Master Electrician Licensing Exam With
Actual Questions & Verified Answers,
Plus Explained Rationales/Expert
Verified For Guaranteed Pass
2026/Latest Updated/Instant Download
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1. What is the primary purpose of the grounding electrode system in
an electrical installation?
A. To provide a return path for normal current
B. To stabilize voltage to ground and dissipate surges
C. To increase fault current
D. To replace equipment grounding conductors
Answer: B
The grounding electrode system stabilizes the electrical system
voltage relative to earth and safely dissipates lightning, line
surges, and unintentional contact with higher-voltage lines.
2. Which conductor is permitted to be grounded at more than one
point in a premises wiring system?
A. Equipment grounding conductor
B. Grounding electrode conductor
C. Grounded (neutral) conductor
D. Ungrounded conductor
Answer: C
The grounded (neutral) conductor is permitted to be grounded at
, the service disconnect and under specific conditions, such as
separately derived systems.
3. What is the minimum working space depth required in front of
electrical equipment rated 600 volts or less?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
Answer: C
A minimum of 36 inches of clear working space is required in
front of electrical equipment to allow safe operation and
maintenance.
4. Which overcurrent device provides both short-circuit and
overload protection?
A. Thermal relay
B. Fuse
C. Ground-fault relay
D. Surge protector
Answer: B
Fuses are designed to open the circuit under both overload and
short-circuit conditions.
5. What is the maximum allowable voltage drop for a branch circuit
feeder combined under recommended practice?
A. 3%
B. 4%
C. 5%
D. 10%
Answer: C
, Recommended practice limits total voltage drop to 5% to ensure
efficient operation of equipment.
6. What type of wiring method is required in a Class I, Division 1
hazardous location?
A. NM cable
B. EMT
C. Rigid metal conduit
D. PVC conduit
Answer: C
Rigid metal conduit provides the highest level of mechanical
protection and containment required in Class I, Division 1
locations.
7. What is the purpose of an arc-fault circuit interrupter (AFCI)?
A. Protect against ground faults
B. Protect equipment from surges
C. Protect against arcing faults that can cause fires
D. Limit short-circuit current
Answer: C
AFCIs are designed to detect dangerous arcing conditions that
could ignite surrounding materials.
8. Which factor most affects conductor ampacity?
A. Color
B. Insulation temperature rating
C. Length
D. Voltage rating
Answer: B
The insulation temperature rating determines how much heat a
conductor can safely withstand, directly affecting ampacity.
Actual Questions & Verified Answers,
Plus Explained Rationales/Expert
Verified For Guaranteed Pass
2026/Latest Updated/Instant Download
1. What is the primary purpose of the grounding electrode system in
an electrical installation?
A. To provide a return path for normal current
B. To stabilize voltage to ground and dissipate surges
C. To increase fault current
D. To replace equipment grounding conductors
Answer: B
The grounding electrode system stabilizes the electrical system
voltage relative to earth and safely dissipates lightning, line
surges, and unintentional contact with higher-voltage lines.
2. Which conductor is permitted to be grounded at more than one
point in a premises wiring system?
A. Equipment grounding conductor
B. Grounding electrode conductor
C. Grounded (neutral) conductor
D. Ungrounded conductor
Answer: C
The grounded (neutral) conductor is permitted to be grounded at
, the service disconnect and under specific conditions, such as
separately derived systems.
3. What is the minimum working space depth required in front of
electrical equipment rated 600 volts or less?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
Answer: C
A minimum of 36 inches of clear working space is required in
front of electrical equipment to allow safe operation and
maintenance.
4. Which overcurrent device provides both short-circuit and
overload protection?
A. Thermal relay
B. Fuse
C. Ground-fault relay
D. Surge protector
Answer: B
Fuses are designed to open the circuit under both overload and
short-circuit conditions.
5. What is the maximum allowable voltage drop for a branch circuit
feeder combined under recommended practice?
A. 3%
B. 4%
C. 5%
D. 10%
Answer: C
, Recommended practice limits total voltage drop to 5% to ensure
efficient operation of equipment.
6. What type of wiring method is required in a Class I, Division 1
hazardous location?
A. NM cable
B. EMT
C. Rigid metal conduit
D. PVC conduit
Answer: C
Rigid metal conduit provides the highest level of mechanical
protection and containment required in Class I, Division 1
locations.
7. What is the purpose of an arc-fault circuit interrupter (AFCI)?
A. Protect against ground faults
B. Protect equipment from surges
C. Protect against arcing faults that can cause fires
D. Limit short-circuit current
Answer: C
AFCIs are designed to detect dangerous arcing conditions that
could ignite surrounding materials.
8. Which factor most affects conductor ampacity?
A. Color
B. Insulation temperature rating
C. Length
D. Voltage rating
Answer: B
The insulation temperature rating determines how much heat a
conductor can safely withstand, directly affecting ampacity.
