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South Carolina Electrician Licensing Exam — Practice Test Guide

What This Practice Exam Covers

The South Carolina Electrician licensing exam consists of 80 questions answered within 300 minutes (5 hours). The passing score is 70%, meaning you must answer at least 56 questions correctly.

This practice test gives you two options:

Free practice exam: Each attempt draws 10 questions from a limited pool. You can retake it as many times as you like — it's a solid way to get a feel for question style, phrasing, and difficulty before committing to serious prep.

Full practice exam (paid): Mirrors the real exam exactly — 80 questions, 300-minute time limit. Questions are drawn from a pool of 799+ items, so every attempt produces a unique exam with no repeated sets. Topics are weighted to match the official exam blueprint provided by the licensing authority. This is the tool to use when you're actually preparing to pass.

Start with the free exam to orient yourself, then move to the full exam for structured practice.

What You'll Be Tested On

The exam covers 13 topic areas. Here's what each one actually demands.

General Electrical Knowledge (9 items)
Expect Ohm's law and DC circuit calculations — you'll solve for voltage, current, resistance, and power. AC theory questions test impedance, reactance, and power factor. You'll need to recognize electrical units, handle metric prefixes (kilo = 1,000; milli = 1/1000), convert horsepower to watts (1 hp = 746 W), and apply three-phase and single-phase power relationships. NEC definitions from Article 100 are also tested here — know terms like "continuous load," "overload," and "demand factor" precisely.

Service, Feeders, and Branch Circuits (9 items)
Questions target branch-circuit ratings and voltage limitations, GFCI and AFCI protection requirements by location, and service conductor clearances. Load calculation questions require you to apply demand factors correctly. Grounding and bonding of services and feeders appears here, as does overcurrent protection — including the 125% rule for continuous loads (NEC 2020, Article 100, Definitions, Part I — Continuous Load).

Grounding and Bonding (9 items)
One of the heavier topics. You must know the grounding electrode system — which electrodes qualify under NEC 2020, Section 250.50 and Section 250.52(A) — and the sizing rules for grounding electrode conductors. Equipment grounding conductors, main bonding jumpers, system bonding jumpers, and separately derived systems all appear. NEC 2020, Section 250.53(A)(2) Exception and Section 250.66(B) are cited in the question bank.

Conductors and Cables (9 items)
Know insulation types — THHN, THWN, RHW, XHHW — their temperature ratings, and where each is permitted. Ampacity adjustment factors for ambient temperature and bundling are tested using NEC Table 310.16 and NEC Table 310.15(C)(1). Cable-type rules for NM, NMC, MC, and AC cable cover permitted uses, installation, and support intervals — NEC 2020, Section 334.30 and Section 330.30(B) are in the question bank.

Raceways and Boxes (9 items)
Conduit fill calculations use NEC Chapter 9, Table 1 (percent fill), Table 4 (EMT dimensions), and Table 5 (conductor dimensions). Note 4 (nipples, 60%) and Note 7 (0.8 rounding rule) have both appeared. Box fill calculations apply NEC 314.16(B). Pull box sizing for conductors 4 AWG and larger uses NEC 314.28(A)(1) for straight pulls (8× the largest raceway) and NEC 314.28(A)(2) for angle pulls (6× the largest plus the sum of the others). Bend limits and support spacing — including NEC 358.26 and NEC 358.30 for EMT — round out this section. Saddle bends, offsets, and stub-ups from Ugly's Electrical References also appear.

Special Occupancies and Equipment (2 items)
Hazardous location classification — Class I, II, and III Divisions and Zones — and wiring methods in those locations. Sealing requirements, health care facility wiring, swimming pool bonding, and commercial garage requirements (NEC 511.3(E)(1), 511.4(B)(1)) are all fair game.

Electrical Power (7 items)
Overcurrent protection devices, transformer installation and protection rules (NEC 450.21(B)), generator ratings and conductor ampacity (NEC 445.18(C)), and service conductor clearances. Emergency, legally required standby, and optional standby systems are also covered.

Motors (7 items)
Motor branch-circuit conductor sizing at 125% of FLC (NEC 430.22(A)), overload protection selection, short-circuit protective device ratings from NEC Table 430.52, disconnecting means requirements, and nameplate markings including locked-rotor code letters. Multiple-motor circuits appear under NEC 430.24.

Low Voltage (2 items)
Class 1, 2, and 3 circuit classifications, power source requirements, cable types (CL2, CL3, PLTC), and separation rules. NEC 725.135(C), 725.135(D), and 725.136(D)(1) are cited in the question bank.

Lighting (5 items)
Luminaire installation by location — wet, damp, closets, bathrooms — mounting methods, grounding requirements, and recessed luminaire clearances including Type IC versus non-IC ratings (NEC 410.116(A)(1)). Lampholders and low-voltage lighting systems also appear.

Illuminated Signs (2 items)
Branch-circuit requirements, disconnecting means location, grounding of signs, and neon secondary-circuit wiring rules. NEC 600.32(A)(3), 600.32(A)(4), and 600.32(J)(1) are cited.

Fire Detection and Alarm Systems (2 items)
Heat detector classifications and spacing, smoke detector placement, notification appliance requirements, and fire alarm circuit pathway class designations. Power-limited versus non-power-limited circuit distinctions are tested.

Safety Information (8 items)
OSHA 29 CFR 1926 rules — electrical hazard recognition, GFCI programs, PPE requirements, rubber insulating glove classes, lockout/tagout procedures (29 CFR 1926, §1926.417(b)), and confined space atmospheric testing. Employer payment obligations for PPE also appear.

Worked Sample Questions

Question 1 — General Electrical Knowledge

What is the minimum headroom required above service equipment?

• A. 5 ft
• B. 6 ft
• C. 6 ft 6 in
• D. 7 ft

Correct Answer: C — 6 ft 6 in

NEC 2020, Section 110.26(E) sets the minimum headroom at 6 feet 6 inches for service equipment, switchboards, panelboards, and motor control centers. Candidates frequently choose 6 ft because that figure appears elsewhere in working-space rules — but headroom is its own requirement and the number is specific. Read the question carefully: "headroom" and "working space depth" are not the same thing.

Question 2 — Service, Feeders, and Branch Circuits

A panelboard has a continuous load of 80A. What is the minimum OCPD size?

• A. 80A
• B. 90A
• C. 100A
• D. 110A

Correct Answer: C — 100A

A continuous load must be protected at 125% of its value: 80A × 1.25 = 100A. Under NEC 2020, Article 100 (Definitions, Part I — Continuous Load), a load expected to continue for 3 hours or more is continuous. The OCPD must not be less than 100A, and 100A is a standard rating under NEC 240.6(A). Answer B (90A) is not a standard rating and would be undersized. Answer D adds an unnecessary extra step.

Question 3 — Grounding and Bonding

An equipotential bonding grid is required around outdoor pools extending how far from the pool edge?

• A. 18 inches
• B. 24 inches
• C. 36 inches
• D. 48 inches

Correct Answer: C — 36 inches

NEC 680.26(B)(2) requires the equipotential bonding grid for perimeter surfaces to extend 3 feet (36 inches) horizontally beyond the inside walls of the pool. The 18-inch figure is a common distractor associated with other pool clearance rules. Knowing the exact distance matters — this is a one-number question with no calculation involved, so there's no partial credit for being close.

How to Read Your Score

The passing score is 70% — 56 correct out of 80. On a first practice attempt, treat your score as a diagnostic, not a verdict. Most candidates are weak in at least two or three topic areas on their first run, and a single attempt doesn't tell you where your knowledge is solid versus where you got lucky.

Look at your score by topic. If you're below 70% in Grounding and Bonding, Raceways and Boxes, or Motors — each worth 7–9 items — those gaps have an outsized effect on your total score. Prioritize the heaviest-weighted sections first.

Scoring in the low 70s on practice usually means the real exam is borderline. Aim for 80%+ consistently across multiple full 80-question attempts before scheduling. Because the full practice exam draws from 799+ questions, each retake tests a different cross-section of your knowledge. Use that to confirm your strengths are real, not a product of seeing the same questions twice.

Where Candidates Lose Points

Skipping steps in multi-step calculations. Motor and load calculation questions require a specific sequence — find FLC from a table, apply the correct percentage, then round to a standard size. Stopping one step early is the most common error in Motors and Service, Feeders, and Branch Circuits.

Mixing up similar numbers. Headroom (6 ft 6 in), working clearance depths, and conductor clearance distances are all distinct values from distinct code sections. Candidates who memorize a single number for "clearance" get burned.

Conduit fill rounding errors. Note 7 of NEC Chapter 9 requires rounding up when the calculation result is 0.8 or more of a whole conductor — ignoring this produces the wrong fill count.

Wrong table for the job. Using NEC Table 310.16 without applying correction factors from NEC Table 310.15(C)(1) for ambient temperature is a frequent mistake in the Conductors and Cables section.

Misidentifying GFCI and AFCI requirements. The locations that require GFCI protection versus AFCI protection — and which require both — shift with each NEC edition. Know the specific locations cited in NEC 210.8(A)(6) and related sections cold.

Running out of time. With 80 questions and 300 minutes, you have 3 minutes 45 seconds per question — generous, but calculation-heavy topics like Raceways and Boxes and Motors can stall candidates who haven't practiced the math under time pressure.

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