What Is TX-RW?

What Is TX-RW?

TX-RW stands for the Texas Residential Wireman Electrician License Exam, the state-mandated licensing test overseen by the Texas Department of Licensing and Regulation (TDLR) and delivered through PSI Services LLC at computer-based testing centers. Passing this exam - combined with meeting TDLR's experience requirements - is what allows an electrician to legally hold a Residential Wireman license in Texas and perform wiring work on qualifying residential structures.

Unlike a generic industry certificate, TX-RW is a government-issued occupational license tied directly to the National Electrical Code (NEC) as adopted by Texas. If you're new to the credential entirely, our TX-RW Certification overview and TX-RW Meaning explainer both walk through the basics from a different angle than this article does.

Who Administers the Exam and How It's Structured

PSI Services LLC runs the actual test-day logistics - scheduling, check-in, proctoring, and score reporting - under contract with TDLR, which sets the content standards and licensing rules. The exam itself is a computer-based, multiple-choice test with a specific time and question structure that catches many first-time candidates off guard:

• 80 scored questions answered within 240 minutes
• 5 additional unscored (pilot) questions with an extra 20 minutes allotted
• Total: 85 questions across 4 hours and 20 minutes
• Available in English and Spanish

The unscored questions are mixed in without being labeled, so candidates should treat every question on screen as if it counts. For a full breakdown of how difficulty compares to other trade exams, see How Hard Is the TX-RW Exam? Complete Difficulty Guide 2026.

What's Actually Tested: The 10 Domains

TX-RW content is organized into ten domains with fixed scored-item counts. Knowing exactly how many questions come from each area lets you prioritize study time instead of re-reading the entire NEC cover to cover.

Domain 2 (Electrical Services, Service Equipment, and Separately Derived Systems) is the single largest domain at 16 questions, followed by Domain 4 (Branch Circuit Calculations and Conductors) at 14 and Domain 6 (Electrical Equipment and Devices) at 12. Together these three domains account for a substantial share of the entire scored exam. For an in-depth breakdown of what each domain actually covers topic by topic, read TX-RW Exam Domains 2026: Complete Guide to All 10 Content Areas.

Domains 7, 8, and 10 (Motors and Generators, Electrical Control Devices and Disconnecting Means, and Renewable Energy Technologies) are each worth only 2 scored questions. Don't ignore them entirely, but don't let them eat study hours that belong to the bigger domains.

Fees, Registration, and Scheduling

TX-RW involves two separate fee lines that candidates sometimes confuse:

• Examination fee: $64 per attempt, paid to PSI when scheduling
• Initial license application fee: $20, paid to TDLR

TDLR must approve your application before PSI will let you schedule a test date - approval happens first, scheduling second. Once approved, all remaining licensing requirements, including passing the exam, must be completed within one year of the application date. If you fail an attempt, you can retake the exam during that same eligibility window by paying the $64 fee again. A detailed cost breakdown across the full licensing path, including renewal fees, is available in TX-RW Certification Cost 2026: Complete Pricing Breakdown.

Qualifying to Sit for the Exam

TX-RW isn't open to anyone who wants to register. TDLR requires candidates to document their path into the trade before an application is approved:

• 4,000 hours of on-the-job experience, supervised by a Texas-licensed Master Electrician or Residential Wireman, or
• Completion of a TDLR-approved career and technology education (CTE) program

Each supervisor who signed off on your hours must independently provide signed experience verification - if you worked under more than one licensed supervisor, you need documentation from each one separately, not a single combined statement. Missing or incomplete verification is one of the most common reasons applications stall at TDLR before ever reaching the exam-scheduling stage. Full detail on acceptable documentation and program options is in TX-RW Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Open-Book Rules and Your NEC Codebook

TX-RW is an open-book exam, but "open book" comes with specific restrictions that trip up otherwise well-prepared candidates:

• You may bring a softbound NEC with notes, highlighting, or underlining - but only if that markup was completed before test day
• Permanent tabs manufactured or provided by the NEC publisher are allowed
• Homemade tabs, third-party tabs, movable tabs, added sheets, the NEC Handbook, and loose-leaf, spiral-bound, or ring-bound books are all prohibited
• You cannot mark the book during the exam itself - an electronic notepad is provided for scratch work instead

Unless a question specifically instructs otherwise, assume standard calculation methods and copper conductors. Code exceptions and optional calculation methods only apply when the question explicitly directs you to use them - a subtle but important reading-comprehension trap built into how TX-RW questions are worded.

Passing Score and What the Data Shows

TX-RW requires a 70% passing score across the 80 scored questions. The five pilot questions don't count toward your result, though you won't know which ones they are while testing. See TX-RW Passing Score 2026: Exactly What You Need to Pass for how that percentage translates into raw questions you can afford to miss.

TDLR's fiscal-year 2025 data shows a Residential Wireman exam-attempt pass rate of 30.15% - 331 passes against 767 failures across 1,098 total examinations, with 83 additional no-shows tracked separately. This figure reflects attempts, not unique first-time candidates, and it isn't a projection for 2026. Still, it's a useful signal: a large share of attempts end in failure, which argues strongly against walking in underprepared. A deeper statistical breakdown lives in TX-RW Pass Rate 2026: What the Data Shows.

Scope of Work, Renewal, and Career Path

A Texas Residential Wireman license permits work on single-family and multifamily dwellings not exceeding four stories - it does not authorize commercial or industrial electrical work, which falls under separate license classifications. Residential Wiremen are typically hired by residential electrical contractors, homebuilders, and remodeling companies working within that structural scope.

Once licensed, renewal is annual and requires:

• A $20 renewal fee
• 4 hours of TDLR-approved continuing education, covering the NEC, Texas electrician law and rules, and NFPA 70E safety

Curious how the license translates into pay and job outlook? Check TX-RW Salary Guide 2026: Complete Earnings Analysis and TX-RW Jobs for career-side detail, or Is the TX-RW Certification Worth It? Complete ROI Analysis 2026 if you're still weighing whether to pursue it at all.

How to Prepare Without Wasting Time

Because scored questions are unevenly distributed across the 10 domains, the most efficient prep plan mirrors that weighting rather than treating every domain equally. A short, focused review cadence - working through heavier domains first while they're fresh, then circling back to lighter domains near the end - tends to outperform a flat read-through of the code book.

For a printable summary of must-know facts across every domain, bookmark TX-RW Cheat Sheet 2026: One-Page Review of Must-Know Facts, and for a complete week-by-week study plan built around this weighting, see TX-RW Study Guide 2026: How to Pass on Your First Attempt. Running timed practice sessions on our TX-RW practice test platform before test day helps you get comfortable with the 240-minute pacing and question style before it counts for real.

Frequently Asked Questions