Maryland Master Electrician Certification
Practice Examination Newest (2026
Update) Actual Practice Questions – Set
100 Most Common Exam Questions And
Answers In Details 100% Verified Exam
1. A feeder supplying a continuous load of 80A must have a minimum
ampacity of:
A. 80A
B. 90A
C. 100A
D. 125A
✔ Correct Answer: C (100A)
Explanation: Continuous loads require 125% sizing; 80A × 1.25 = 100A.
2. What is the minimum burial depth for direct-buried residential branch
circuits rated 120V or less with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
✔ Correct Answer: B (12 inches)
Explanation: NEC allows 12 inches for GFCI-protected residential circuits
under specific conditions.
3. Conductors used for grounding electrode systems must be:
A. Stranded only
B. Solid only
C. Copper or aluminum
, D. Insulated only
✔ Correct Answer: C (Copper or aluminum)
Explanation: NEC permits copper or aluminum grounding electrode
conductors.
4. What is the maximum number of conductors in a 4-inch square box with a
single-gang plaster ring (assuming #12 conductors)?
A. 9
B. 12
C. 15
D. 18
✔ Correct Answer: B (12)
Explanation: Box fill calculations assign 2.25 cubic inches per #12
conductor.
5. A 20A circuit using #12 copper conductors has a maximum voltage drop
recommendation of:
A. 1%
B. 3%
C. 5%
D. 10%
✔ Correct Answer: B (3%)
Explanation: NEC recommends a maximum 3% voltage drop for branch
circuits.
6. What type of motor protection is required for overload conditions?
A. Short-circuit protection
B. Ground-fault protection
C. Overload protection
D. Thermal protection only
✔ Correct Answer: C (Overload protection)
Explanation: Motors must have overload protection to prevent
overheating.
, 7. The minimum working space depth in front of electrical equipment rated
600V or less is:
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
✔ Correct Answer: C (36 inches)
Explanation: NEC requires 36 inches of clearance in most cases.
8. What is the minimum conductor size for a 100A residential service using
copper?
A. #6 AWG
B. #4 AWG
C. #3 AWG
D. #2 AWG
✔ Correct Answer: C (#3 AWG)
Explanation: NEC Table 310.16 specifies #3 copper for 100A service.
9. Ground-fault circuit interrupter protection is required in:
A. Bedrooms
B. Kitchens
C. Living rooms
D. Closets
✔ Correct Answer: B (Kitchens)
Explanation: GFCI is required for countertop receptacles in kitchens.
10.What is the maximum overcurrent protection for #14 copper conductors?
A. 10A
B. 15A
C. 20A
D. 25A
✔ Correct Answer: B (15A)
Explanation: NEC limits #14 copper to 15 amps.
Practice Examination Newest (2026
Update) Actual Practice Questions – Set
100 Most Common Exam Questions And
Answers In Details 100% Verified Exam
1. A feeder supplying a continuous load of 80A must have a minimum
ampacity of:
A. 80A
B. 90A
C. 100A
D. 125A
✔ Correct Answer: C (100A)
Explanation: Continuous loads require 125% sizing; 80A × 1.25 = 100A.
2. What is the minimum burial depth for direct-buried residential branch
circuits rated 120V or less with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
✔ Correct Answer: B (12 inches)
Explanation: NEC allows 12 inches for GFCI-protected residential circuits
under specific conditions.
3. Conductors used for grounding electrode systems must be:
A. Stranded only
B. Solid only
C. Copper or aluminum
, D. Insulated only
✔ Correct Answer: C (Copper or aluminum)
Explanation: NEC permits copper or aluminum grounding electrode
conductors.
4. What is the maximum number of conductors in a 4-inch square box with a
single-gang plaster ring (assuming #12 conductors)?
A. 9
B. 12
C. 15
D. 18
✔ Correct Answer: B (12)
Explanation: Box fill calculations assign 2.25 cubic inches per #12
conductor.
5. A 20A circuit using #12 copper conductors has a maximum voltage drop
recommendation of:
A. 1%
B. 3%
C. 5%
D. 10%
✔ Correct Answer: B (3%)
Explanation: NEC recommends a maximum 3% voltage drop for branch
circuits.
6. What type of motor protection is required for overload conditions?
A. Short-circuit protection
B. Ground-fault protection
C. Overload protection
D. Thermal protection only
✔ Correct Answer: C (Overload protection)
Explanation: Motors must have overload protection to prevent
overheating.
, 7. The minimum working space depth in front of electrical equipment rated
600V or less is:
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
✔ Correct Answer: C (36 inches)
Explanation: NEC requires 36 inches of clearance in most cases.
8. What is the minimum conductor size for a 100A residential service using
copper?
A. #6 AWG
B. #4 AWG
C. #3 AWG
D. #2 AWG
✔ Correct Answer: C (#3 AWG)
Explanation: NEC Table 310.16 specifies #3 copper for 100A service.
9. Ground-fault circuit interrupter protection is required in:
A. Bedrooms
B. Kitchens
C. Living rooms
D. Closets
✔ Correct Answer: B (Kitchens)
Explanation: GFCI is required for countertop receptacles in kitchens.
10.What is the maximum overcurrent protection for #14 copper conductors?
A. 10A
B. 15A
C. 20A
D. 25A
✔ Correct Answer: B (15A)
Explanation: NEC limits #14 copper to 15 amps.
