Master Electrician Licensing Exam Practice
with Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the primary responsibility of a master electrician?
A. Installing residential wiring only
B. Performing electrical inspections for utilities
C. Designing, supervising, and assuming responsibility for electrical
systems
D. Manufacturing electrical equipment
Italicized rationale: A master electrician is legally responsible for system
design, supervision, and code compliance.
2. What NEC article covers grounding and bonding?
A. Article 110
B. Article 210
C. Article 250
D. Article 300
Italicized rationale: Article 250 establishes grounding and bonding
requirements.
3. What is the maximum allowable voltage drop recommended for
branch circuits?
A. 1%
B. 2%
,C. 3%
D. 5%
Italicized rationale: The NEC recommends a maximum of 3% voltage
drop for branch circuits.
4. Conductors are sized primarily based on which factor?
A. Length
B. Color
C. Ampacity
D. Insulation thickness
Italicized rationale: Ampacity determines the current-carrying capacity
of conductors.
5. What type of grounding electrode has the lowest resistance to
earth?
A. Rod electrode
B. Plate electrode
C. Concrete-encased electrode
D. Pipe electrode
Italicized rationale: Concrete-encased electrodes provide superior earth
contact.
6. What is the minimum working space depth required for equipment
up to 150 volts?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
, Italicized rationale: NEC requires a minimum of 36 inches of clear
working space.
7. What NEC article governs overcurrent protection?
A. Article 110
B. Article 240
C. Article 250
D. Article 310
Italicized rationale: Article 240 covers overcurrent protection devices.
8. What device protects against ground faults?
A. AFCI
B. Fuse
C. GFCI
D. Circuit breaker
Italicized rationale: GFCIs protect people from ground-fault shock
hazards.
9. What is the standard frequency of AC power in the United States?
A. 50 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Italicized rationale: The U.S. standard frequency is 60 hertz.
10. What type of current flows in one direction only?
A. Alternating current
with Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary responsibility of a master electrician?
A. Installing residential wiring only
B. Performing electrical inspections for utilities
C. Designing, supervising, and assuming responsibility for electrical
systems
D. Manufacturing electrical equipment
Italicized rationale: A master electrician is legally responsible for system
design, supervision, and code compliance.
2. What NEC article covers grounding and bonding?
A. Article 110
B. Article 210
C. Article 250
D. Article 300
Italicized rationale: Article 250 establishes grounding and bonding
requirements.
3. What is the maximum allowable voltage drop recommended for
branch circuits?
A. 1%
B. 2%
,C. 3%
D. 5%
Italicized rationale: The NEC recommends a maximum of 3% voltage
drop for branch circuits.
4. Conductors are sized primarily based on which factor?
A. Length
B. Color
C. Ampacity
D. Insulation thickness
Italicized rationale: Ampacity determines the current-carrying capacity
of conductors.
5. What type of grounding electrode has the lowest resistance to
earth?
A. Rod electrode
B. Plate electrode
C. Concrete-encased electrode
D. Pipe electrode
Italicized rationale: Concrete-encased electrodes provide superior earth
contact.
6. What is the minimum working space depth required for equipment
up to 150 volts?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
, Italicized rationale: NEC requires a minimum of 36 inches of clear
working space.
7. What NEC article governs overcurrent protection?
A. Article 110
B. Article 240
C. Article 250
D. Article 310
Italicized rationale: Article 240 covers overcurrent protection devices.
8. What device protects against ground faults?
A. AFCI
B. Fuse
C. GFCI
D. Circuit breaker
Italicized rationale: GFCIs protect people from ground-fault shock
hazards.
9. What is the standard frequency of AC power in the United States?
A. 50 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Italicized rationale: The U.S. standard frequency is 60 hertz.
10. What type of current flows in one direction only?
A. Alternating current
