Master Electrician Licensing Examination Questions
And Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A |Already graded A+
1. According to the NEC, which article governs electrical services?
A. Article 210
B. Article 220
C. Article 230
D. Article 250
Answer: C
Article 230 specifically covers services, including service conductors and
equipment.
2. What is the minimum working space depth required in front of electrical
equipment rated 0–150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Answer: B
NEC 110.26 requires a minimum of 36 inches of clear working space.
3. Which grounding electrode has the lowest resistance to earth?
A. Concrete-encased electrode
B. Ground ring
C. Metal underground water pipe
D. Rod electrode
Answer: C
Metal underground water piping provides excellent earth contact when
properly installed.
,4. What is the minimum burial depth for rigid metal conduit (RMC) under
residential driveways?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B
NEC Table 300.5 allows 12 inches for RMC under driveways.
5. A continuous load is defined as a load expected to run for how long?
A. 1 hour
B. 2 hours
C. 3 hours or more
D. 4 hours
Answer: C
NEC Article 100 defines a continuous load as operating for 3 hours or more.
6. What is the maximum allowable voltage drop for a branch circuit?
A. 2%
B. 3%
C. 4%
D. 5%
Answer: B
NEC recommends no more than 3% voltage drop on branch circuits.
7. Which conductor is permitted to be bare?
A. Neutral
B. Ungrounded conductor
C. Equipment grounding conductor
D. Service conductor
, Answer: C
Equipment grounding conductors may be bare per NEC 250.
8. What type of fire extinguisher should be used on energized electrical
equipment?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: C
Class C extinguishers are rated for energized electrical fires.
9. What is the maximum overcurrent protection allowed for 12 AWG copper
conductors?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
Answer: B
NEC Table 310.16 limits 12 AWG copper to 20 amps.
10. What NEC article covers hazardous (classified) locations?
A. Article 500
B. Articles 500–516
C. Article 430
D. Article 725
Answer: B
Hazardous locations are covered in Articles 500 through 516.
11. What is the minimum size copper grounding electrode conductor for a
200-amp service?
And Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A |Already graded A+
1. According to the NEC, which article governs electrical services?
A. Article 210
B. Article 220
C. Article 230
D. Article 250
Answer: C
Article 230 specifically covers services, including service conductors and
equipment.
2. What is the minimum working space depth required in front of electrical
equipment rated 0–150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Answer: B
NEC 110.26 requires a minimum of 36 inches of clear working space.
3. Which grounding electrode has the lowest resistance to earth?
A. Concrete-encased electrode
B. Ground ring
C. Metal underground water pipe
D. Rod electrode
Answer: C
Metal underground water piping provides excellent earth contact when
properly installed.
,4. What is the minimum burial depth for rigid metal conduit (RMC) under
residential driveways?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B
NEC Table 300.5 allows 12 inches for RMC under driveways.
5. A continuous load is defined as a load expected to run for how long?
A. 1 hour
B. 2 hours
C. 3 hours or more
D. 4 hours
Answer: C
NEC Article 100 defines a continuous load as operating for 3 hours or more.
6. What is the maximum allowable voltage drop for a branch circuit?
A. 2%
B. 3%
C. 4%
D. 5%
Answer: B
NEC recommends no more than 3% voltage drop on branch circuits.
7. Which conductor is permitted to be bare?
A. Neutral
B. Ungrounded conductor
C. Equipment grounding conductor
D. Service conductor
, Answer: C
Equipment grounding conductors may be bare per NEC 250.
8. What type of fire extinguisher should be used on energized electrical
equipment?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: C
Class C extinguishers are rated for energized electrical fires.
9. What is the maximum overcurrent protection allowed for 12 AWG copper
conductors?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
Answer: B
NEC Table 310.16 limits 12 AWG copper to 20 amps.
10. What NEC article covers hazardous (classified) locations?
A. Article 500
B. Articles 500–516
C. Article 430
D. Article 725
Answer: B
Hazardous locations are covered in Articles 500 through 516.
11. What is the minimum size copper grounding electrode conductor for a
200-amp service?
