Texas - Residential Wireman Electrician

Texas Residential Wireman Electrician Exam: What You Need to Know (2026)

If you're working toward your Texas Residential Wireman license, the state exam is the last gate between you and the credential. It's an open-book, NEC-based test — but don't let that fool you. Without solid prep, the clock runs out fast and the questions can catch you off guard. This guide covers exactly what's on the Texas residential wireman electrician exam, what to study, and how to walk in ready. Start with our free practice exam to see where you stand right now.

Texas Residential Wireman Electrician Exam Overview

The exam is administered by PSI on behalf of TDLR. Here's what you're looking at:

• Total questions: 85 (80 scored + 5 non-scored pilot items)
• Time limit: 240 minutes for the 80 scored items, plus 20 additional minutes for the 5 non-scored items — 4 hours and 20 minutes total
• Passing score: 70% of scored questions
• Format: Multiple-choice, open book (any soft-bound NEC edition; questions are based on the TDLR-adopted 2023 NEC)
• Exam fee: $64
• Testing provider: PSI

The 5 non-scored items won't affect your score, but you won't know which ones they are, so answer every question as if it counts. Check the official exam bulletin for the full candidate handbook.

Heads up: Effective September 1, 2026, TDLR exams will reference the 2026 NEC. Confirm the current edition requirement with TDLR or PSI before your test date.

Topics Covered on the Exam

The exam pulls from ten topic areas. Here's what each one covers:

1. Definitions, Calculations, Theory, and Plans — NEC definitions, load calculations, basic electrical theory, and reading plans. Heavy weight here.
2. Electrical Services, Service Equipment, and Separately Derived Systems — Service entrance conductors, service equipment, and transformer-based derived systems.
3. Electrical Feeders — Feeder sizing, OCPD selection, and feeder conductor requirements.
4. Branch Circuit Calculations and Conductors — Conductor identification, branch circuit sizing, ampacity, and derating.
5. Electrical Wiring Methods and Electrical Materials — Conduit types, cable assemblies, boxes, fittings, and installation rules.
6. Electrical Equipment and Devices — Receptacles, switches, luminaires, panelboards, and equipment ratings.
7. Motors and Generators — Motor branch circuits, OCPD, controller sizing, nameplate ratings.
8. Electrical Control Devices and Disconnecting Means — Disconnect requirements, control circuit wiring, and related NEC rules.
9. Special Occupancies, Equipment, and Conditions — Hazardous locations, manufactured housing, pools, and similar conditions.
10. Renewable Energy Technologies — Photovoltaic systems (Article 690) and electric vehicle charging equipment (Article 625).

Spend the most time on Services and Service Equipment (16 items), Branch Circuit Calculations and Conductors (14), and Equipment and Devices (12) — those carry the heaviest weight on the actual exam.

Sample Questions

Here are five questions pulled directly from the exam topic areas. Try them without your NEC first, then see how well your book skills hold up.

Question 1 — Electrical Feeders (Medium)

What is the maximum total voltage drop recommended for both feeders and branch circuits combined to the farthest outlet?

• A) 3 percent
• B) 4 percent
• C) 5 percent
• D) 6 percent

Question 2 — Electrical Wiring Methods and Electrical Materials (Medium)

Where raceways contain _____ AWG or larger insulated circuit conductors that enter a cabinet, box, enclosure, or raceway, the conductors shall be protected by an identified fitting or other approved means.

• A) 6
• B) 4
• C) 3
• D) 2

Question 3 — Branch Circuit Calculations and Conductors (Easy)

Grounded conductors of 6 AWG or smaller shall be identified by which of the following means?

• A) A continuous black outer finish
• B) A continuous white or gray outer finish
• C) A continuous red outer finish
• D) A continuous green outer finish

Question 4 — Special Occupancies, Equipment, and Conditions (Medium)

According to the NEC, Class I, Division 1 locations are those where ignitable concentrations of flammable gases or vapors can exist under which conditions?

• A) Only during abnormal operating conditions
• B) Under normal operating conditions
• C) Only when equipment fails
• D) Only during maintenance operations

Question 5 — Electrical Services, Service Equipment, and Separately Derived Systems (Hard)

For conductors 4 AWG and larger, which method is NOT acceptable for identifying grounded conductors?

• A) A continuous white outer finish
• B) A continuous gray outer finish
• C) Three continuous white stripes on green insulation
• D) White or gray marking at terminations that encircles the conductor

Know the answers? Check yourself with the free Texas residential wireman electrician practice exam — no account needed.

What Types of Questions to Expect

Here's the breakdown by topic, including how many practice questions we have for each area:

• Definitions, Calculations, Theory, and Plans (341 questions) — Expect load calculations, voltage-drop math, NEC definitions, and blueprint reading. The largest topic by far.
• Electrical Feeders (255 questions) — Feeder ampacity, conductor sizing, OCPD coordination. Calculation-heavy.
• Motors and Generators (231 questions) — Motor branch circuit sizing, overload protection, controller ratings, and nameplate interpretation.
• Electrical Services, Service Equipment, and Separately Derived Systems (91 questions) — Service conductor sizing, grounding electrode systems, transformer-derived circuits, and neutral sizing.
• Branch Circuit Calculations and Conductors (79 questions) — Conductor identification (like Question 3 above), ampacity tables, and branch circuit ratings.
• Electrical Equipment and Devices (66 questions) — Device and equipment installation rules, ratings, and NEC article requirements.
• Electrical Wiring Methods and Electrical Materials (59 questions) — Raceway fill, fitting requirements, cable types, and installation restrictions.
• Special Occupancies, Equipment, and Conditions (42 questions) — Hazardous location classifications, wet/damp locations, pools and spas.
• Electrical Control Devices and Disconnecting Means (12 questions) — Disconnect sizing and placement, control circuit rules.
• Renewable Energy Technologies (12 questions) — Photovoltaic system requirements and EV charging equipment.

Total practice questions available: 1,188 — drawn from every topic on the exam.

Study Materials

The NEC — Your Only Allowed Reference

The National Electrical Code 2023 is the one book you're permitted to bring into the exam. That makes it the most important thing in your prep — not just as a reference, but as a tool you need to know how to use fast under pressure.

Get a soft-bound copy. Loose-leaf, spiral-bound, and ring-bound versions are not allowed at the test site. Tabs must be publisher-manufactured NEC tabs — no homemade tabs.

Before exam day, you should know where to find:
- Article 100 definitions
- Tables 310.12 and 310.16 (ampacity)
- Articles 230, 240, 250, 300, 310, 430, and 690
- The load calculation article (Article 220)

Highlighting and notes are allowed before the exam. You cannot mark in the book during the exam session itself.

Study Tips

Use timed practice. A PDF study guide won't prepare you for the clock. The Texas residential wireman electrician practice test format on our site matches the real PSI exam — same question count, same time limit. Practice in that format so you're not adjusting to it on test day.

Drill the NEC, don't just read it. The test is open book, but you won't have time to look up everything from scratch. You need to know the structure well enough to find answers in 2–3 minutes.

Start with your weak topics. After your first free practice exam attempt, look at where you got tripped up. Definitions and feeder calculations are common stumbling blocks — address them first.

Control anxiety. A little nerves before a test is normal — don't fight it. If you lock up on a question, take a breath, mark it, and move on. Come back at the end. The clock keeps running if your test center allows a break, so use breaks only if you need them.

Register early. After TDLR approves your eligibility, you'll receive instructions to schedule with PSI. You can register at the exam registration page, by phone at (833) 333-4741 (Mon–Fri 6:30 am–9:00 pm, Sat–Sun 8:00 am–4:30 pm CT), or by mailing a completed form with the $64 fee.

Frequently Asked Questions

How many questions are on the Texas Residential Wireman Electrician exam?
The exam has 85 total items — 80 scored and 5 non-scored pilot questions. Only the 80 scored items count toward your result. You won't know which questions are unscored, so treat every question the same.

How long do I have to complete the exam?
You get 240 minutes (4 hours) for the 80 scored items, plus an extra 20 minutes allocated for the 5 non-scored items — 4 hours and 20 minutes total.

What is the passing score?
You need to answer 70% of the scored questions correctly. That's 56 out of 80 scored items.

What is the exam fee?
The examination fee is $64, payable when you register with PSI.

How do I register?
Once TDLR approves your eligibility, you'll receive scheduling instructions. Register through the exam registration page, call PSI at (833) 333-4741, or mail in a registration form with your fee.

Is the exam open book?
Yes. Any soft-bound edition of the NEC is allowed — questions are based on the TDLR-adopted 2023 NEC (the 2026 NEC starting September 1, 2026). No loose-leaf, spiral-bound, or ring-bound copies. You can pre-tab with official NEC publisher tabs, highlight, and add notes before the exam — but no marking during the exam session.

Can I use a calculator?
Yes — non-programmable, silent, battery-operated calculators with no alphabetic keyboard and no paper tape printer are allowed.

What ID do I need?
One valid government-issued photo ID showing your name, photo, signature or fingerprint, date of birth, and expiration date. The name must match what TDLR submitted to PSI.

What if I need to cancel or reschedule?
You can cancel or reschedule without losing your fee if PSI receives your notice at least 2 days before your appointment. Cancel late, miss the appointment, arrive after the start time, or show up without proper ID, and you forfeit the $64 fee.

Ready to Get Started?

The Texas Residential Wireman license is a real credential that opens doors — more job sites, better pay, and the ability to sign off on your own work. The exam is beatable with the right prep.

Start with our free practice exam — 10 questions, no account needed, no credit card. Get a feel for the question style and see where your NEC navigation stands. When you're ready to go deeper, the full practice exam mirrors the real test: 80 questions, same time limit, full topic breakdown, and a score report showing exactly where to focus. Check the state licensing website for any updates to requirements, and review the official exam bulletin before your test date. Pick up your NEC 2023, get your tabs set, and start drilling. You've got this.