CALIFORNIA CONTRACTORS STATE LICENSE
BOARD (CSLB) ELECTRICAL CONTRACTOR
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026
Q&A | INSTANT DOWNLOAD PDF
1. Which type of conduit is most suitable for wet locations?
A) EMT
B) PVC
C) RMC
D) FMC
C) RMC
RMC (Rigid Metal Conduit) is approved for wet locations due to its
durability and moisture resistance.
2. What is the standard voltage for most residential circuits in
California?
A) 120/240V
B) 208V
C) 277/480V
D) 600V
A) 120/240V
Residential homes typically use 120/240 volts single-phase for lighting
and appliances.
,3. Ground-fault circuit interrupters (GFCIs) are required in which
areas?
A) Living rooms
B) Kitchens and bathrooms
C) Bedrooms
D) Attics
B) Kitchens and bathrooms
GFCIs protect against electrical shock in areas with water, such as
kitchens, bathrooms, and outdoors.
4. What color is typically used for equipment grounding conductors?
A) Black
B) White
C) Green
D) Red
C) Green
Green (or bare copper) is the standard color for grounding conductors.
5. What is the maximum breaker size allowed for a 14 AWG copper
conductor?
A) 15A
B) 20A
C) 30A
D) 40A
,A) 15A
According to NEC, 14 AWG copper is rated for 15 amps maximum.
6. Which device is used to protect circuits from overload?
A) Fuse
B) GFCI
C) Transformer
D) Conduit
A) Fuse
Fuses and circuit breakers are designed to prevent overheating by
interrupting overload currents.
7. In a 120/240V single-phase system, what is the voltage between
the two hot conductors?
A) 120V
B) 240V
C) 208V
D) 480V
B) 240V
The voltage between two hot conductors in single-phase 120/240V is
240 volts.
8. The main purpose of an electrical panel is to:
A) Store electricity
B) Distribute electricity and protect circuits
, C) Convert AC to DC
D) Increase voltage
B) Distribute electricity and protect circuits
Panels house breakers that distribute power and protect wiring from
overload.
9. What is the minimum depth for burying a PVC conduit under a
driveway?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
C) 18 inches
NEC requires at least 18 inches for PVC conduits under driveways to
prevent damage.
10. Which of the following is a NEC-approved method for splicing
conductors?
A) Twisting and taping
B) Wire nuts
C) Crimping only
D) Soldering only
B) Wire nuts
Wire nuts are a standard, code-approved method for splicing electrical
wires safely.
BOARD (CSLB) ELECTRICAL CONTRACTOR
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026
Q&A | INSTANT DOWNLOAD PDF
1. Which type of conduit is most suitable for wet locations?
A) EMT
B) PVC
C) RMC
D) FMC
C) RMC
RMC (Rigid Metal Conduit) is approved for wet locations due to its
durability and moisture resistance.
2. What is the standard voltage for most residential circuits in
California?
A) 120/240V
B) 208V
C) 277/480V
D) 600V
A) 120/240V
Residential homes typically use 120/240 volts single-phase for lighting
and appliances.
,3. Ground-fault circuit interrupters (GFCIs) are required in which
areas?
A) Living rooms
B) Kitchens and bathrooms
C) Bedrooms
D) Attics
B) Kitchens and bathrooms
GFCIs protect against electrical shock in areas with water, such as
kitchens, bathrooms, and outdoors.
4. What color is typically used for equipment grounding conductors?
A) Black
B) White
C) Green
D) Red
C) Green
Green (or bare copper) is the standard color for grounding conductors.
5. What is the maximum breaker size allowed for a 14 AWG copper
conductor?
A) 15A
B) 20A
C) 30A
D) 40A
,A) 15A
According to NEC, 14 AWG copper is rated for 15 amps maximum.
6. Which device is used to protect circuits from overload?
A) Fuse
B) GFCI
C) Transformer
D) Conduit
A) Fuse
Fuses and circuit breakers are designed to prevent overheating by
interrupting overload currents.
7. In a 120/240V single-phase system, what is the voltage between
the two hot conductors?
A) 120V
B) 240V
C) 208V
D) 480V
B) 240V
The voltage between two hot conductors in single-phase 120/240V is
240 volts.
8. The main purpose of an electrical panel is to:
A) Store electricity
B) Distribute electricity and protect circuits
, C) Convert AC to DC
D) Increase voltage
B) Distribute electricity and protect circuits
Panels house breakers that distribute power and protect wiring from
overload.
9. What is the minimum depth for burying a PVC conduit under a
driveway?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
C) 18 inches
NEC requires at least 18 inches for PVC conduits under driveways to
prevent damage.
10. Which of the following is a NEC-approved method for splicing
conductors?
A) Twisting and taping
B) Wire nuts
C) Crimping only
D) Soldering only
B) Wire nuts
Wire nuts are a standard, code-approved method for splicing electrical
wires safely.
