South Carolina Electrician

South Carolina Electrician Exam: Complete 2026 Study Guide

You've put in the hours on the job. Now you need to prove it on paper. The South Carolina electrician exam stands between you and your commercial contractor license — and it covers a wide range of NEC code, electrical theory, and safety rules. This guide breaks down exactly what's on the SC electrical contractor exam, what to study, and how to pass it the first time.

Exam Overview: What to Expect

The South Carolina commercial electrician license test has 80 scored questions and a 300-minute (5-hour) time limit. A small number of unscored experimental questions may also appear; time for those is already built into the 5 hours, so you won't lose prep time to them.

To pass, you need to answer 56 out of 80 questions correctly — that's 70%.

This is an open-book exam. You can bring approved references into the testing room, including the 2020 NEC with SC modifications, NFPA 72 (2019), the American Electricians' Handbook (17th Edition), 29 CFR Part 1926 (OSHA), the Key Word Index, and the South Carolina 811 Excavator Manual. Books can be highlighted or underlined but must not contain any written notes or loose papers attached.

Exams are administered by PSI. Check the official exam bulletin for the latest scheduling and location details.

Topics Covered on the SC Electrician Exam

The exam pulls from 13 topic areas. Here's how they're weighted, ranked from heaviest to lightest:

• General Electrical Knowledge — 9 items: Ohm's law, AC/DC circuit theory, three-phase power, NEC definitions
• Service, Feeders, and Branch Circuits — 9 items: load calculations, GFCI/AFCI requirements, grounding of services
• Grounding and Bonding — 9 items: grounding electrode systems, bonding jumpers, separately derived systems
• Conductors and Cables — 9 items: ampacity, insulation types, NM cable installation, AWG sizing
• Raceways and Boxes — 9 items: conduit fill, box fill, securing/support, bend requirements
• Safety Information — 8 items: OSHA 1926 Subpart K, PPE, lockout/tagout, GFCI programs
• Electrical Power — 7 items: overcurrent protection, transformers, generators, service clearances
• Motors — 7 items: branch-circuit sizing, overload protection, disconnecting means, Table 430.52
• Lighting — 5 items: luminaire installation, recessed fixtures, support methods, grounding
• Special Occupancies and Equipment — 2 items: hazardous locations, health care facilities, pools
• Low Voltage — 2 items: Class 1/2/3 circuits, fire alarm wiring, separation requirements
• Illuminated Signs — 2 items: branch circuits, disconnecting means, grounding of sign equipment
• Fire Detection and Alarm Systems — 2 items: initiating devices, circuit pathway classes, smoke detector placement

The five heaviest topics — General Electrical Knowledge, Service/Feeders/Branch Circuits, Grounding and Bonding, Conductors and Cables, and Raceways and Boxes — each carry 9 exam items. That's 45 out of 80 questions right there. Start your study time there.

Sample Questions

Here are five representative questions from the SC electrician practice exam. Work through them — and no peeking at the answers. After you read these, take our free practice exam to test yourself.

Question 1 — Fire Detection and Alarm Systems (Hard)

You are a contractor installing a fire alarm system in a commercial building. The system interconnects two fire alarm control units located in separate rooms. The conductors between the two control unit enclosures are installed in conduit, and the total run is 15 ft. Is monitoring for integrity of these interconnecting conductors required?

• A) No, provided the enclosures are within 10 ft and conductors are in conduit
• B) Yes, unless the conductors use 2-hour fire-rated cable
• C) Yes, monitoring is always required between control unit enclosures
• D) No, provided the enclosures are within 20 ft and conductors are in conduit

Question 2 — Electrical Power (Medium)

In a balanced three-phase, delta-connected generator, each coil can carry 100 A. What is the maximum current available in each line conductor?

• A) 173 A
• B) 141 A
• C) 100 A
• D) 200 A

Question 3 — Fire Detection and Alarm Systems (Hard)

A contractor is designing an addressable fire alarm system for a four-story office building. A single fault occurs on a signaling line circuit (SLC) connected to addressable devices. What is the maximum extent of device loss permitted by the Code under this fault condition?

• A) Devices on the entire SLC loop
• B) Devices in no more than one zone
• C) Devices on no more than two floors
• D) No more than 50 addressable devices

Question 4 — General Electrical Knowledge (Medium)

You are sizing conductors for a feeder serving three DC motors drawing 20 A, 25 A, and 5 A respectively. The feeder has a resistance of 1.0 Ω per side. What is the total voltage drop in the feeder?

• A) 25 V
• B) 75 V
• C) 100 V
• D) 50 V

Question 5 — Safety Information (Medium)

On a construction project, first aid supplies must be checked by the employer before being sent out on each job and at what minimum frequency while on each job?

• A) Every two weeks
• B) At least monthly
• C) Daily
• D) At least weekly

Know the answers? Check yourself — take the free practice exam and find out.

What Types of Questions to Expect

Here's a breakdown of every topic area and the kinds of problems you'll face, along with how many practice questions we offer for each:

• General Electrical Knowledge (75 practice questions): Ohm's law calculations, impedance and power factor problems, three-phase versus single-phase power math, and NEC definition lookups.
• Service, Feeders, and Branch Circuits (73 practice questions): Load calculations with demand factors, GFCI/AFCI location rules by occupancy, service conductor clearances, and grounding of feeders.
• Grounding and Bonding (71 practice questions): Grounding electrode identification, equipment grounding conductor sizing, bonding jumper requirements, and separately derived system grounding.
• Conductors and Cables (76 practice questions): Ampacity tables, temperature correction and adjustment factors, insulation type selection (THHN, XHHW, RHW), NM cable support spacing.
• Raceways and Boxes (200+ practice questions): Conduit fill percentages from Chapter 9 Table 1 and Annex C, box fill calculations per Article 314, raceway securing distances, and bend-per-run limits.
• Special Occupancies and Equipment (38 practice questions): Hazardous location class/division/zone classification, sealing requirements, health care facility grounding, pool bonding and GFCI clearances.
• Electrical Power (120+ practice questions): Overcurrent device selection for conductors and equipment, transformer overcurrent protection, generator marking and ampacity, overhead and underground service clearances.
• Motors (68 practice questions): Branch-circuit conductor sizing at 125%, overload protection selection, Table 430.52 OCPD ratings, disconnecting means location and ratings.
• Low Voltage (13 practice questions): Class 1/2/3 circuit power source limits, CL2/CL3/PLTC cable applications, separation from power conductors, NPLFA vs. PLFA wiring requirements.
• Lighting (24 practice questions): Luminaire installation by location type (wet, damp, closet), recessed fixture clearances and IC vs. non-IC ratings, pole and suspended-ceiling mounting rules.
• Illuminated Signs (13 practice questions): Required branch circuit ratings for signs, disconnecting means placement, listing requirements, and grounding of sign enclosures.
• Fire Detection and Alarm Systems (22 practice questions): Initiating device types, heat detector spacing and temperature ratings, smoke detector placement concepts, and pathway class designations under NEC Article 760 and NFPA 72.
• Safety Information (52 practice questions): OSHA 1926 Subpart K hazard recognition, rubber insulating equipment classes, PPE selection and employer obligations, lockout/tagout procedures.

In total, we offer 850+ practice questions across all topic areas.

Study Materials

This is an open-book exam, so your references are your tools. Get them, mark them up, and know them cold.

Required references:

• NEC 2020 — The 2020 National Electrical Code is the backbone of this exam. Most of your questions come from it. Tab every chapter, highlight key tables (310.16, 430.52, Chapter 9), and know where to find Articles 100, 210, 230, 250, 310, 314, 430, and 700.
• American Electricians' Handbook — The 16th edition is a dense but practical reference. It covers theory and calculations that the NEC alone doesn't explain. Useful for electrical power and motor questions.
• OSHA 29 CFR 1926 — Eight exam items pull from safety rules. Subpart K (electrical) is your focus. Know the GFCI requirements, PPE classes, and lockout/tagout rules cold.

Optional but useful:

• Key Word Index by Tom Henry — If you're slow at finding things in the NEC, this index will save you significant time. It cross-references code terms in plain language. On a timed open-book exam, finding an answer in 30 seconds beats finding it in 3 minutes.

Study Tips for the SC Electrician Exam

Tab your books before test day. On an open-book exam, the winners aren't the smartest people in the room — they're the fastest at finding answers. Highlight and tab every required reference. Learn the index and table of contents until you can land on any topic in seconds. That speed is what separates a pass from a fail.

Work through every question once, then go back. Answer what you know, skip what you don't, and flag the skipped questions for a second pass. Don't sink more than two or three minutes into any single item. The clock is still running.

Give yourself three to six weeks. Use the official exam bulletin as your roadmap for what's tested. Focus on finding-it-fast skills over rote memorization. In practice, aim for 80% or higher on three consecutive runs — setting your bar above the 70% cut score gives you margin on test day.

Practice under timed conditions. Exam-clock anxiety is real. Run timed practice tests so the format feels routine by the time you sit for the real thing. Build your pacing now, not during the exam.

Frequently Asked Questions

How many questions are on the South Carolina Electrician exam and how long do I have?
The exam has 80 scored questions and a 5-hour (300-minute) time limit. A small number of unscored experimental questions may also be included, and the time for those has been built into the 5 hours.

What is the passing score?
You need 56 out of 80 correct — 70% — to pass.

How much does it cost to take the exam?
The registration fee is $75. Fees are non-refundable and non-transferable. Your registration is valid for one year.

How do I register?
You can register at the exam registration page online (available 24/7 — fastest option), by phone at (855) 340-3701, by fax at (702) 932-2666, or by mail using the form in the candidate bulletin.

How many times can I retake the exam if I fail?
Up to 2 times within a 12-month period. After that, once every 6 months. If you pass, you cannot retake the same exam.

Is the exam open book? What can I bring?
Yes. Approved references include the 2020 NEC with SC modifications, NFPA 72 (2019), the American Electricians' Handbook (17th Edition, 2021), 29 CFR Part 1926 (OSHA), the Key Word Index, and the South Carolina 811 Excavator Manual. Books can be highlighted or underlined — no written notes, no loose or attached papers.

Can I bring a calculator?
Yes, but it must be non-programmable, silent, battery-operated, with no paper tape printing and no alphabetic keyboard.

What ID do I need?
One valid, non-expired, government-issued photo ID. A state driver's license, state ID card, US passport, US military ID, US alien registration card, or Canadian government-issued ID all qualify. The name must match your registration exactly.

Do I need to pass another exam for my license?
Yes. All Electrician-Commercial Contractor candidates must pass both the Business Management and Law for Contractors Examination and the Electrician Examination. Alternatively, you can substitute the NASCLA Accredited Trade Examination for Electrical Contractors for the SC-specific electrician exam.

What experience do I need?
At least 2 years of commercial experience within the last 5 years in the electrician classification. You document this on an experience affidavit submitted with your license application after passing the required exams. Check the state licensing website for full application details.

Get Started: Take a Free Practice Exam

The South Carolina electrician exam is achievable. You know the work — now learn the format. Get your references tabbed, run timed practice sets, and aim for 80% before you schedule the real thing.

Start today: take our free practice exam to get a feel for the question style and where you stand. The free exam gives you 10 questions at no cost, no account required. When you're ready to go deeper, the full practice exam matches the real test — 80 questions, 300-minute timer, same topic breakdown — with a detailed score report by topic so you know exactly where to focus next.

You've done the hard work on the job. Put in the study time now and go pass this thing.