Why the Texas Master Electrician Exam Uses the 2023 NEC — Not the 2026 Edition

If you recently picked up the shiny new 2026 NEC code book, you might be in for a surprise: you cannot bring it into the Texas Master Electrician exam. Texas currently tests on the 2023 NEC, and that is the only edition allowed in the exam room.

This is one of the most common — and costly — mistakes exam candidates make. Let's break down exactly why this matters, what changed between editions, and what you need to do before exam day.

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How Texas Adopts the NEC

The National Electrical Code (NEC) is published by the National Fire Protection Association (NFPA) every three years. The 2026 edition was released in early 2026. However, states do not automatically adopt each new edition — they go through their own legislative and regulatory process before switching.

Texas adopts the NEC through the Texas Department of Licensing and Regulation (TDLR). The adoption process involves rulemaking, public comment periods, and legislative approval, which typically takes one to three years after NFPA publishes a new edition.

As of 2026, Texas has not adopted the 2026 NEC. The exam administered by TDLR for the Master Electrician license is based on the 2023 NEC, and that will remain the case until TDLR officially announces a transition date.

Bottom line: The Texas Master Electrician exam tests the 2023 NEC. Bring the 2023 NEC book to the exam — not the 2026.

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What Changed in the 2026 NEC That Makes This Confusing

The 2026 NEC introduced the largest structural reorganization in decades. If you have been studying with a 2026 book, some of what you learned may not match what the exam expects — and some familiar section numbers simply will not exist in your 2023 book.

Here are the most significant changes that affect exam candidates:

Article 220 Became Article 120

The entire load calculation article was renumbered. In the 2023 NEC, load calculations live in Article 220. In the 2026 NEC, that same content moved to Article 120.

If you flip to "Table 220.55" in a 2026 NEC book, it will not be there. That table — the one covering demand factors for household electric ranges — is now Table 120.55 in the 2026 edition. On the exam, you will be expected to find Table 220.55 in the 2023 NEC.

The Lighting Load per Square Foot Changed

One of the most impactful calculation changes is the general lighting load for dwelling units:

• 2023 NEC (Table 220.12): 3 VA per square foot
• 2026 NEC (Section 120.41): 2 VA per square foot

That is a 33% reduction. If you memorized 2 VA/sq ft from your 2026 book, you will get load calculation questions wrong on the exam. The correct answer for the Texas exam is 3 VA per square foot.

The Optional Method First Tier Changed

The optional calculation method for dwelling units also changed:

• 2023 NEC (Section 220.82): First 10 kVA at 100%, remainder at 40%
• 2026 NEC (Section 120.82): First 8 kVA at 100%, remainder at 40%

Again, if you studied from the 2026 book, you may have memorized the wrong threshold.

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What You Should Do Before the Exam

1. Get a 2023 NEC Book

You need a physical copy of the 2023 NEC to bring into the exam room. TDLR allows you to tab and highlight it, but no handwritten notes inside the book. You do not need a brand-new copy — a used 2023 NEC from eBay or Amazon typically costs $30 to $60, which is far less than the cost of a retake.

If you already own the 2026 edition, keep it — it will be valuable on the job site once Texas eventually adopts it. But for the exam, you need the 2023.

2. Tab Your 2023 Book Correctly

Knowing where to find things quickly is just as important as knowing the answers. The exam allows 3 minutes per question, and fumbling through an untabbed book will cost you. Check out our guide on how to tab your NEC codebook for the Master Electrician exam for a complete two-tier tabbing system built specifically for the Texas exam.

3. Study the 2023 Sections — Not the 2026 Numbers

When you practice load calculations, use the 2023 section numbers:

• General lighting: Table 220.12 (3 VA/sq ft for dwellings)
• Demand factors: Table 220.42
• Ranges and ovens: Table 220.55
• Dryers: Table 220.54
• Optional method: Section 220.82 (first 10 kVA at 100%)

All of the practice questions on this site reference the 2023 NEC — the same edition tested on the Texas exam.

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When Will Texas Switch to the 2026 NEC?

There is no official announcement from TDLR yet. Based on historical adoption patterns, Texas typically adopts a new NEC edition one to three years after it is published. The 2026 NEC was released in early 2026, so a reasonable estimate would be sometime between 2027 and 2029 — but that is speculation until TDLR makes an official announcement.

When Texas does adopt the 2026 NEC, the exam will change to reflect the new article numbering, and the allowed reference book in the exam room will switch to the 2026 edition. We will update this site as soon as TDLR makes that announcement.

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The Practical Takeaway

Your 2026 NEC book is not wasted — it is the future of the code and will serve you well on the job. But for the Texas Master Electrician exam right now, you need the 2023 NEC. The section numbers are different, some demand factors are different, and bringing the wrong book to the exam room means you cannot use it.

Get a used 2023 NEC, tab it well, and study the right edition. That is one less variable standing between you and your license.

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All practice questions on this site are written to the 2023 NEC. If you spot any discrepancy or have a question about a specific code section, use the Support page to reach out.