Maryland Master Electrician Examination – Practice Questions and Correct Answers with Rationales | 2026/2027

Maryland Master Electrician Examination – Practice Questions and Correct Answers with Rationales | 2026/2027 Description: This comprehensive revision set contains 200 multiple-choice questions (MCQs) covering the Maryland Master Electrician Examination content areas, including NEC 2023 compliance, load calculations, grounding and bonding, wiring methods, motors and controls, services and feeders, special occupancies, safety, and Maryland-specific licensing requirements. Each question includes four answer choices, one correct answer marked with , and a rationale to reinforce understanding. Keywords: Maryland Master Electrician, Master Electrician Exam, NEC 2023, National Electrical Code, load calculations, grounding and bonding, wiring methods, motors, transformers, services, feeders, branch circuits, conduit fill, box fill, voltage drop, overcurrent protection, GFCI, AFCI, Maryland licensing, electrical safety, exam prep, practice questions, MCQs. 1. According to the NEC, what is the minimum working space depth in front of a 480V switchboard with exposed live parts on one side and grounded parts on the opposite side? A. 2 feet B. 3 feet C. 4 feet D. 5 feet Rationale: NEC Table 110.26(A)(1) requires 3 feet for 480V conditions with grounded parts opposite. 2. In Maryland, a Master Electrician license is issued by which authority? A. Maryland Department of Labor – Division of Occupational and Professional Licensing B. Maryland Public Service Commission C. Maryland State Board of Electrical Examiners D. Local county only Rationale: The Maryland Department of Labor oversees electrical licensing through its occupational licensing division. 3. What is the maximum allowable voltage drop for a branch circuit according to NEC recommendations? A. 1% B. 2% C. 3% D. 5% Rationale: NEC 210.19(A) Informational Note recommends 3% maximum voltage drop on branch circuits. 4. Which conductor is required to be white or gray? A. Equipment grounding conductor B. Grounded conductor C. Ungrounded conductor D. Traveler conductor Rationale: NEC 200.6 requires the grounded conductor to be white or gray. 5. What is the minimum size copper conductor permitted for a 100A service entrance? A. 8 AWG B. 6 AWG C. 4 AWG D. 2 AWG Rationale: NEC Table 310.16 requires 4 AWG copper for 100A at 75°C. 6. How many 12 AWG current-carrying conductors are allowed in a 1/2-inch EMT before derating is required? A. 3 B. 6 C. 9 D. 12 Rationale: NEC Table 310.15(C)(1) allows up to 9 conductors before applying adjustment factors. 7. A GFCI is required in which of the following locations? A. Bedroom receptacle B. Bathroom receptacle C. Living room receptacle D. Hallway receptacle Rationale: NEC 210.8(A) requires GFCI protection in bathrooms. 8. What is the standard ampere rating of a residential kitchen small-appliance branch circuit? A. 15A B. 20A C. 30A D. 40A Rationale: NEC 210.11(C)(1) requires 20A small-appliance branch circuits. 9. The minimum burial depth for rigid metal conduit under a driveway is: A. 6 inches B. 12 inches C. 18 inches D. 24 inches Rationale: NEC Table 300.5 requires 24 inches for RMC under a driveway. 10. What is the maximum overcurrent protection for a 14 AWG copper conductor? A. 10A B. 15A C. 20A D. 25A Rationale: NEC 240.4(D) limits 14 AWG copper to 15A. 11. Which article of the NEC covers grounding and bonding? A. Article 200 B. Article 250 C. Article 300 D. Article 400 Rationale: Article 250 covers grounding and bonding requirements. 12. A dwelling unit must have at least how many 20A small-appliance branch circuits? A. 1 B. 2 C. 3 D. 4 Rationale: NEC 210.11(C)(1) requires at least two small-appliance branch circuits. 13. What is the minimum cover for direct-buried UF cable? A. 6 inches B. 12 inches C. 18 inches D. 24 inches Rationale: NEC Table 300.5 requires 24 inches for direct-buried UF cable. 14. The NEC requires AFCI protection in which room? A. Garage B. Bedroom C. Bathroom D. Kitchen Rationale: NEC 210.12(A) requires AFCI protection in dwelling unit bedrooms. 15. What is the maximum number of disconnects allowed for a service? A. 4 B. 6 C. 8 D. 10 Rationale: NEC 230.71 allows up to six service disconnects. 16. The ampacity of a 1/0 THHN copper conductor at 75°C is: A. 120A B. 150A C. 175A D. 200A Rationale: NEC Table 310.16 lists 1/0 THHN copper at 150A for 75°C. 17. A motor with a nameplate FLA of 20A requires a branch-circuit conductor sized at least: A. 20A B. 25A C. 30A D. 40A Rationale: NEC 430.22 requires conductors at 125% of FLA: 20 × 1.25 = 25A.