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North Carolina Limited Electrical Contractor (L) — Practice Exam

What This Practice Exam Covers

The NC Limited Electrical Contractor (L) exam is 100 questions. You have 360 minutes to finish. Passing score is 70% — that's 70 correct answers.

This practice exam gives you two options.

Free practice exam: 10 questions per attempt, pulled from a limited question pool. You can retake it as many times as you want. It's a solid way to get a feel for question style and phrasing before you commit to anything.

Full practice exam (paid): 100 questions, 360-minute time limit — exactly like the real thing. Questions are drawn from a pool of 486+ items, so each attempt pulls a different set. You won't see the same exam twice. Every question maps to the official topic breakdown that PSI and the NC Electrical Contractors Licensing Board use to build the real test.

Start with the free exam. If you're serious about passing, move to the full version for real prep.

What You'll Be Tested On

The exam covers 11 topic areas. Here's what each one actually demands.

Laws, Rules, Basic Business Practices, and Practical Applications — 18 items
This is the single heaviest topic. Expect questions from the NC Electrical Contractors Licensing Law (NCGS Chapter 87, Article 4), the Board's administrative rules (21 NCAC 18B), and the NASCLA Contractors' Guide (NC Electrical Edition). You need to know license classifications under 87-43.3, fee and term requirements under 87-44, continuing education requirements under 87-44.1, and Board penalty procedures under 87-47. On the business side: contract types (lump-sum vs. cost-plus), bidding practices including bid peddling, markup calculations, labor burden, business structures (LLC, S corp, C corp, partnerships), bonding types, OSHA recordkeeping, ADA requirements, and bar chart scheduling. The NFPA 72 definitions tested here include alarm box types, detector classifications, ceiling surface definitions, and inspection frequencies.

Service Entrance and Equipment — 11 items
Heavy on NEC specifics. Know clearance requirements for service conductors over rooftops and walkways (NEC Handbook, Sections 230.24(A) and 230.24(B)(4)), mounting and support intervals for service-entrance cable (NEC Handbook, Section 230.51(B)), the maximum number of service disconnects (NEC Handbook, Section 230.71(A)), and requirements for emergency disconnects (NEC, Section 230.85). Ground-fault protection of equipment rules under NEC, Section 230.95 also appear here.

Load Calculations — 11 items
Arithmetic is unavoidable. You'll calculate dwelling unit loads using optional methods, feeder ampacity, branch circuit sizing, and dryer and cooking equipment demand factors (NEC, Sections 220.54 and 220.56). Know how to divide volt-amperes by voltage to get amperes, then select the next standard overcurrent device size from NEC, Section 240.6(A). Neutral load calculations under NEC, Section 220.61(B)(2) are also tested.

Bonding and Grounding — 10 items
Know which systems require grounding (NEC, Section 250.20), where the grounding electrode connection is made (NEC Handbook, Section 250.24(A)), electrode types and installation (NEC, Sections 250.52(A)(1), 250.52(A)(3), 250.52(A)(4)), grounding electrode conductor sizing (NEC, Section 250.66(A)), and equipment grounding conductor requirements. Conductor color coding rules (NEC Handbook, Sections 200.6(B) and 200.10(B)) show up here too.

Wiring Methods and Terminations — 10 items
Know permitted uses for wiring methods, conduit fill rules using NEC Chapter 9, Table 1 and Table 5, the 60% fill allowance for nipples (NEC Chapter 9, Notes to Tables — Note 4), EMT bending limits (NEC 358.26), and securing/support intervals (NEC, Section 358.30(A)). Protection from physical damage requirements (NEC, Section 300.4(A)(1)) are also tested. Ugly's Electrical References covers offset bend multipliers, 90° stub-up take-up, and 3-point saddle bends.

Boxes and Fittings — 8 items
Box fill calculations using NEC 314.16(B) and Table 314.16(B) are the core skill — count conductors, devices, clamps, and equipment grounding conductors correctly. Pull box and junction box sizing rules (NEC, Sections 314.28(A)(1) and 314.28(A)(2)) require you to apply the 8× and 6× conduit diameter rules for straight-through and angle pulls.

Overcurrent Protection — 9 items
Know where overcurrent protection must be placed in the circuit (NEC Handbook, Section 240.24(A)), tap conductor rules (NEC Handbook, Sections 240.21(B)(1) and 240.21(B)(2)), fuse classes and cartridge fuse requirements (NEC, Section 240.60(C)), and circuit breaker marking requirements (NEC 2020, Sections 240.83(C) and 240.86(C)). Conductor ampacity protection rules from NEC, Sections 240.4(B) and 240.4(D) appear frequently.

Appliances, Equipment, and Lighting — 7 items
Expect questions on dishwasher branch circuit sizing (NEC, Section 422.13), fixture installation in closets (NEC Handbook, Section 410.16(C)), transformer protection using NEC, Table 450.3(B), and space heating equipment rules (NEC 424.72(A)). Air conditioning equipment protection under NEC, Sections 440.22(A) and 440.32 is also fair game.

Motors and Control Wiring — 7 items
Motor branch circuit conductor sizing at 125% of FLC (NEC, Section 430.22), overload protection sizing (NEC, Section 430.32(A)(1)), short-circuit and ground-fault protection (NEC, Section 430.52(C)(1)), and disconnect requirements (NEC, Section 430.110(A)) are all tested. Use NEC, Section 430.6(A)(1) — full-load current comes from the NEC tables, not the nameplate, for most calculations.

Special Occupancies and Hazardous Locations — 6 items
Swimming pool wiring rules dominate this section: receptacle placement (NEC Handbook, Section 680.22(A)(1)), luminaire installation (NEC Handbook, Section 680.23(B)(2)(b)), and underwater lighting (NEC 2020, Section 680.51(B)). Mobile home park feeder requirements (NEC Handbook, Section 550.10(C)) also appear.

General — 3 items
Definitions from NEC Article 100 and basic installation workmanship requirements (NEC Handbook, Sections 110.12(A) and 110.12(C)). Short, but don't skip them — a missed definition is a free point handed away.

Worked Sample Questions

Question 1

Under a lump-sum contract, who assumes the risk for cost overruns due to unforeseen circumstances?

• A. The owner
• B. The architect
• C. The contractor
• D. The insurance company

Correct Answer: C — The contractor

In a lump-sum contract, you agree to finish the job for a set price before it starts. That means you carry all the financial risk. If material prices spike or hidden conditions add time, those costs come out of your margin, not the owner's pocket. The NASCLA Contractors Guide, Contract Management chapter — Lump-Sum Contract section makes this explicit: the contractor is responsible for any additional costs from unforeseen circumstances.

Question 2

On a commercial building you are running service-entrance cable that is not approved for mounting in contact with the building surface. How must this cable be supported, and what separation from the surface must be maintained?

• A. Insulating supports every 15 ft; 2 in. clearance
• B. Insulating supports every 30 in.; 2 in. clearance
• C. Straps every 10 ft; 1 in. clearance
• D. Insulating supports every 30 ft; 1/4 in. clearance

Correct Answer: A — Insulating supports every 15 ft; 2 in. clearance

NEC Handbook, Section 230.51(B) covers cable not approved for direct contact with the structure. The rule is insulating supports at intervals not exceeding 15 ft (4.5 m) and a minimum clearance of 2 in. (50 mm) from the surface. The 30 in. interval in NEC Handbook, Section 230.51(A) applies to cable that is approved for surface mounting — that's the distinction the question is testing.

Question 3

A dwelling load calculates to 46,200 VA at 240V. What is the minimum service rating?

• A. 150A
• B. 175A
• C. 200A
• D. 225A

Correct Answer: C — 200A

The math: 46,200 VA ÷ 240 V = 192.5 A. You can't install a 192.5 A service, so you move up to the next standard size from NEC 215.3, 240.6(A), 240.4(B). That's 200A. Never round down on service sizing — undersizing is a code violation.

How to Read Your Score

Passing is 70% — 70 out of 100 questions correct.

Your first practice score is a diagnostic, not a verdict. Most people score lower on the first attempt than they expect, because the question phrasing is specific to code language they haven't memorized yet. That's normal and useful.

Look at your score by topic, not just the total. If you're at 85% overall but only 50% on Load Calculations — which carries 11 items — that gap will hurt you on the real exam. Fix the weak topics before the strong ones.

A practice score in the low 70s means you're close but not safe. Exam day adds nerves, and questions on the real test may come from parts of the topic pool you haven't seen yet. Aim for consistent scores in the low 80s before you book your seat.

Use every wrong answer as a lookup exercise. Find the exact code section or statute behind it. That process — wrong answer, then manual lookup — builds the retrieval habit you need under pressure.

Where Candidates Lose Points

Not reading the full question stem. Service entrance questions often hinge on one word: "not approved for surface mounting" versus "approved for surface mounting." Miss that and you'll choose the wrong support interval every time.

Using nameplate amps instead of table values for motors. NEC, Section 430.6(A)(1) is clear — use the table full-load current, not the nameplate, for conductor and overload sizing. This mistake shows up repeatedly in the Motors and Control Wiring section.

Box fill errors. Candidates forget to count equipment grounding conductors as one conductor regardless of how many are in the box (NEC Chapter 9, Notes to Tables — Note 3), or they miscount device yokes. Box fill is 8 questions — errors here are expensive.

Conduit fill with mixed conductor sizes. When conductors aren't all the same size, you must look up each conductor's cross-sectional area from NEC Chapter 9, Table 5 individually, then compare the total to the conduit's allowable fill from NEC Chapter 9, Table 1. Candidates who skip Table 5 and estimate get this wrong.

Running short on time. With 100 questions and 360 minutes, you have 3.6 minutes per question. Multi-step load calculations and conduit fill problems can eat 5–7 minutes if you're slow. Flag them, move on, come back.

Laws questions answered from memory, not from the statute. The NC-specific licensing rules (NCGS Chapter 87, Article 4 and 21 NCAC 18B) are precise about numbers: waiting periods, fee amounts, CE hours. Guessing from general knowledge costs points.

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