or wall-mounted lighting fixtures, except the
kitchen and bathroom.
Insulated conductors of No. 6 or smaller, intended for use as grounded conductors in a circuit must be either of
the following colors?
A
Blue or black
B
P 2
, • California CSLB
C10 Electrical 09/11/2026
Exam
Red or black
C
White, gray, or have three continuous white stripes on other than green insulation.
D
Orange or yellow –
Correct Answer :The Correct Answer Is C
Insulated conductors, No. 6 AWG and smaller, intended for use as grounded (neutral) conductors or circuits,
shall be identified by a continuous outer finish of a white or gray, or by three continuous white stripes along its
entire length on other than green insulation. Conductors larger than No. 6 AWG may use white markers at points
of termination.
Direct buried conductors and cables emerging from the ground shall be protected by an enclosure or raceway a
distance above ground of _____.
A
6 feet
B
8 feet
C
10 feet
D
12 feet - Correct Answer :The Correct Answer Is B
Conductors emerging from the ground are subject to damage from lawn mowers, weed eaters, and the like.
Therefore, they must be protected by some means. Metal conduit, such as EMT or rigid steel conduit are two
approved means of protection.
Cable tray systems must not be used _____.
P 3
, • California CSLB
C10 Electrical 09/11/2026
Exam
A
for power and control applications
B
for service-entrance systems
C
for signal cables
D
in hoistways - Correct Answer :The Correct Answer Is D
Wiring installations installed in hoistways are subject to physical damage. Cable trays, using open conductors, are
not permitted in such locations.
EMT shall be supported at least every _____.
A
4 feet
B
8 feet
C
10 feet
D
15 feet - Correct Answer :The Correct Answer Is C
EMT must be supported every 10 feet to prevent sag or collapse.
What is the maximum dimensions of a lighting fixture that may be supported only by the screw shell of the
lampholder?
A
12 inches
B
P 4
C10 Electrical 09/11/2026
Exam
California CSLB C10 Electrical Exam 1 review
test bank with over 400 questions and correct
detailed answers
All 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed in bathrooms of dwelling units always
require _____.
A
twist-lock receptacles
B
ground-fault circuit-interrupter protection
C
non-grounded receptacles
P 1
, • California CSLB
C10 Electrical 09/11/2026
Exam
D
waterproof receptacle covers –
Correct Answer :The Correct Answer Is B
Many people have been electrocuted in bathrooms due to an electric appliance (radio, electric razor, etc.) falling
into the sink or bathtub where a person is in contact with the water. A GFCI prevents many such accidents.
The NEC allows wall-switch controlled receptacles in dwelling units in lieu of lighting outlets in all habitable rooms
except _____.
A
basement and attic
B
living and family rooms
C
bedrooms
D
kitchen and bath –
Correct Answer :The Correct Answer Is D
The NEC allows a switched receptacle in all rooms, in lieu of ceiling or wall-mounted lighting fixtures, except the
kitchen and bathroom.
Insulated conductors of No. 6 or smaller, intended for use as grounded conductors in a circuit must be either of
the following colors?
A
Blue or black
B
P 2
, • California CSLB
C10 Electrical 09/11/2026
Exam
Red or black
C
White, gray, or have three continuous white stripes on other than green insulation.
D
Orange or yellow –
Correct Answer :The Correct Answer Is C
Insulated conductors, No. 6 AWG and smaller, intended for use as grounded (neutral) conductors or circuits,
shall be identified by a continuous outer finish of a white or gray, or by three continuous white stripes along its
entire length on other than green insulation. Conductors larger than No. 6 AWG may use white markers at points
of termination.
Direct buried conductors and cables emerging from the ground shall be protected by an enclosure or raceway a
distance above ground of _____.
A
6 feet
B
8 feet
C
10 feet
D
12 feet - Correct Answer :The Correct Answer Is B
Conductors emerging from the ground are subject to damage from lawn mowers, weed eaters, and the like.
Therefore, they must be protected by some means. Metal conduit, such as EMT or rigid steel conduit are two
approved means of protection.
Cable tray systems must not be used _____.
P 3
, • California CSLB
C10 Electrical 09/11/2026
Exam
A
for power and control applications
B
for service-entrance systems
C
for signal cables
D
in hoistways - Correct Answer :The Correct Answer Is D
Wiring installations installed in hoistways are subject to physical damage. Cable trays, using open conductors, are
not permitted in such locations.
EMT shall be supported at least every _____.
A
4 feet
B
8 feet
C
10 feet
D
15 feet - Correct Answer :The Correct Answer Is C
EMT must be supported every 10 feet to prevent sag or collapse.
What is the maximum dimensions of a lighting fixture that may be supported only by the screw shell of the
lampholder?
A
12 inches
B
P 4
