Texas Master Electrician Exam (NEC Knowledge Portion): Complete 2026 Study Guide
You've put in the hours on the job. You've built the experience. Now the Texas Master Electrician license is one exam away — and that exam is no joke. The NEC Knowledge Portion tests 75 questions in 150 minutes, and you need to answer at least 53 of them correctly to pass. That's a 70% passing score, and it demands real code fluency, not just general electrical knowledge. This guide breaks down exactly what's on the texas master electrician test, shows you real sample questions, and gives you a proven strategy for walking in and walking out with a passing score.
Texas Master Electrician Exam Overview
The NEC Knowledge Portion is administered by PSI at licensed testing centers. Here's what you're working with:
- Questions: 75 scored questions
- Time limit: 150 minutes
- Passing score: 70% (53 correct out of 75)
- Format: Multiple choice, open-book (you bring your NEC codebook)
- Administered by: PSI Exams
You can register for the psi master electrician exam texas through the exam registration page. Before you do, confirm your eligibility and licensing requirements with the state licensing website. The full official exam bulletin covers application steps, fees, and test center policies.
Open-book doesn't mean easy. With 150 minutes for 75 questions, you're averaging two minutes per question — and some questions will eat far more than that if you let them. Time management is everything.
What Topics Are on the Texas Master Electrician Test?
The exam covers ten topic areas, weighted by item count. Here's what to expect, ranked from heaviest to lightest:
- Branch Circuit Conductors (11 items): Conductor ampacity, adjustment and correction factors, overcurrent protection ratings, circuit sizing, and conductor identification. This is tied for the most heavily tested area.
- Electrical Services, Service Equipment, and Separately Derived Systems (11 items): Service disconnects, overhead and underground service conductors, service entrance sizing, grounding, bonding, and separately derived systems.
- Electrical Equipment and Devices (8 items): Switches, receptacles, panelboards, switchgear, and motor branch-circuit protection.
- Special Occupancies, Equipment, and Conditions (8 items): Hazardous location classifications, material groups, protection techniques, wiring methods, and equipment markings.
- Electrical Services — Definitions, Theory, and Plans (7 items): NEC purpose and scope, code arrangement, mandatory vs. permissive rules, and the authority having jurisdiction (AHJ).
- Electrical Wiring Methods and Electrical Materials (7 items): Ampacity tables, protection of cables and raceways, underground cover depths, and securing/support requirements.
- Motors and Generators (7 items): Conductor sizing, overload protection, short-circuit protection, disconnecting means, and controller requirements.
- Electrical Feeders (4 items): Continuous load rules, feeder overcurrent protection, load calculations with demand factors, and conductor identification.
- Renewable Energy Technologies (4 items): PV system voltage calculations, rapid shutdown, disconnecting means, overcurrent protection, and arc-fault protection.
- Electrical Control Devices and Disconnecting Means (3 items): Motor disconnect location and rating, switch ratings, controller ratings, and panelboard overcurrent protection.
Focus your study time on the topics with the highest item counts — branch circuits, services, equipment, and special occupancies account for more than half the exam.
Sample Texas Master Electrician Test Questions
Here are five sample questions that reflect the style and difficulty of what you'll see on the real exam. Read through them — do you know the answers?
Question 1 (Special Occupancies — Hard)
A chemical plant engineer asks you to evaluate equipment markings in a classified area. The equipment is marked with class and group but has no division marking. What does this indicate about the equipment's suitability?
- A) The equipment is suitable for Division 2 only
- B) The equipment marking is incomplete and must be rejected
- C) The equipment is suitable for both Division 1 and Division 2
- D) The equipment is suitable for unclassified locations only
Question 2 (Definitions, Theory, and Plans — Medium)
In the NEC code arrangement, which chapters apply generally to all electrical installations?
- A) Chapters 1, 2, 3, and 4
- B) Chapters 1 through 7
- C) Chapters 5, 6, and 7
- D) All chapters apply generally
Question 3 (Special Occupancies — Easy)
Areas designated as hazardous (classified) locations or determined to be unclassified shall be documented on an area classification drawing and made available to the _____ and those authorized to design, install, inspect, maintain, or operate electrical equipment at the location.
- A) Building owner
- B) Authority having jurisdiction (AHJ)
- C) Electrical contractor
- D) Facility manager
Question 4 (Definitions, Theory, and Plans — Easy)
According to Article 90, what is the primary purpose of the National Electrical Code?
- A) To provide design specifications for electrical systems
- B) The practical safeguarding of persons and property from hazards arising from the use of electricity
- C) To serve as an instruction manual for untrained persons
- D) To ensure efficient and convenient electrical installations
Question 5 (Motors and Generators — Easy)
In dwelling units, at least _____ 20-ampere branch circuit(s) shall be provided to supply bathroom receptacle outlets required by 210.52(D).
- A) One
- B) Two
- C) Three
- D) Four
Think you know the answers? Take our free practice exam to check yourself against the clock.
What Types of Questions to Expect
Here's what our practice question bank covers across all ten topic areas — and the kinds of problems each section throws at you:
- Definitions, Theory, and Plans: NEC purpose, code hierarchy, mandatory vs. permissive language, and AHJ authority. Many questions test whether you understand why a rule exists, not just what it says.
- Electrical Services, Service Equipment, and Separately Derived Systems: Service disconnect location and rating, clearance requirements, service entrance conductor sizing, grounding electrode conductor sizing, and separately derived system bonding. Expect calculations and code-look-up questions.
- Electrical Feeders: Feeder ampacity for continuous loads (the 125% rule), demand factor calculations for dwelling and commercial occupancies, and ground-fault protection requirements for large disconnects.
- Branch Circuit Conductors: This is a heavy topic. Expect conductor sizing per NEC 210.19, overcurrent protection per 210.20, ampacity table lookups from Table 310.16, and adjustment/correction factor calculations.
- Electrical Wiring Methods and Electrical Materials: Cover depth tables, conduit support spacing, cable protection in framing members, and temperature rating applications.
- Electrical Equipment and Devices: Switch and receptacle rules, panelboard overcurrent protection, motor branch-circuit conductor and OCPD sizing, and controller requirements.
- Motors and Generators: This is our largest pool. Questions cover conductor sizing per 430.22, OCPD ratings per Table 430.52(C)(1), overload trip percentages per 430.32, and disconnect type and location.
- Electrical Control Devices and Disconnecting Means: Motor disconnect requirements, switch ratings for various load types, and panelboard/switchboard overcurrent protection.
- Special Occupancies, Equipment, and Conditions: Class/Division classification, material group identification, protection techniques like explosionproof and intrinsic safety, wiring method requirements, and equipment marking interpretation.
- Renewable Energy Technologies: PV maximum voltage calculations with temperature correction, rapid shutdown system requirements, DC overcurrent protection, and arc-fault circuit protection.
All told, we've built 310 practice questions across all ten topics — enough variety that each attempt of the full practice exam feels fresh.
Study Materials for the Texas Master Electrician Exam
This is an open-book exam, so your codebook is your primary tool — but you need to know it well enough to find things fast.
Essential tools:
-
Non-Programmable Calculator — Calculations on this exam aren't complex, but they do require accuracy. This calculator features a large 8-digit display, tax and currency functions, memory keys, and a compact design that fits easily at your test station. Many PSI testing centers permit a basic calculator; confirm with the official exam bulletin.
-
Sharpie Highlighters — Your NEC codebook gets a lot of use in prep, and highlighters help you mark critical tables, definitions, and rules you return to again and again. These come in 12 assorted fluorescent colors with a narrow chisel tip — good for both underlining and margin notes.
-
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.
Spend your first week tabbing and highlighting your codebook while reading through the major articles. By test day, you want to reach Table 310.16 or Article 430 without thinking about where they are.
Exam Strategy: The Five-Wave Method
With 75 questions and 150 minutes, you can't afford to stall. Here's a battle-tested approach used by electricians who pass on the first try:
First Wave: Scan every question from start to finish. Answer only what you know instantly — 3 to 5 seconds max. Don't second-guess, don't linger. Flag everything else.
Second Wave: Return to flagged questions. Spend up to 30 seconds thinking through each one. Still no codebook yet. Memory and experience can resolve a lot here.
Third Wave: Now open the codebook. Spend no more than 1 to 2 minutes per question looking up answers. If you can't find it quickly, flag it and move on.
Fourth Wave: Dig deeper on remaining flagged questions — up to 3 to 5 minutes each. By the end of this wave, you should have 70 to 85% of the test answered. This is a good time to knock out easier texas master electrician exam calculations: conductor sizing, conduit fill, motor ampacity.
Fifth Wave: Tackle the hardest questions — residential and commercial load calculations, multi-family dwelling calculations. These are designed to take time, so saving them for last protects the rest of your score.
One more rule: Don't change an answer unless you find a specific code citation that proves you were wrong. Your first instinct is usually right.
For general prep, take the practice exam multiple times. The goal is to consistently clear 70% before test day — so that passing feels routine, not uncertain.
You're Closer Than You Think
The Texas Master Electrician license is a real career milestone — better projects, better pay, and the ability to pull your own permits. The NEC Knowledge Portion is genuinely challenging, but it's also very passable with the right prep.
Tab your codebook. Work through practice questions by topic. Run the five-wave strategy until it's automatic. And start right now — take our free practice exam and see where you stand today.