Maryland Master Electrician Exam With Actual
Questions & Correct Answers, Plus
Rationales/Expert Verified For Guaranteed Pass
2026/Latest Update/Instant Download Pdf
1. What is the standard voltage for single-phase residential service in
Maryland under typical NEC application?
A. 120V only
B. 240V only
C. 120/240V
D. 208/240V
Answer: C
Rationale: Most residential services use a 120/240V split-phase system
to supply both general lighting (120V) and major appliances (240V).
2. The primary purpose of a grounding electrode system is to:
A. Increase circuit voltage
B. Stabilize voltage to earth and provide fault current path
C. Reduce load demand
D. Replace overcurrent protection
Answer: B
Rationale: Grounding electrodes stabilize system voltage relative to
earth and provide a low-impedance path for fault currents.
3. What size copper grounding electrode conductor is generally
required for a 200A service (NEC typical)?
A. 6 AWG
B. 4 AWG
C. 2 AWG
D. 8 AWG
,Answer: B
Rationale: A 200A service typically requires at least 4 AWG copper
grounding electrode conductor per NEC sizing rules.
4. Which device is designed to protect against ground-fault leakage?
A. AFCI
B. GFCI
C. MCCB
D. Disconnect switch
Answer: B
Rationale: GFCI devices trip when they detect imbalance between hot
and neutral conductors, indicating ground-fault leakage.
5. The minimum number of lighting outlets required in a dwelling
unit living room is:
A. One
B. Two
C. Three
D. None required
Answer: A
Rationale: NEC requires at least one lighting outlet in habitable rooms
in dwelling units.
6. What is the purpose of an AFCI breaker?
A. Protect against overloads
B. Protect against arc faults
C. Protect against lightning
D. Provide grounding
Answer: B
Rationale: AFCIs detect dangerous arcing conditions that could lead to
electrical fires.
, 7. The color of equipment grounding conductors must be:
A. White
B. Green or bare
C. Black
D. Red
Answer: B
Rationale: Equipment grounding conductors must be green, green with
yellow stripe, or bare copper.
8. What is the typical frequency of electrical power in the United
States?
A. 50 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Answer: B
Rationale: The standard frequency in the U.S. electrical system is 60
Hz.
9. A continuous load is defined as a load operating at maximum
current for:
A. 30 minutes or more
B. 1 hour or more
C. 3 hours or more
D. 5 hours or more
Answer: C
Rationale: NEC defines continuous loads as those expected to run for
three hours or longer.
10. The main function of a circuit breaker is to:
A. Store energy
Questions & Correct Answers, Plus
Rationales/Expert Verified For Guaranteed Pass
2026/Latest Update/Instant Download Pdf
1. What is the standard voltage for single-phase residential service in
Maryland under typical NEC application?
A. 120V only
B. 240V only
C. 120/240V
D. 208/240V
Answer: C
Rationale: Most residential services use a 120/240V split-phase system
to supply both general lighting (120V) and major appliances (240V).
2. The primary purpose of a grounding electrode system is to:
A. Increase circuit voltage
B. Stabilize voltage to earth and provide fault current path
C. Reduce load demand
D. Replace overcurrent protection
Answer: B
Rationale: Grounding electrodes stabilize system voltage relative to
earth and provide a low-impedance path for fault currents.
3. What size copper grounding electrode conductor is generally
required for a 200A service (NEC typical)?
A. 6 AWG
B. 4 AWG
C. 2 AWG
D. 8 AWG
,Answer: B
Rationale: A 200A service typically requires at least 4 AWG copper
grounding electrode conductor per NEC sizing rules.
4. Which device is designed to protect against ground-fault leakage?
A. AFCI
B. GFCI
C. MCCB
D. Disconnect switch
Answer: B
Rationale: GFCI devices trip when they detect imbalance between hot
and neutral conductors, indicating ground-fault leakage.
5. The minimum number of lighting outlets required in a dwelling
unit living room is:
A. One
B. Two
C. Three
D. None required
Answer: A
Rationale: NEC requires at least one lighting outlet in habitable rooms
in dwelling units.
6. What is the purpose of an AFCI breaker?
A. Protect against overloads
B. Protect against arc faults
C. Protect against lightning
D. Provide grounding
Answer: B
Rationale: AFCIs detect dangerous arcing conditions that could lead to
electrical fires.
, 7. The color of equipment grounding conductors must be:
A. White
B. Green or bare
C. Black
D. Red
Answer: B
Rationale: Equipment grounding conductors must be green, green with
yellow stripe, or bare copper.
8. What is the typical frequency of electrical power in the United
States?
A. 50 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Answer: B
Rationale: The standard frequency in the U.S. electrical system is 60
Hz.
9. A continuous load is defined as a load operating at maximum
current for:
A. 30 minutes or more
B. 1 hour or more
C. 3 hours or more
D. 5 hours or more
Answer: C
Rationale: NEC defines continuous loads as those expected to run for
three hours or longer.
10. The main function of a circuit breaker is to:
A. Store energy
