- Eligibility Overview: Who Can Sit for the TX-ME Exam
- The 12,000-Hour Rule and Journeyman Prerequisite
- TDLR Application Process and Fees
- Exam Structure: Two Portions, One Combined Clock
- Domain Weighting You Need to Qualify Your Study Plan
- Approved Materials and Testing-Day Rules
- Timeline Planning Once TDLR Approves You
- After Passing: License Validity and Renewal Requirements
- Frequently Asked Questions
- You need 12,000 supervised hours under a Texas-licensed Master Electrician plus 2+ years holding a Journeyman Electrician license.
- A Journeyman Industrial license does not count - only the standard Journeyman Electrician license satisfies the prerequisite.
- TDLR must approve your application before you can schedule testing, and requirements must be completed within one year of TDLR receiving it.
- The exam has two separately timed, separately passed portions: NEC Knowledge (75 questions, 150 minutes) and Calculations (33 questions, 170 minutes), each...
Eligibility Overview: Who Can Sit for the TX-ME Exam
The Texas Master Electrician License Exam (TX-ME) is not an entry-level credential you can casually decide to attempt. Texas structures its electrical licensing ladder so that the Master Electrician tier sits at the top, above apprentice and Journeyman classifications, and the Texas Department of Licensing and Regulation (TDLR) gates access to the exam through documented experience review before you ever see a test question. If you're still deciding whether the exam is right for your career stage, it helps to first understand what TX-ME actually is and how it differs from journeyman-level credentials.
Eligibility for TX-ME hinges on two intertwined factors: a minimum number of supervised field hours, and a minimum tenure holding a specific type of Journeyman license. Both must be satisfied and verified before TDLR grants approval to test. This article breaks down exactly what's required, how the application and fee process works, and how the exam itself is structured so you can plan a realistic path to license day.
The 12,000-Hour Rule and Journeyman Prerequisite
The core eligibility requirement for TX-ME is 12,000 hours of supervised on-the-job experience performed under the direct supervision of a Texas-licensed Master Electrician. This isn't self-reported time on a resume - the supervising master electrician must personally verify the hours as part of your application package, which means your work history needs to be traceable and documented in real time, not reconstructed after the fact.
Alongside the hours requirement, applicants must have held a Journeyman Electrician license for at least two years. This is where a surprising number of otherwise-qualified electricians run into trouble: a Journeyman Industrial license does not satisfy this requirement. If your journeyman credential is the industrial variant rather than the standard Journeyman Electrician license, that time doesn't count toward your two-year clock for Master eligibility, regardless of how much supervised experience you've accumulated during it.
Key Takeaway
Before you invest study time, confirm your license type is the standard Journeyman Electrician license (not Journeyman Industrial) and that your supervising Master Electrician is prepared to verify your hours on the TDLR application.
Why This Prerequisite Structure Exists
TDLR's licensing ladder is designed so that candidates arrive at the TX-ME exam having already handled a wide range of field scenarios - services, feeders, branch circuits, motors, special occupancies - under supervision, before being tested on the National Electrical Code (NEC) knowledge and calculation skills that a Master Electrician is expected to apply independently, including reviewing plans, sizing services, and signing off on work that Journeyman-level electricians perform.
TDLR Application Process and Fees
Once your hours and license tenure are in order, the next step is the formal TDLR application. The fee structure is straightforward and split between the state agency and the testing vendor:
- TDLR license application fee: $45
- PSI examination fee: $78 to take both portions in a single sitting
- PSI retake fee: $78 to retake one or both portions if you don't pass on the first attempt
PSI administers the exam on TDLR's behalf, but TDLR is the licensing authority that reviews your eligibility documentation first. You cannot skip straight to PSI registration - TDLR approval is required before testing, and once TDLR receives your application, you have one year to complete all licensing requirements, including passing both exam portions. If that window closes, you'll need to restart the eligibility and application process.
Exam Structure: Two Portions, One Combined Clock
The TX-ME exam is delivered as two separately timed, separately scored portions, and you must pass each one independently - passing one portion doesn't offset a lower score on the other.
| Portion | Administered Questions | Scored / Unscored | Time Allotted | Passing Score |
|---|---|---|---|---|
| NEC Knowledge | 75 | 70 scored / 5 unscored | 150 minutes | 70% |
| Calculations | 33 | 30 scored / 3 unscored | 170 minutes | 70% |
Combined, that's 108 administered questions across 320 minutes of total testing time. A critical detail candidates often overlook: unused time cannot transfer between portions. Finishing NEC Knowledge in 100 minutes doesn't add 50 minutes to your Calculations clock - each portion's time allowance is fixed and independent, which has real implications for pacing strategy, especially on the calculation-heavy portion where working through formulas takes longer per question.
Both portions are computer-based, multiple-choice, and open-book, and are offered in English and Spanish at PSI test centers. For a deeper dive into exactly what "70% on each portion separately" means for your score calculation and margin for error, see TX-ME Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Because time doesn't transfer between portions, practice pacing each portion in isolation - 150 minutes for 75 NEC Knowledge questions, 170 minutes for 33 Calculations questions - rather than treating 320 minutes as one flexible pool.
Domain Weighting You Need to Qualify Your Study Plan
Eligibility gets you to the testing room, but knowing where the questions concentrate is what turns eligibility into a pass. The NEC Knowledge portion draws from ten domains, and the Calculations portion draws from ten parallel-but-distinct domains - note that several domain names repeat across the two portions, but they represent different question types and skills within each context.
NEC Knowledge Domains (70 scored questions)
Two domains tie for the largest share of the Knowledge portion, and both deserve proportionally heavier study time.
- Domain 2, Electrical Services, Service Equipment, and Separately Derived Systems: 11 of 70 scored questions
- Domain 4, Branch Circuit Conductors: 11 of 70 scored questions
- Domain 6, Electrical Equipment and Devices: 8 of 70
- Domain 9, Special Occupancies, Equipment, and Conditions: 8 of 70
- Domains 1, 3, 5, 7, 8, and 10 fill out the remainder at 7, 4, 7, 3, and 4 scored questions respectively (Domain 1 at 7, Domain 3 at 4, Domain 5 at 7, Domain 7 at 7, Domain 8 at 3, Domain 10 at 4)
Calculations Domains (30 scored questions)
Domain 12 dominates the Calculations portion by a wide margin, making it the single highest-leverage topic to master for this half of the exam.
- Domain 12, Electrical Services, Service Equipment, and Separately Derived Systems: 8 of 30 scored questions
- Domain 14, Branch Circuit Calculations and Conductors: 4 of 30
- Domain 17, Motors and Generators: 6 of 30
- Domains 11, 13, 15, 16, 18, 19, and 20 make up the remaining questions at 2, 3, 2, 2, 1, 1, and 1 respectively
If you map that back to real-world work, it makes sense: Services and Branch Circuit Conductors are the tasks Master Electricians handle most on the job, both in specifying/inspecting NEC compliance and in calculating loads. For the complete breakdown of every domain with study guidance for each, read TX-ME Exam Domains 2026: Complete Guide to All 20 Content Areas.
Approved Materials and Testing-Day Rules
Because both portions are open-book, what you're allowed to bring into the test center matters as much as what you know. TDLR and PSI enforce specific rules:
- Only an approved softbound NEC is permitted - NEC Handbooks, loose-leaf editions, spiral-bound or ring-bound copies, and any added papers are prohibited.
- Notes, highlighting, and underlining prepared before test day are allowed in your code book.
- Tabs must be permanent, NEC-publisher-manufactured or supplied tabs - writing in your reference book during the actual test session is prohibited.
- A silent, battery-operated, nonprinting, nonprogrammable calculator without alphabetic capability is permitted for the Calculations portion.
These rules are strictly enforced at PSI centers, and showing up with a noncompliant code book (even an otherwise-valid NEC edition in the wrong binding) can mean you're turned away from testing entirely. Build your open-book strategy around these constraints well before your scheduled date - our TX-ME Study Guide 2026: How to Pass on Your First Attempt walks through how to prep your tabbed code book for maximum speed during the exam.
Timeline Planning Once TDLR Approves You
Once TDLR approves your eligibility, the clock starts on that one-year completion window. A sensible way to use the weeks leading up to your PSI appointment is to weight study time toward the domains that carry the most scored questions, without ignoring the smaller domains that can still swing a portion score by a few points.
Services and Branch Circuit Foundations
- Deep review of Domain 2 and Domain 4 (11 scored questions each on Knowledge)
- Parallel review of Domain 12 (8 scored questions on Calculations, the single largest Calculations domain)
Equipment, Occupancies, and Motors
- Domain 6 and Domain 9 on Knowledge (8 scored questions each)
- Domain 17, Motors and Generators, on Calculations (6 of 30 scored questions)
Remaining Domains and Timed Practice
- Cover smaller-weight domains across both portions (Domains 1, 3, 5, 7, 8, 10 on Knowledge; Domains 11, 13-16, 18-20 on Calculations)
- Run full timed practice sessions honoring the 150-minute and 170-minute separate clocks
If you're still weighing how demanding this preparation load really is relative to your current schedule and job, How Hard Is the TX-ME Exam? Complete Difficulty Guide 2026 covers the difficulty factors in more depth, and TX-ME Pass Rate 2026: What the Data Shows reviews TDLR's official FY2025 examination-result figures by portion.
After Passing: License Validity and Renewal Requirements
Passing both portions doesn't end your obligations - the individual Master Electrician license itself is valid for one year, and renewal requires a $45 fee plus four TDLR-approved continuing education hours each cycle. Those CE hours must cover the NEC, Texas electrical law and rules, and NFPA 70E electrical safety topics, so ongoing education is a built-in part of holding this license, not a one-time hurdle.
It's also worth understanding that the individual Master Electrician license is distinct from the separate Electrical Contractor business license. Passing TX-ME and holding your individual license doesn't automatically authorize you to operate as a licensed contracting business in Texas - that's a separate TDLR credential with its own requirements.
If you're evaluating whether the time and expense of reaching Master status pays off in terms of job opportunities and earning potential, TX-ME Salary Guide 2026: Complete Earnings Analysis and Is the TX-ME Certification Worth It? Complete ROI Analysis 2026 break down the return on investment in more detail, and TX-ME Jobs looks at who typically hires Master-licensed electricians.
Frequently Asked Questions
No. TDLR specifically requires a standard Journeyman Electrician license held for at least two years. Time spent holding a Journeyman Industrial license does not satisfy this prerequisite for TX-ME eligibility.
Your supervising Texas-licensed Master Electrician must verify the hours as part of your application. Self-reported time without that verification will not satisfy TDLR's eligibility review.
No. TDLR approval is required before you can test with PSI. Attempting to register before approval simply isn't possible under the current process.
TDLR requires that all licensing requirements, including passing both exam portions, be completed within one year after TDLR receives your application. Missing that window means restarting the eligibility and application process.
No. NEC Knowledge and Calculations are scored independently, and you need 70% on each separately. If you pass only one, the $78 PSI retake fee applies to retake the portion you didn't pass.