Michigan Journeyman Electrician Exam
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of an equipment grounding conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To provide a low-impedance path for fault current
D. To limit the operating current of a load
Rationale: The equipment grounding conductor provides a conductive path for
fault current back to the source so that the overcurrent protective device can
operate promptly. It is not intended to carry normal load current.
2. Which NEC chapter primarily contains requirements for wiring methods and
materials?
A. Chapter 1
B. Chapter 3
C. Chapter 5
D. Chapter 7
Rationale: NEC Chapter 3 covers wiring methods and materials, including
conductors, raceways, cable assemblies, and related installation requirements.
3. A continuous load is generally calculated at what percentage of its expected
load for conductor and overcurrent protection sizing?
,A. 80%
B. 100%
C. 125%
D. 150%
Rationale: A continuous load is generally treated as 125% of its actual load when
sizing conductors and overcurrent protection under the applicable NEC
requirements.
4. What is the main function of a circuit breaker?
A. To increase available fault current
B. To provide a neutral connection
C. To regulate line voltage
D. To open a circuit when excessive current occurs
Rationale: A circuit breaker protects conductors and equipment by interrupting
current when an overcurrent condition occurs within its rated operating
characteristics.
5. Which conductor is normally identified as the grounded conductor in a
standard 120/240-volt single-phase system?
A. Green conductor
B. White or gray conductor
C. Bare copper conductor
D. Orange conductor
Rationale: The grounded circuit conductor is generally identified by white or gray
insulation or other permitted identification methods. Green and bare conductors
are generally associated with equipment grounding.
6. What is the primary purpose of bonding?
A. To increase circuit resistance
B. To reduce conductor ampacity
,C. To establish electrical continuity between conductive parts
D. To eliminate the need for overcurrent protection
Rationale: Bonding connects normally non-current-carrying conductive parts
together so they remain at substantially the same electrical potential and can
carry fault current effectively.
7. A 120-volt load draws 10 amperes. What is its approximate power
consumption?
A. 12 watts
B. 120 watts
C. 1,200 watts
D. 12,000 watts
Rationale: Using P = E × I, the power is 120 volts × 10 amperes = 1,200 watts.
8. Which raceway is commonly manufactured from rigid metal and provides
substantial mechanical protection?
A. ENT
B. PVC
C. RMC
D. FMC
Rationale: Rigid metal conduit (RMC) is a heavy-duty metallic raceway that
provides strong mechanical protection for conductors.
9. What is the primary purpose of conductor ampacity?
A. To determine conductor color
B. To establish the maximum current a conductor can carry under specified
conditions
C. To determine the circuit voltage
D. To determine the number of outlets permitted
, Rationale: Ampacity is the maximum current a conductor can carry continuously
under its specified conditions of use without exceeding its temperature rating.
10. Which factor can require adjustment of conductor ampacity when several
current-carrying conductors are installed together?
A. The color of the insulation
B. The length of the raceway only
C. The type of wall covering
D. The number of current-carrying conductors
Rationale: Multiple current-carrying conductors in a raceway, cable, or other
enclosure can increase heat accumulation. The NEC provides adjustment factors
that can reduce allowable ampacity.
11. What is the purpose of a service disconnect?
A. To increase the service voltage
B. To provide a branch-circuit neutral
C. To disconnect the building's electrical service from the source
D. To replace all branch-circuit breakers
Rationale: The service disconnecting means provides a means of disconnecting the
building or structure from the electrical supply.
12. Which device is specifically intended to detect certain leakage currents to
ground and rapidly interrupt a circuit?
A. AFCI
B. GFCI
C. Transformer
D. Disconnect switch
Rationale: A ground-fault circuit interrupter monitors the relationship between
current leaving and returning on circuit conductors and interrupts the circuit when
a qualifying ground-fault imbalance is detected.
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of an equipment grounding conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To provide a low-impedance path for fault current
D. To limit the operating current of a load
Rationale: The equipment grounding conductor provides a conductive path for
fault current back to the source so that the overcurrent protective device can
operate promptly. It is not intended to carry normal load current.
2. Which NEC chapter primarily contains requirements for wiring methods and
materials?
A. Chapter 1
B. Chapter 3
C. Chapter 5
D. Chapter 7
Rationale: NEC Chapter 3 covers wiring methods and materials, including
conductors, raceways, cable assemblies, and related installation requirements.
3. A continuous load is generally calculated at what percentage of its expected
load for conductor and overcurrent protection sizing?
,A. 80%
B. 100%
C. 125%
D. 150%
Rationale: A continuous load is generally treated as 125% of its actual load when
sizing conductors and overcurrent protection under the applicable NEC
requirements.
4. What is the main function of a circuit breaker?
A. To increase available fault current
B. To provide a neutral connection
C. To regulate line voltage
D. To open a circuit when excessive current occurs
Rationale: A circuit breaker protects conductors and equipment by interrupting
current when an overcurrent condition occurs within its rated operating
characteristics.
5. Which conductor is normally identified as the grounded conductor in a
standard 120/240-volt single-phase system?
A. Green conductor
B. White or gray conductor
C. Bare copper conductor
D. Orange conductor
Rationale: The grounded circuit conductor is generally identified by white or gray
insulation or other permitted identification methods. Green and bare conductors
are generally associated with equipment grounding.
6. What is the primary purpose of bonding?
A. To increase circuit resistance
B. To reduce conductor ampacity
,C. To establish electrical continuity between conductive parts
D. To eliminate the need for overcurrent protection
Rationale: Bonding connects normally non-current-carrying conductive parts
together so they remain at substantially the same electrical potential and can
carry fault current effectively.
7. A 120-volt load draws 10 amperes. What is its approximate power
consumption?
A. 12 watts
B. 120 watts
C. 1,200 watts
D. 12,000 watts
Rationale: Using P = E × I, the power is 120 volts × 10 amperes = 1,200 watts.
8. Which raceway is commonly manufactured from rigid metal and provides
substantial mechanical protection?
A. ENT
B. PVC
C. RMC
D. FMC
Rationale: Rigid metal conduit (RMC) is a heavy-duty metallic raceway that
provides strong mechanical protection for conductors.
9. What is the primary purpose of conductor ampacity?
A. To determine conductor color
B. To establish the maximum current a conductor can carry under specified
conditions
C. To determine the circuit voltage
D. To determine the number of outlets permitted
, Rationale: Ampacity is the maximum current a conductor can carry continuously
under its specified conditions of use without exceeding its temperature rating.
10. Which factor can require adjustment of conductor ampacity when several
current-carrying conductors are installed together?
A. The color of the insulation
B. The length of the raceway only
C. The type of wall covering
D. The number of current-carrying conductors
Rationale: Multiple current-carrying conductors in a raceway, cable, or other
enclosure can increase heat accumulation. The NEC provides adjustment factors
that can reduce allowable ampacity.
11. What is the purpose of a service disconnect?
A. To increase the service voltage
B. To provide a branch-circuit neutral
C. To disconnect the building's electrical service from the source
D. To replace all branch-circuit breakers
Rationale: The service disconnecting means provides a means of disconnecting the
building or structure from the electrical supply.
12. Which device is specifically intended to detect certain leakage currents to
ground and rapidly interrupt a circuit?
A. AFCI
B. GFCI
C. Transformer
D. Disconnect switch
Rationale: A ground-fault circuit interrupter monitors the relationship between
current leaving and returning on circuit conductors and interrupts the circuit when
a qualifying ground-fault imbalance is detected.
