Master Electrician Licensing Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
1. The primary purpose of a grounding conductor is to
a. carry current under normal operation
b. provide a path for fault current to the earth
c. reduce voltage drop
d. serve as a neutral conductor
Grounding conductors protect people and equipment by providing
a low-resistance path to earth for fault currents.
2. Which type of conduit is best suited for outdoor installation where
corrosion resistance is required?
a. RMC
b. EMT
c. PVC
d. IMC
PVC conduit is corrosion-resistant and suitable for outdoor use,
unlike EMT which may corrode.
3. The NEC requires GFCI protection in which of the following
locations?
a. Bedrooms
b. Bathrooms
, c. Living rooms
d. Closets
Bathrooms are considered wet locations where GFCI protection is
required to prevent electrical shock.
4. A three-phase, four-wire system with a 208Y/120V configuration
has a phase-to-phase voltage of
a. 120V
b. 208V
c. 208V
d. 240V
In a 208Y/120V system, the phase-to-phase voltage is 208V while
phase-to-neutral is 120V.
5. The ampacity of a conductor depends on
a. voltage drop only
b. conductor size, insulation type, and ambient temperature
c. number of outlets
d. color of the wire
Ampacity ratings account for the conductor’s thermal limits,
insulation, and environmental factors.
6. Which device automatically opens a circuit when an overload
occurs?
a. Transformer
b. Circuit breaker
c. Contactor
d. Fuse holder
Circuit breakers interrupt current flow during overloads to protect
conductors and equipment.
, 7. The main purpose of a neutral wire is to
a. provide ground
b. carry unbalanced current back to the source
c. act as a switch
d. increase voltage
The neutral carries current from the load back to the source in a
balanced or unbalanced system.
8. Which of the following is considered a wet location according to
the NEC?
a. Garage
b. Outdoor swimming pool area
c. Bedroom
d. Attic
Wet locations are areas exposed to water or rain, requiring specific
wiring methods and protection.
9. What is the maximum overcurrent protection for a 12 AWG
copper conductor used in general wiring?
a. 10A
b. 20A
c. 15A
d. 25A
According to NEC Table 310.16, a 12 AWG copper conductor is
rated for 20A in typical conditions.
10. The term “service entrance” refers to
a. the location of branch circuits
b. the point where utility power enters a building
c. the main panel distribution bus
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
1. The primary purpose of a grounding conductor is to
a. carry current under normal operation
b. provide a path for fault current to the earth
c. reduce voltage drop
d. serve as a neutral conductor
Grounding conductors protect people and equipment by providing
a low-resistance path to earth for fault currents.
2. Which type of conduit is best suited for outdoor installation where
corrosion resistance is required?
a. RMC
b. EMT
c. PVC
d. IMC
PVC conduit is corrosion-resistant and suitable for outdoor use,
unlike EMT which may corrode.
3. The NEC requires GFCI protection in which of the following
locations?
a. Bedrooms
b. Bathrooms
, c. Living rooms
d. Closets
Bathrooms are considered wet locations where GFCI protection is
required to prevent electrical shock.
4. A three-phase, four-wire system with a 208Y/120V configuration
has a phase-to-phase voltage of
a. 120V
b. 208V
c. 208V
d. 240V
In a 208Y/120V system, the phase-to-phase voltage is 208V while
phase-to-neutral is 120V.
5. The ampacity of a conductor depends on
a. voltage drop only
b. conductor size, insulation type, and ambient temperature
c. number of outlets
d. color of the wire
Ampacity ratings account for the conductor’s thermal limits,
insulation, and environmental factors.
6. Which device automatically opens a circuit when an overload
occurs?
a. Transformer
b. Circuit breaker
c. Contactor
d. Fuse holder
Circuit breakers interrupt current flow during overloads to protect
conductors and equipment.
, 7. The main purpose of a neutral wire is to
a. provide ground
b. carry unbalanced current back to the source
c. act as a switch
d. increase voltage
The neutral carries current from the load back to the source in a
balanced or unbalanced system.
8. Which of the following is considered a wet location according to
the NEC?
a. Garage
b. Outdoor swimming pool area
c. Bedroom
d. Attic
Wet locations are areas exposed to water or rain, requiring specific
wiring methods and protection.
9. What is the maximum overcurrent protection for a 12 AWG
copper conductor used in general wiring?
a. 10A
b. 20A
c. 15A
d. 25A
According to NEC Table 310.16, a 12 AWG copper conductor is
rated for 20A in typical conditions.
10. The term “service entrance” refers to
a. the location of branch circuits
b. the point where utility power enters a building
c. the main panel distribution bus
