What You Need to Know About the Texas Master Sign Electrician Test
You've put in the work. Now you need to pass one exam to make it official. The Texas master sign electrician test is administered by PSI on behalf of TDLR, and it covers everything from NEC fundamentals to sign-specific wiring rules. Pass it, and you can pull permits and run sign electrical work as a master in Texas. This article breaks down exactly what's on the exam, what to bring, and how to prepare without wasting time.
Want to see what the questions actually look like? Start with our free practice exam — no account needed.
Texas Master Sign Electrician Exam Overview
Here are the basics from the official exam bulletin:
- Questions: 105 total — 100 scored, 5 unscored (pilot items)
- Time: 300 minutes for the scored items, plus 20 extra minutes for the 5 unscored items
- Passing score: 70% on the scored questions
- Format: Open book — you bring your own 2026 NEC soft-bound copy
- Administered by: PSI on behalf of TDLR
The 5 unscored questions don't affect your result. You won't know which ones they are, so treat every question the same. The time allowance is generous — just over five hours — but the material is dense. You need a plan, not just time.
Topics Covered on the TX Sign Electrician Exam
The exam pulls from nine topic areas. Here's what each one covers:
- Definitions, Calculations, and Theory — NEC structure, electrical theory, Ohm's law, basic load calculations
- Electrical Services, Service Equipment, and Separately Derived Systems — service entrance sizing, metering, transformers, grounding
- Electrical Feeders — feeder sizing, conductor ampacity, demand factors
- Branch Circuit Calculations and Conductors — branch circuit sizing, wire selection, overcurrent protection
- Electrical Wiring Methods and Electrical Materials — conduit types, cable assemblies, boxes, fittings
- Electrical Equipment and Devices — switches, receptacles, flexible cords, neon tubing clearances
- Motors — motor circuit calculations, overload protection, disconnecting means
- Electrical Control Devices and Disconnecting Means — control panels, switches, disconnects for signs
- Electric Signs and Outline Lighting — the sign-specific NEC rules you'll use every day on the job
The sign-specific topic is the reason you're sitting for this particular exam rather than a general electrician exam. Know Article 600 inside and out. The broader NEC topics — wiring methods, branch circuits, services — are high-volume as well, so don't skip them.
Sample Questions From the Texas PSI Master Sign Electrician Exam
Here are five real-format questions that reflect what you'll see on the Texas PSI Master Sign Electrician exam. Read them carefully — then check your reasoning against our practice exam.
Question 1 — Electrical Services, Service Equipment, and Separately Derived Systems
For multiwire branch circuits, what is required at the point where the branch circuit originates?
- A) GFCI protection on all conductors
- B) Individual overcurrent protection for each ungrounded conductor
- C) A means to simultaneously disconnect all ungrounded conductors
- D) Separate raceways for each ungrounded conductor
Question 2 — Electrical Feeders
What is the minimum free conductor length required at each outlet, junction, and switch point?
- A) 75 mm (3 in.)
- B) 100 mm (4 in.)
- C) 150 mm (6 in.)
- D) 200 mm (8 in.)
Question 3 — Electrical Equipment and Devices
What is the minimum spacing required between neon tubing and the nearest surface, other than its support?
- A) 3 mm (1/8 in.)
- B) 6 mm (1/4 in.)
- C) 13 mm (1/2 in.)
- D) 19 mm (3/4 in.)
Question 4 — Definitions, Calculations, and Theory
Which chapters of the NEC apply generally to all electrical installations?
- A) Chapters 1, 2, 3, and 4
- B) Chapters 5, 6, and 7
- C) Chapters 1 through 7
- D) Chapter 8 and Chapter 9
Question 5 — Electrical Equipment and Devices
What is the maximum voltage rating allowed for flexible cords and flexible cables listed in Table 400.4?
- A) 300 volts
- B) 600 volts
- C) 1000 volts
- D) 2000 volts
Don't guess blind — take our free practice exam and see how you actually score.
What Types of Questions to Expect
Here's a topic-by-topic breakdown of the kinds of problems on the exam:
- Definitions, Calculations, and Theory: NEC structure questions, Ohm's law applications, power and load calculations, understanding which NEC chapters apply to which installations
- Electrical Services, Service Equipment, and Separately Derived Systems: Service sizing, separately derived system grounding, transformer secondary connections, metering equipment rules
- Electrical Feeders: Feeder conductor sizing, ampacity tables, demand factors, free conductor length requirements
- Branch Circuit Calculations and Conductors: Branch circuit sizing, multiwire circuits, OCPD selection, conductor ampacity and derating
- Electrical Wiring Methods and Electrical Materials: Conduit fill, cable types, box sizing, fitting and connector rules
- Electrical Equipment and Devices: Flexible cord ratings, neon tubing clearances, receptacle and switch installation rules — the largest topic area by question count
- Motors: Motor circuit calculations, overload protection sizing, locked-rotor current
- Electrical Control Devices and Disconnecting Means: Disconnect requirements, control circuit rules, switch ratings for sign circuits
- Electric Signs and Outline Lighting: Article 600 rules — clearances, wiring inside signs, disconnect requirements, field-wiring compartments
Total practice questions available: 3,505
Study Materials for the Master Sign Electrician Exam
You need the right tools. Here's what to bring to your study sessions — and to the exam itself.
Required Book
NEC 2026 — This is the only reference allowed in the exam room. Get the soft-bound edition. Loose-leaf, spiral-bound, and ring-bound copies are not permitted. The NEC Handbook is also prohibited. Buy it early so you have time to tab and annotate it before test day.
Recommended Supplies
NEC publisher index tabs — Tabbing your NEC by article is one of the best things you can do for open-book speed, but the Texas exam allows only permanent index tabs manufactured and/or provided by the NEC book publisher. Homemade, DIY, or other third-party tabs are not permitted, and candidates who arrive with them must remove them, test without the book, or forfeit the exam fee.
Sharpie Highlighters — Highlight NEC rules as you study them. Color-code by topic: one color for sign-specific rules, another for grounding, another for wiring methods. Highlighting in your book is allowed — you just can't mark it up during the exam.
Non-Programmable Calculator — You'll need this for load calculations, conductor sizing, and motor problems. The exam rules require a silent, battery-operated calculator with no alphabet keyboard and no tape printer. This one fits every requirement and has a clear 8-digit display — exactly what you want when you're running numbers under time pressure.
Study Tips for the Sign Electrician Exam
Use short, regular sessions. Several 25–30 minute sessions across the week beat one long cram. Spaced repetition moves facts into long-term memory so they stick on exam day — not just the night before.
Work through the open book strategically. On test day, answer what you know first and skip what you don't. Then go back. You can bookmark questions for later review — the same way our practice exam works. Don't burn 10 minutes on one question when you have 99 others to finish.
Tab your NEC before you get there. Know where Article 600 starts. Know where the ampacity tables are. Know where the grounding rules live. During the exam, you should be confirming answers, not hunting for sections.
Practice the way the real exam runs. Our full practice exam matches the actual PSI format — same number of questions, same time limit, same topic breakdown. That means no format surprises when you sit for the real thing. Start with the free version to get a feel for the question style, then move to the full exam for serious prep.
Get Started
You know what's on the exam, what to bring, and how to study. The next step is seeing where you actually stand. Take our free practice exam right now — 10 questions, no account required. When you're ready to run through the full 100-question format, upgrade to the full practice exam and get a detailed score breakdown by topic so you know exactly where to focus before test day. Good luck on the TX sign electrician exam.