MARYLAND MASTER ELECTRICIAN EXAM PREP 2026: Practice Questions, Verified Answers & Detailed Rationales - Pass the NEC Exam with Confidence

MARYLAND MASTER ELECTRICIAN
EXAM PREP 2026: Practice Questions,
Verified Answers & Detailed
Rationales - Pass the NEC Exam with
Confidence


1. Which of the following is the primary purpose of bonding metal
raceways and enclosures in an electrical system?

 A. To increase conductor ampacity
 B. To provide a low-impedance fault current path
 C. To reduce voltage drop during normal operation
 D. To improve power factor in branch circuits

Answer: B. To provide a low-impedance fault current path

Rationale: Bonding ensures that conductive metal parts are electrically
connected together to create an effective ground-fault current path. This
allows overcurrent protective devices to operate quickly during a fault
condition, reducing shock and fire hazards .

2. According to the NEC, what is the minimum working clearance in
front of a 208-volt panelboard under Condition 2 (exposed live parts
on one side, grounded parts on the other)?

,  A. 2 feet
 B. 2.5 feet
 C. 3 feet
 D. 4 feet

Answer: C. 3 feet

Rationale: NEC Table 110.26(A)(1) requires a minimum working clearance
of 3 feet for equipment operating at 151 to 600 volts to ground under
Condition 2 .

3. What is the maximum continuous load permitted on a branch circuit
protected by a 20-amp overcurrent device?

 A. 12 amperes
 B. 15 amperes
 C. 16 amperes
 D. 20 amperes

Answer: C. 16 amperes

Rationale: Continuous loads are limited to 80% of the circuit rating unless
the overcurrent device and assembly are listed for 100% operation. 80% of
20 amperes equals 16 amperes .

4. Which NEC article primarily governs grounding and bonding
requirements?

 A. Article 110
 B. Article 210
 C. Article 250
 D. Article 300

Answer: C. Article 250

,Rationale: Article 250 contains the comprehensive requirements for
grounding and bonding of electrical systems, equipment, and enclosures .

5. What is the minimum burial depth for residential branch circuits
rated 120 volts or less with GFCI protection and maximum overcurrent
protection of 20 amperes using direct burial cable?

 A. 6 inches
 B. 12 inches
 C. 18 inches
 D. 24 inches

Answer: B. 12 inches

Rationale: NEC Table 300.5 permits residential branch circuits meeting
these conditions to be buried at a minimum depth of 12 inches when using
direct burial cable .

6. In a three-phase, four-wire wye system, the voltage measured from
any phase conductor to neutral is called:

 A. Line voltage
 B. Induced voltage
 C. Phase voltage
 D. Potential difference factor

Answer: C. Phase voltage

Rationale: Phase voltage is measured between a phase conductor and the
neutral conductor in a wye-connected system .

7. What is the purpose of a grounding electrode conductor?

 A. To carry neutral current continuously

,  B. To connect equipment grounding conductors together
 C. To connect the grounded service conductor to the grounding
electrode system
 D. To increase transformer efficiency

Answer: C. To connect the grounded service conductor to the
grounding electrode system

Rationale: The grounding electrode conductor establishes the connection
between the electrical service and the grounding electrode system, helping
stabilize voltage to earth during abnormal conditions .

8. A conductor with insulation rated THHN is primarily suitable for:

 A. Wet locations only
 B. Dry and damp locations
 C. Hazardous classified locations only
 D. Underground direct burial only

Answer: B. Dry and damp locations

Rationale: THHN conductors are thermoplastic high-heat-resistant nylon-
coated conductors generally suitable for dry and damp locations .

9. What device is intended to protect people against electric shock by
opening a circuit when a small imbalance in current occurs?

 A. AFCI
 B. Thermal overload relay
 C. Ground-fault circuit interrupter (GFCI)
 D. Surge protector

Answer: C. Ground-fault circuit interrupter (GFCI)