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What This Practice Exam Covers

The Maryland Master Electrician exam is 90 questions, 240 minutes, passing score 70%. That means you need at least 63 correct answers.

Two ways to practice here:

Free practice exam — 10 questions per attempt, drawn from a limited pool. Retake it as many times as you want. Good for getting a feel for question style and format before you commit to serious prep.

Full practice exam — 90 questions, 240-minute time limit, mirrors the real thing exactly. Questions are pulled from a pool of 467+ items, so every attempt gives you a different mix. No two exams are identical. Questions are built from the same topic blueprint the official test provider uses.

Start with the free exam. If you're serious about passing, move to the full exam — you need volume and variety to be ready.

What You'll Be Tested On

Calculations — 30 items (33% of the exam)

This is the heaviest section. One-third of your score lives here. You must be able to work through:

• Branch-circuit and feeder load calculations for dwelling units using both the standard method and the optional method. Know NEC, Section 220.82(B) and 220.82(C)(3), (C)(4), and (C)(5) for optional method dwelling loads. Know NEC, Section 220.52(A) for small-appliance and laundry circuits.
• Service load calculations for multifamily occupancies using NEC Table 220.84 and the optional calculation at NEC, Section 220.83(A) and 220.83(B). Commercial demand factor work also appears here.
• Motor circuit conductor sizing — single motor, multiple motors, and combination loads. NEC, Section 430.22 and 430.24 are heavily tested. You'll size conductors using full-load current from NEC, Section 430.6(A)(1), not nameplate amps.
• Motor branch-circuit short-circuit and ground-fault protection using NEC, Table 430.52 and the exceptions at NEC, Section 430.52(C)(1) Exception No. 1 and Exception No. 2.
• Motor overload protection sizing per NEC, Section 430.32(A)(1), (A)(2), and 430.32(C). Know the trip current percentages cold.
• Conductor ampacity correction and adjustment factors — ambient temperature correction and bundling adjustment. NEC, Section 310.15(B)(2) governs adjustment factors for more than three current-carrying conductors.

Bring a calculator. Work every step. A single missed multiplier costs you the question.

Wiring and Protection — 14 items

NEC-based questions across overcurrent protection, conductor protection, and service equipment. Expect questions on standard overcurrent device ratings from NEC, Section 240.6(A), next-size-up rules at NEC, Section 240.4(B), and feeder protection under NEC, Section 215.3. Available fault current marking requirements from NEC, Section 110.24(A) and 110.24(B) appear in this section.

Wiring Methods and Materials — 13 items

Covers permitted wiring methods, installation requirements, and physical protection rules. Know pull and junction box sizing per NEC, Section 314.28(A)(1) and 314.28(A)(2). Understand wiring in ducts and plenums under NEC Handbook, Section 300.22(B) and 300.22(C)(1). Protection through wood members is governed by NEC Handbook, Section 300.4(A)(1). Aboveground methods for over 1000 volts fall under NEC Handbook, Section 300.37.

Electrical Theory — 10 items

Definitions, Ohm's Law, AC theory, troubleshooting, and instruments. Questions come straight from Article 100 definitions — know the exact NEC Handbook definitions for terms like separately derived system, ground fault, overload, selective coordination, interrupting rating, voltage to ground, and neutral point. Metric prefixes, resistance principles, and conductor conductivity show up here too.

Special Occupancies — 8 items

Class I hazardous locations dominate. Know Division classifications under NEC Handbook, Section 500.5(B)(2) and 500.5(C)(1). Wiring methods for Class I, Division 1 and Division 2 are tested — see NEC, Section 501.10(A)(2)(3) and NEC Handbook, Section 501.10(B)(1)(6). Sealing requirements under NEC Handbook, Section 501.15(A)(1) and 501.15(B)(2) are specific and commonly tested.

Equipment for General Use — 9 items

Motor controllers, switches, panelboards, appliances, and luminaires. NEC, Section 430.83(C)(1) for motor controller ratings, NEC, Section 404.8(A) for switch accessibility, and NEC, Section 422.11(E) for appliance overcurrent protection all appear. Know the difference between a switchboard, panelboard, and switchgear per Article 100 definitions.

Special Equipment — 4 items

Signs and outline lighting (Article 600) and cranes and hoists (Article 610) appear here. NEC, Section 600.23(D), 600.23(E), and 600.32(A)(4) and (A)(5) are cited references. NEC Handbook, Section 610.33 and 610.57 cover cranes.

Special Communications — 2 items

Two questions, minimal weight. Know the basics of emergency systems under NEC Handbook, Section 700.10(D)(2) and 700.12(C), and legally required standby per NEC Handbook, Section 701.12.

Worked Sample Questions

Question 1

When modifications to the electrical installation occur that affect the available fault current at the service, what action is required regarding the service equipment?

• A. The building owner must notify all tenants of the change in available fault current
• B. The service equipment must be replaced with equipment rated for the new fault current
• C. A new arc-flash study must be submitted to the utility company
• D. The available fault current shall be verified or recalculated and the field marking adjusted to reflect the new level

Correct Answer: D

NEC, Section 110.24(B) is direct: when modifications affect available fault current at the service, you verify or recalculate it, and you update the field marking. The code does not require equipment replacement as a default, does not require tenant notification, and does not require an arc-flash study submission to the utility. The marking requirement is what makes this a code-compliance question, not an engineering judgment question.

Question 2

Which of the following aboveground wiring methods is permitted for circuits rated over 1000 volts nominal?

• A. Nonmetallic-sheathed cable (Type NM)
• B. Electrical nonmetallic tubing (ENT)
• C. Underground feeder cable (Type UF)
• D. Electrical metallic tubing (EMT)

Correct Answer: D

Per NEC Handbook, Section 300.37, aboveground conductors over 1000 volts must be installed in rigid metal conduit, intermediate metal conduit, EMT, rigid thermosetting or thermoplastic conduit, cable trays, auxiliary gutters, busways, cablebus, or other identified raceways, or as exposed runs of listed metal-clad cable. NM cable, ENT, and UF cable are not on that list. EMT is — and that's the answer.

How to Read Your Score

70% is the line. On a 90-question exam, that's 63 correct.

Your first practice score is a diagnostic, not a verdict. Most candidates score lower on attempt one than they expect. That's useful — it shows you where the gaps are before they cost you on the real exam.

Look at your results by topic, not just your total. A 75% overall score that hides a 40% on Calculations is a problem — Calculations is 33% of the exam. A weak topic at that weight can pull your total below the line even if everything else is solid.

Scoring between 70% and 78% on practice usually means you're close but not there yet. The real exam will have questions you haven't seen. Build a buffer. Aim for consistent 80%+ on full practice attempts before you sit.

Use each attempt to identify which NEC sections you're guessing on. Then go look them up. Targeted review beats re-reading chapters you already know.

Where Candidates Lose Points

The Calculations section is where most people fail. Thirty questions, 33% of the score. Common mistakes:

• Using nameplate amperes instead of NEC table full-load current for motor calculations. NEC, Section 430.6(A)(1) requires table values. Using the nameplate gets you the wrong answer every time.
• Skipping the demand factor step on dwelling or multifamily service calculations. NEC Table 220.84 and the optional method rules have specific demand percentages — apply them.
• Misapplying conductor ampacity adjustment factors. Forgetting to apply both a temperature correction and a bundling adjustment when both conditions exist is a common error.
• Picking the wrong standard overcurrent device size — know NEC, Section 240.6(A) ratings by memory, and know when next-size-up under NEC, Section 240.4(B) applies and when it doesn't.

On code questions:

• Mixing up hazardous location Division 1 and Division 2 wiring method requirements. They're different. Know which methods are restricted to which division.
• Confusing Article 100 definitions. Overload, overcurrent, ground fault, and fault current have distinct definitions. Questions hinge on the exact language.

On time: 240 minutes for 90 questions is 2 minutes 40 seconds per question. The calculation problems eat more time. Don't let theory questions bleed into your calculation budget.

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