MASTER ELECTRICIAN LICENSING EXAM
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. What is the primary purpose of grounding in an electrical system?
A. Improve power factor
B. Reduce voltage drop
C. Protect equipment from overload
D. Provide a low-resistance path for fault current
Answer: D
Rationale: Grounding safely directs fault current to earth, reducing shock
and fire hazards.
2. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 210
C. Article 250
D. Article 300
Answer: C
Rationale: NEC Article 250 specifically addresses grounding and bonding
requirements.
3. What is the maximum allowable voltage drop recommended for branch
circuits?
A. 1%
B. 2%
C. 3%
D. 5%
, Answer: C
Rationale: NEC recommends a maximum of 3% voltage drop for branch
circuits.
4. Which conductor is intentionally grounded in a typical residential system?
A. Equipment grounding conductor
B. Neutral conductor
C. Hot conductor
D. Bonding jumper
Answer: B
Rationale: The neutral conductor is intentionally grounded at the service
disconnect.
5. What device protects against ground faults?
A. AFCI
B. Fuse
C. GFCI
D. Circuit breaker
Answer: C
Rationale: GFCIs protect against ground-fault shock hazards.
6. What is the minimum working space required in front of electrical panels
(≤600V)?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
Answer: C
Rationale: NEC requires at least 36 inches of clear working space.
7. Which wire insulation type is rated for wet locations?
A. NM
B. THHN
C. THWN
D. UF
, Answer: C
Rationale: THWN insulation is rated for wet locations.
8. What does AFCI protection primarily prevent?
A. Overcurrent
B. Ground faults
C. Arc faults
D. Short circuits
Answer: C
Rationale: AFCIs detect and interrupt dangerous arc faults.
9. What is the purpose of bonding?
A. Limit voltage drop
B. Equalize potential between conductive parts
C. Increase system voltage
D. Improve insulation
Answer: B
Rationale: Bonding ensures all conductive parts are at the same electrical
potential.
10.What is the standard residential service voltage in North America?
A. 120V
B. 208V
C. 240V
D. 277V
Answer: C
Rationale: Residential service is typically 120/240V single-phase.
11.Which conductor size is required for a 20A branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. What is the primary purpose of grounding in an electrical system?
A. Improve power factor
B. Reduce voltage drop
C. Protect equipment from overload
D. Provide a low-resistance path for fault current
Answer: D
Rationale: Grounding safely directs fault current to earth, reducing shock
and fire hazards.
2. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 210
C. Article 250
D. Article 300
Answer: C
Rationale: NEC Article 250 specifically addresses grounding and bonding
requirements.
3. What is the maximum allowable voltage drop recommended for branch
circuits?
A. 1%
B. 2%
C. 3%
D. 5%
, Answer: C
Rationale: NEC recommends a maximum of 3% voltage drop for branch
circuits.
4. Which conductor is intentionally grounded in a typical residential system?
A. Equipment grounding conductor
B. Neutral conductor
C. Hot conductor
D. Bonding jumper
Answer: B
Rationale: The neutral conductor is intentionally grounded at the service
disconnect.
5. What device protects against ground faults?
A. AFCI
B. Fuse
C. GFCI
D. Circuit breaker
Answer: C
Rationale: GFCIs protect against ground-fault shock hazards.
6. What is the minimum working space required in front of electrical panels
(≤600V)?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
Answer: C
Rationale: NEC requires at least 36 inches of clear working space.
7. Which wire insulation type is rated for wet locations?
A. NM
B. THHN
C. THWN
D. UF
, Answer: C
Rationale: THWN insulation is rated for wet locations.
8. What does AFCI protection primarily prevent?
A. Overcurrent
B. Ground faults
C. Arc faults
D. Short circuits
Answer: C
Rationale: AFCIs detect and interrupt dangerous arc faults.
9. What is the purpose of bonding?
A. Limit voltage drop
B. Equalize potential between conductive parts
C. Increase system voltage
D. Improve insulation
Answer: B
Rationale: Bonding ensures all conductive parts are at the same electrical
potential.
10.What is the standard residential service voltage in North America?
A. 120V
B. 208V
C. 240V
D. 277V
Answer: C
Rationale: Residential service is typically 120/240V single-phase.
11.Which conductor size is required for a 20A branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
