- What Is the TN-EC Certification?
- Who Governs and Administers the Exam
- Exam Format, Timing, and Scoring
- The 12 TN-EC Exam Domains
- Approved References for the Open-Book Exam
- Registration, Fees, and Scheduling
- Requirements Beyond the Exam
- CE Classification vs. Limited Licensed Electrician
- Building a Domain-Weighted Study Plan
- Who Hires TN-EC Certified Contractors
- Frequently Asked Questions
- The TN-EC exam has 100 questions, a 5-hour limit, and requires a 73% passing score.
- Prov charges $53 per attempt and has administered exam appointments since July 1, 2026.
- Wiring and Protection is the heaviest domain at 23%, followed by Wiring Methods and Materials at 15%.
- The exam is open-book, using four listed references including the 2017 NEC and OSHA 29 CFR Part 1926.
What Is the TN-EC Certification?
The Tennessee Electrical (CE) Contractor Examination, commonly shortened to TN-EC, is the licensing exam that the Tennessee Board for Licensing Contractors requires for the statewide Electrical (CE) contractor classification. This classification is the one most commonly used for covered electrical projects valued at $25,000 or more, which puts it squarely in the path of anyone who wants to bid, contract, and supervise larger commercial or residential electrical jobs across Tennessee.
Passing the TN-EC exam is only one piece of the licensing puzzle, but it is the piece most candidates spend the most time preparing for. If you're still getting oriented, our companion pieces on What Is TN-EC? and TN-EC Meaning walk through the terminology in more depth, while this article focuses on the mechanics of the exam itself: format, domains, fees, and what happens after you pass.
Who Governs and Administers the Exam
The Tennessee Board for Licensing Contractors is the regulatory body that governs the Electrical (CE) contractor classification. Actual exam delivery is handled by Prov, which has administered new exam appointments since July 1, 2026. The current Prov candidate bulletin is dated July 13, 2026, and it's the authoritative source for scheduling rules, allowed materials, and identification requirements on test day.
Because a testing-vendor transition happened in mid-2026, candidates who studied older material should double-check that they're working from the current bulletin rather than outdated instructions. If you want a condensed version of the most current rules and figures, the TN-EC Cheat Sheet 2026: One-Page Review of Must-Know Facts is built for exactly that kind of quick reference.
Exam Format, Timing, and Scoring
The TN-EC exam is a computer-based, multiple-choice test with these fixed parameters:
- 100 questions covering all 12 content domains
- 5-hour time limit to complete the exam
- 73% passing score required to pass
- Open-book format using a defined set of approved references
- Delivered either at a physical test center or remotely via Examroom
The open-book format is a double-edged sword. It removes the burden of pure memorization, but it also means the exam expects you to locate and apply code sections and reference material quickly under time pressure - five hours for 100 questions sounds generous until you're flipping through the NEC mid-exam. Familiarity with your references matters as much as raw electrical knowledge. For a full breakdown of what "73%" actually means in terms of missed questions, see TN-EC Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Practice navigating your printed or tabbed references before exam day. In an open-book, time-limited exam, the speed of finding the right code section often matters more than memorizing it word-for-word.
The 12 TN-EC Exam Domains
The TN-EC exam is built from 12 content domains, and they are not weighted evenly. Two domains carry the most documented weight:
Domain 4: Wiring and Protection (23%)
This is the single largest domain on the exam, covering nearly a quarter of all questions. It centers on overcurrent protection, conductor sizing and protection, grounding and bonding, and the protective measures that keep circuits safe under fault conditions.
- Expect heavy reliance on NEC Article references for conductor and device protection
Domain 5: Wiring Methods and Materials (15%)
The second-largest domain, focused on the physical installation side: raceways, cable types, boxes, fittings, and the material rules that govern how wiring is actually run in the field.
- Strong overlap with hands-on installation experience
The remaining ten domains - General Electrical Knowledge, Plan Reading, Code Reading, Equipment for General Use, Motors and Controls, Communication Systems, Special Occupancy, Special Equipment, Hazardous Locations, and OSHA Safety - round out the rest of the question pool. None of them is documented at the weight of Wiring and Protection or Wiring Methods and Materials, but collectively they still make up the majority of the exam, so no domain is truly safe to skip. A full domain-by-domain breakdown, including how each one tends to show up in question wording, is available in the TN-EC Exam Domains 2026: Complete Guide to All 12 Content Areas.
Approved References for the Open-Book Exam
Because TN-EC is open-book, knowing exactly which references you're allowed to bring - and knowing them well - is a major preparation advantage. The listed references are:
- 2017 National Electrical Code
- Ugly's Electrical References (2020)
- OSHA 29 CFR Part 1926
- American Electricians' Handbook, 17th Edition
Note the code edition: it's the 2017 NEC, not a newer cycle, so studying from the wrong edition can cost you points on questions where table numbers or article language have shifted between editions. OSHA 29 CFR Part 1926 backs the OSHA Safety domain directly, while Ugly's Electrical References and the American Electricians' Handbook function as quick-lookup companions for calculations, tables, and formulas you don't want to derive from scratch during a timed exam.
Registration, Fees, and Scheduling
The exam itself is administered through Prov, with a per-attempt fee of $53. That fee is separate from the broader licensing costs tracked by the Tennessee Board for Licensing Contractors:
| Item | Cost / Detail |
|---|---|
| Prov exam fee (per attempt) | $53 |
| Initial contractor application fee | $250 |
| License renewal (every 2 years) | $200 |
| Exam score validity | Typically 2 years |
Delivery options are flexible: candidates can sit for the TN-EC exam at a physical test center or remotely through Examroom, which matters for scheduling around job sites or rural locations far from a testing facility. Because scores are generally valid for two years, there's a real incentive to line up your exam attempt with the rest of your application timeline rather than passing the exam years before you're ready to submit the full contractor application. For a complete cost breakdown across the entire licensing process, see TN-EC Certification Cost 2026: Complete Pricing Breakdown, and for scheduling specifics check TN-EC Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Requirements Beyond the Exam
Passing the exam is necessary but not sufficient. The full Electrical (CE) licensing package also requires:
- Passing the separate Tennessee Business and Law exam
- Documentation of relevant electrical experience
- A qualifying reference
- Proof of financial capacity, either through a required financial statement or a Board-approved surety-bond route
- Liability insurance
- Workers' compensation coverage, or a documented exemption
These pieces are assembled alongside - not instead of - the technical exam prep, so it's worth mapping out your paperwork timeline early rather than scrambling after you pass. A complete eligibility walkthrough lives at TN-EC Requirements 2026: Eligibility, Prerequisites & How to Qualify.
CE Classification vs. Limited Licensed Electrician
One of the most common points of confusion is how the Electrical (CE) classification differs from the Limited Licensed Electrician pathway. They are distinct tracks with different scopes:
| Feature | Electrical (CE) Contractor | Limited Licensed Electrician |
|---|---|---|
| Governing body | Tennessee Board for Licensing Contractors | Separate limited licensing pathway |
| Typical project scope | Covered electrical projects generally $25,000 and above | Narrower, limited scope of work |
| Exam | TN-EC (100 questions, open-book) | Different examination track |
If your career goal is to bid and run larger commercial or industrial electrical contracts, the CE classification - and the TN-EC exam behind it - is the relevant path. If you're unsure which track fits your situation, our overview articles like What Is A TN-EC? and What Does TN-EC Stand For? can help clarify the terminology before you commit to a study plan.
Building a Domain-Weighted Study Plan
Given the fixed weights for Wiring and Protection (23%) and Wiring Methods and Materials (15%), the most efficient study plans front-load those two domains, then rotate through the remaining ten. A simple multi-week structure might look like this:
Wiring and Protection
- Overcurrent protection, conductor sizing, grounding and bonding rules from the 2017 NEC
- Practice locating relevant NEC articles quickly using your open-book references
Wiring Methods and Materials
- Raceway types, cable installation rules, box and fitting requirements
- Cross-reference Ugly's Electrical References for quick lookup tables
Plan Reading, Code Reading, and OSHA Safety
- Drawing interpretation and code navigation drills
- OSHA 29 CFR Part 1926 review for the safety domain
Remaining Domains and Full Timed Practice
- Equipment for General Use, Motors and Controls, Communication Systems, Special Occupancy, Special Equipment, Hazardous Locations, General Electrical Knowledge
- Run full-length, 5-hour timed practice exams using your actual open-book references
Whatever pace you set, build in full-length timed practice using the actual reference set you'll bring to the exam. Our TN-EC Study Guide 2026: How to Pass on Your First Attempt expands this into a week-by-week plan, and you can run realistic practice questions modeled on the domain weighting directly on our practice test platform. If you're trying to gauge how difficult the exam will feel relative to your current experience level, How Hard Is the TN-EC Exam? Complete Difficulty Guide 2026 and TN-EC Pass Rate 2026: What the Data Shows are useful companion reads.
Who Hires TN-EC Certified Contractors
Because the CE classification is tied to covered electrical projects generally at or above $25,000, license holders typically work on larger-scope jobs than a limited electrician license would cover: commercial buildouts, multi-unit residential wiring, industrial installations, and projects requiring the contractor to carry liability insurance and workers' compensation coverage as part of the licensing requirements. Electrical contracting firms, general contractors bidding electrical scopes, and independent contractors bidding directly on qualifying projects all look for this credential when hiring or subcontracting. If you're evaluating whether the licensing investment fits your career plans, Is the TN-EC Certification Worth It? Complete ROI Analysis 2026 and TN-EC Salary Guide 2026: Complete Earnings Analysis dig into that question further, and TN-EC Jobs covers the kinds of roles that typically require or prefer the license.
Frequently Asked Questions
The exam has 100 multiple-choice questions with a 5-hour time limit, and you need a 73% score to pass.
Yes. It's open-book, and the listed references are the 2017 National Electrical Code, Ugly's Electrical References (2020), OSHA 29 CFR Part 1926, and the American Electricians' Handbook, 17th Edition.
Prov charges $53 per exam attempt. This is separate from the $250 initial contractor application fee and the $200 renewal fee due every two years.
Wiring and Protection is the largest domain at 23% of the exam, followed by Wiring Methods and Materials at 15%, making both strong priorities for early study time.
Yes. Prov offers both test-center and remote Examroom delivery options for the TN-EC exam.