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Mississippi Residential Electrician Practice Exam

What This Practice Exam Covers

The Mississippi Residential Electrician licensing exam is 60 questions, timed at 180 minutes, with a passing score of 70% — that's 42 correct answers minimum. The exam covers 9 topic areas drawn from the NEC and related standards.

Two practice options are available here:

Free practice exam: 10 questions per attempt, pulled from a limited pool. You can retake it as many times as you want. It's a solid first look at the question style and format.

Full practice exam (paid): 60 questions, 180-minute clock — same structure as the real thing. Questions are drawn from a pool of 37+ items, so each attempt is unique. No duplicate exams. Every question ties directly to the official topic breakdown provided by the exam authority. If you're serious about passing, this is the tool to use.

Start with the free exam to get your bearings. Then use the full exam to find out where you actually stand.

What You'll Be Tested On

General Electrical Knowledge — 13 items

The heaviest single topic. Expect questions on GFCI protection by location (kitchens, bathrooms, garages, outdoors, crawl spaces), AFCI protection for dwelling unit branch circuits, and branch circuit conductor sizing rules. You need to know standard ampere ratings for fuses and inverse-time breakers cold — 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, and up. Grounding electrode types and bonding system requirements show up here too, along with branch circuit voltage limitations. This section rewards candidates who know the NEC fundamentals without looking anything up.

Services, Feeders, and Branch Circuits — 15 items

The largest topic by count. You'll work through service conductor clearances for overhead and underground installations, service disconnect location and rating rules, and the maximum number of service disconnects permitted. Feeder conductor sizing, demand factors, and load calculations all appear here. Per NEC, Section 220.5(B) covers rounding rules for load calculations — a detail that trips up candidates who eyeball numbers. Expect at least one calculation requiring you to size a service entrance conductor or determine feeder ampacity. Know NEC, Section 230.24(B)(2) for overhead service clearance and NEC, Section 230.70(A)(2) for disconnect location rules.

Overcurrent Protection — 5 items

Standard ampere ratings, conductor protection based on wire size and ampacity, and tap conductor rules. NEC, Section 240.4(D)(3) limits overcurrent protection for small conductors — know which wire sizes are capped at which ampere ratings. NEC, Section 240.24(E) covers locations where overcurrent devices cannot be installed. NEC, Section 240.13 addresses ground-fault protection of equipment. You'll also see questions on circuit breaker markings and arc energy reduction requirements.

Grounding and Bonding — 6 items

Grounding electrode types (concrete-encased, ground ring, rod, plate), grounding electrode conductor sizing, and equipment grounding conductor identification. Main bonding jumper requirements, bonding of metal piping systems and structural steel, and what constitutes an effective ground-fault current path. Don't confuse grounding with bonding — that distinction shows up directly in exam questions.

Conductors and Cables — 5 items

Ampacity tables and how to apply temperature correction factors and adjustment factors when more than three current-carrying conductors share a raceway. Per NEC, Section 310.15(C)(1)(b), adjustment factors apply based on conductor count — know the multipliers. Insulation designations (THHN, THWN, USE, etc.) and where each is permitted: dry, damp, wet locations, direct burial, or sunlight exposure. Parallel conductor requirements — same size, same length, same material, same insulation type, same termination. NEC, Section 310.12(A) covers conductor identification requirements for services and feeders.

Raceways and Boxes — 4 items

Conduit types and their permitted uses: EMT, IMC, RMC, FMC, LFMC, PVC, ENT, and others. Securing and support intervals matter — know the maximum distances from terminations and between supports for each type. Conduit fill calculations use percentage fill limits (40% for three or more conductors). Maximum four quarter-bends per conduit run. Box fill calculations based on conductor count, device count, and clamp count — know the cubic-inch volumes by wire size.

Lighting — 4 items

Luminaire placement in wet versus damp locations, bathtub and shower zone restrictions, and clothes closet clearance requirements. Recessed luminaires: know the difference between Type IC (insulation-contact rated) and non-IC, and thermal protection requirements. Weight limits for luminaires supported by outlet boxes. Track lighting: prohibited locations, load calculations, and grounding requirements.

Specialty — 4 items

Pools, spas, hot tubs, and fountains. GFCI protection requirements per NEC Handbook, Section 680.22(A)(1) and 680.22(A)(4). Equipotential bonding for permanently installed pools per NEC Handbook, Section 680.26(B) and 680.26(B)(2). Underwater luminaire wiring — wet-niche, dry-niche, and no-niche installations per NEC Handbook, Section 680.23(A)(5) and 680.23(B)(2)(b). Receptacle and switching device clearances from water, pool motor wiring methods, and disconnect requirements per NEC Handbook, Section 680.13 and 680.14. This section is narrow but detail-heavy.

Safety — 4 items

GFCI requirements and assured equipment grounding conductor programs, lockout/tagout procedures, personal protective equipment (rubber gloves, sleeves, blankets, head protection), working clearances around energized equipment, and guarding of live parts at 50 volts or more.

Worked Sample Questions

Question 1 — Services, Feeders, and Branch Circuits

You are wiring a new dwelling unit and need to determine the minimum number of 20-ampere branch circuits required for kitchen and dining area receptacle outlets. How many must be provided at minimum?

• A. Four
• B. Two
• C. One
• D. Three

Correct Answer: B — Two

The NEC requires a minimum of two 20-ampere small-appliance branch circuits serving all receptacle outlets in the kitchen, dining room, pantry, breakfast area, and similar spaces. One circuit is never enough, and three is not the minimum requirement. This is a straight code recall question — memorize the number.

Source: NEC, Section 210.11(C)(1); IRC Section E3703.2

Question 2 — Specialty (True/False)

Resistance-type heating elements in electric space-heating equipment shall be protected at not more than 48 amperes.

Correct Answer: FALSE

The protection limit is 60 amperes, not 48. Equipment rated over 48 amperes must have heating elements subdivided so that each subdivided load does not exceed 48 amperes. Candidates who confuse the two numbers — 48 and 60 — pick the wrong answer. The 48-ampere figure appears in the rule as the subdivision threshold, not the protection limit.

Source: NEC Handbook, Section 424.22(B)

How to Read Your Score

Passing requires 70% — 42 out of 60 questions correct.

Your first practice score is a diagnostic, not a verdict. If you score 75% or higher on the first full attempt, your fundamentals are in decent shape. Scoring between 70% and 75% means you're close but not safely above the line — one bad day and you fail. Scoring below 70% tells you exactly what you needed to know before sitting the real exam.

Use the topic breakdown after each attempt. If you're dropping points on Services, Feeders, and Branch Circuits — 15 items — that section alone can decide whether you pass. If Specialty is costing you, go back to the pool and spa rules specifically.

Don't average your scores across attempts and call it good. Your worst run is more predictive than your best. Aim for consistent 75%+ scores across multiple full attempts before you schedule the real exam.

Where Candidates Lose Points

Load calculations. The Services, Feeders, and Branch Circuits section is 25% of the exam and demands actual math. Candidates round incorrectly, skip demand factors, or misread NEC, Section 220.5(B) rounding rules. Write out every step.

Small conductor protection limits. NEC, Section 240.4(D)(3) sets hard caps on overcurrent protection for smaller wire sizes. Candidates who rely on general ampacity tables without applying the small-conductor rule choose breaker sizes that exceed the code limit.

Mixing up pool rules. The Specialty section requires precise recall of clearance distances and bonding requirements. NEC Handbook, Section 680.26(B) bonding requirements differ from general grounding rules — candidates apply the wrong rule.

Conductor adjustment factors. When more than three current-carrying conductors are bundled, ampacity must be derated per NEC, Section 310.15(C)(1)(b). Candidates skip this step entirely and oversize circuits on paper.

Time management. At 3 minutes per question, the 180-minute clock feels generous — until you hit a calculation-heavy run. Budget your time. Flag questions you're unsure of and come back. Don't burn 8 minutes on one load calculation and leave simpler questions unanswered.

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