- Exam Snapshot: The Numbers You Must Memorize
- Domain Breakdown by Question Count
- Open-Book References and What You Can Bring
- Fees, Eligibility, and the One-Year Clock
- Don't Forget the Business Management and Law Exam
- Licensing Thresholds, Bonding, and Renewal
- Final-Week Review Priorities
- Frequently Asked Questions
- The trade exam has 60 scored questions, 180 minutes, and requires 44 correct (73.3%) to pass.
- Services, Feeders, and Branch Circuits (Domain 2) carries 15 questions - the single largest domain.
- General Electrical Knowledge (Domain 1) is second at 13 questions; together they're nearly half the exam.
- The PSI fee per exam portion is $75; state application, initial licensure, and renewal fees are separate.
Exam Snapshot: The Numbers You Must Memorize
Before you touch a single practice question, lock these figures into memory. The South Carolina Residential Specialty Contractor Electrical Exam (SC-RSC-EL) - administered through PSI Services LLC on behalf of the South Carolina Residential Builders Commission - is a 60-question, scored, multiple-choice trade exam with a 180-minute time limit. To pass, you need 44 correct answers, which works out to 73.3%. PSI may also slip in 5 to 10 unscored pretest questions, but the time you spend on those doesn't count against your 180-minute clock, so don't waste energy trying to guess which questions are "real."
This exam leads to the official license classification of Residential Electrician (RBE), one of several licensed residential specialty contractor categories in South Carolina. If you've seen other study sites describe a different question count, different fee, or different governing body under the same acronym, they're not describing this credential - this page sticks strictly to the PSI state-specific Residential Electrical trade exam, not the NASCLA alternative electrical exam and not any commercial credential.
For a deeper walkthrough of how this fits together conceptually, see the SC-RSC-EL Study Guide 2026, and if you're still mapping out whether this exam matches your career plans, start with What Is SC-RSC-EL?
Domain Breakdown by Question Count
The trade exam is built from nine domains, and the official question allocations are fixed. Memorizing these weights tells you exactly where to spend your study hours - and where not to overinvest.
| Domain | Topic | Questions |
|---|---|---|
| 1 | General Electrical Knowledge | 13 |
| 2 | Services, Feeders, and Branch Circuits | 15 |
| 3 | Overcurrent Protection | 5 |
| 4 | Grounding and Bonding | 6 |
| 5 | Conductors and Cables | 5 |
| 6 | Raceways and Boxes | 4 |
| 7 | Lighting | 4 |
| 8 | Specialty (pool/spa, garages, generators, wheelchair lifts) | 4 |
| 9 | Safety | 4 |
Domains 2 and 1 combined account for 28 of the 60 scored questions - nearly half the exam. That means Services, Feeders, and Branch Circuits deserves the most repetitions in your practice sessions, followed closely by general electrical fundamentals like theory, terminology, and code organization. For a full domain-by-domain walkthrough with sample topic lists, see the SC-RSC-EL Exam Domains 2026 guide.
Domain 2: Services, Feeders, and Branch Circuits
This is the highest-weighted domain at 15 questions, so treat it as your anchor topic.
- Service entrance sizing, disconnects, and grounding-electrode conductor requirements
- Feeder and branch-circuit conductor sizing and load calculations
- Load calculation methods for dwelling units under the 2017 NEC
Domain 1: General Electrical Knowledge
Second-largest at 13 questions, this domain tests broad code literacy and electrical fundamentals rather than one narrow topic.
- Ohm's Law, power formulas, and basic circuit theory
- NEC Article numbering, definitions, and how to navigate the code quickly under time pressure
- General permitting and inspection concepts tied to residential work
The smaller domains - Overcurrent Protection, Conductors and Cables, Raceways and Boxes, Lighting, Specialty, and Safety - each carry 4 to 6 questions. Don't skip them; a candidate who ignores six domains worth 27 combined questions to over-prepare on the top two is taking on unnecessary risk. If you're unsure how the exam's difficulty compares across domains, How Hard Is the SC-RSC-EL Exam? breaks that down further.
Open-Book References and What You Can Bring
Unlike closed-book licensing exams in other trades, the SC-RSC-EL trade exam is open-book. Knowing exactly which references are listed - and preparing them correctly - is a study strategy in itself.
- 2017 National Electrical Code or the NEC Handbook
- 2018 International Residential Code, or the South Carolina IRC, or the IRC Commentary
- Ugly's Electrical References (2017 edition)
- OSHA 29 CFR Part 1926
These are the code editions tied specifically to the state-specific PSI exam. If you've researched the NASCLA alternative electrical exam elsewhere, note that it uses a different reference list - don't mix the two when you're building your exam-day binder.
Because this is open-book, raw knowledge memorization matters less than speed of navigation. With 180 minutes for 60 questions, you have roughly three minutes per question - but that average hides the fact that some questions require you to look up a table or formula. Practicing with a tabbed copy of the 2017 NEC until you can find load-calculation tables and grounding-electrode requirements in under 30 seconds is one of the highest-leverage things you can do.
Fees, Eligibility, and the One-Year Clock
Budgeting for this license involves more than the exam fee itself. Here's how the costs break down:
| Item | Cost |
|---|---|
| PSI fee, one examination portion | $75 |
| State application fee | $135 |
| Initial licensure fee | $220 |
| Renewal fee | $220 |
For a complete cost picture including both the trade exam and business-law portions, see the SC-RSC-EL Certification Cost 2026 breakdown.
Before you can even schedule with PSI, the Commission has to approve your application. That approval package includes at least one year of relevant supervised experience, an affidavit signed by a qualifying licensed builder, general contractor, or electrician, supporting work-history documents, a credit report, and lawful-presence verification. Only after Commission approval can you book your PSI seat. Full detail on assembling this packet lives in SC-RSC-EL Requirements 2026.
Key Takeaway
Both the trade exam and the business-law exam must be passed within your one-year eligibility window. You get three total attempts; after a third failure, you must wait 12 months from your last attempt before trying again. Don't burn attempts on a portion you haven't actually studied for.
Don't Forget the Business Management and Law Exam
The Residential Electrician license requires passing two separate exams, and it's easy for candidates fixated on wiring diagrams to underweight the second one. The Business Management and Law for Residential Builders examination has 50 questions, a 120-minute limit, and requires 34 correct answers (68%) to pass. It draws from the NASCLA South Carolina Residential Builders guide, eighth edition - a completely different reference from your trade-exam code books.
Because this exam covers business, contract, and legal topics rather than electrical theory, it rewards a different kind of preparation. Treat it as its own study track with its own reference book, its own tabbing system, and its own practice questions - don't try to cram it in the same session as your NEC review.
Licensing Thresholds, Bonding, and Renewal
Once licensed, a few operational rules matter for day-to-day compliance:
- Any covered residential specialty contracting job exceeding $500 requires the appropriate license - this isn't a "small jobs exempt" threshold you can rely on for casual side work.
- A surety bond of at least $10,000 is required for covered undertakings exceeding $5,000 in combined labor and materials. Remember: the $10,000 figure is the coverage amount the bond provides, not what you pay to purchase it.
- Licenses renew biennially by June 30 of odd-numbered years, and required bond coverage must be maintained continuously - letting your bond lapse can jeopardize your active license status.
If you're weighing whether pursuing this license is worth the time and cost against the work opportunities it opens up, Is the SC-RSC-EL Certification Worth It? walks through that calculation, and SC-RSC-EL Jobs covers the kinds of residential electrical work this license qualifies you to bid and perform.
Final-Week Review Priorities
In your last week before test day, resist the urge to re-read every reference cover-to-cover. Instead, triage by domain weight and by how open-book-friendly each topic is.
High-weight domains
- Drill Services, Feeders, and Branch Circuits load calculations until they're fast, not just correct
- Re-tab any NEC sections you kept fumbling to find during practice tests
Mid and low-weight domains
- Run timed sets covering Overcurrent Protection, Grounding and Bonding, and Conductors and Cables
- Review Specialty topics (pools/spas, garages, generators, wheelchair lifts) since they're easy to overlook at only 4 questions
Logistics and light review
- Confirm your PSI appointment, ID requirements, and calculator model
- Skim your tabbed code books rather than reading dense sections cold
This sequencing works because it mirrors the exam's actual weighting - described in more detail on the SC-RSC-EL Exam Domains 2026 guide - rather than treating all nine domains as equally important. For a broader run-through of pacing strategy across a longer prep window, the SC-RSC-EL Study Guide 2026 lays out a full multi-week plan. And once you feel ready, running full-length timed simulations on our practice test platform is the closest thing to a dry run of the real PSI session.
Frequently Asked Questions
The trade exam has 60 scored multiple-choice questions with a 180-minute time limit. PSI may add 5-10 unscored pretest questions, but time spent on those doesn't count against your limit.
You need 44 correct answers out of 60, which is 73.3%. The separate Business Management and Law exam requires 34 out of 50 (68%).
Services, Feeders, and Branch Circuits (Domain 2) is the largest at 15 questions, followed by General Electrical Knowledge (Domain 1) at 13.
No. The exam is open-book for listed references, and you may highlight, underline, and use permanent tabs. Handwritten notes, removable tabs, and loose or attached papers are prohibited.
You're allowed three total attempts. After a third failure, you must wait 12 months from your last examination attempt before you can test again, and you must still pass within your overall one-year eligibility period.
For more foundational context on terminology and scope, check out SC-RSC-EL Meaning and What Does SC-RSC-EL Stand For?, and when you're ready to test your recall of everything on this page, head back to the main practice test hub for full-length simulated exams.