NEC 2023 vs 2026: Every Change for Your Texas Exam (2026)

Quick answer (updated September 9, 2026): The Texas journeyman and master electrician exams have been based on the 2026 NEC since September 1, 2026. Texas adopted the 2026 National Electrical Code statewide by a unanimous Texas Commission of Licensing and Regulation vote on July 28, 2026. If you are testing now, bring a soft-bound 2026 NEC — PSI will not admit a 2023 codebook. The biggest exam-relevant change is structural: load calculations moved from Article 220 to Article 120, and the dwelling general lighting load dropped from 3 VA to 2 VA per square foot. The exam format (85 questions, two portions, 70% each, open book) did not change.

If you studied on the 2023 NEC, nothing you learned is wasted — but the addresses moved and a few values changed. This guide lists every difference that matters for the Texas exam so you can update your tabs, notes, and calculation habits.

The Timeline: What Happened on September 1, 2026

On July 28, 2026, the Texas Commission of Licensing and Regulation voted unanimously to adopt the 2026 National Electrical Code as the statewide electrical code, effective September 1, 2026. Texas electrical licensing examinations switched to the 2026 NEC on that date. Texas also retained its amendment to NEC 210.8(F), keeping the GFCI exemption for certain outdoor HVAC equipment (the September 1 expiration date on that exemption was removed).

For installations, the code edition that applies depends on timing: work not requiring a permit follows the code in effect when material installation began, and permitted work generally follows the code in effect when the permit was issued. Municipalities may still adopt local amendments, so confirm with your AHJ.

What that means for your exam:

• Exam on or after September 1, 2026 (i.e. now): The exam uses the 2026 NEC. Bring a soft-bound 2026 NEC codebook. Nothing else is admitted.
• Exam before September 1, 2026: Used the 2023 NEC. If you failed a 2023-edition attempt and are retesting, your retake is on the 2026 edition — re-tab before you go back.

The Biggest Change: A New Structure

The most impactful change in the 2026 NEC is not a single rule update. It is a structural reorganization that moves content to different article numbers. This is the first phase of a larger effort to transition the NEC from its current 9-chapter format to a 20-chapter format planned for the 2029 edition.

What this means in practice: if you learned that load calculations live in Article 220, you need to relearn that they now live in Article 120 in the 2026 edition. The content is largely the same, but the addresses have changed.

Key Article Renumbering

Topic	2023 NEC Location	2026 NEC Location
Branch-Circuit, Feeder, and Service Load Calculations	Article 220	Article 120
General lighting load table	Table 220.12	Table 120.12
Demand factors for lighting	Table 220.42	Table 120.42
Electric dryer demand factors	Table 220.54	Table 120.54
Cooking equipment demand factors	Table 220.55	Table 120.55
Heating/cooling load (non-coincident)	220.60	120.60

If you have already studied extensively with the 2023 NEC, you will need to update your tabs and mental references when transitioning to the 2026 edition. The underlying calculation methods remain similar, but finding the right section quickly on exam day means knowing the new article numbers.

Load Calculation Changes

Beyond the renumbering, the 2026 NEC makes several substantive changes to how load calculations work.

Reduced General Lighting Load for Dwelling Units

One of the most significant technical changes is in Sections 120.82 and 120.84. The general lighting load power density for dwelling units has been reduced from 3 VA per square foot to 2 VA per square foot when calculating feeder and service loads. This reflects the widespread adoption of LED lighting, which draws significantly less power than the incandescent and fluorescent fixtures the old value was based on.

What this means for the exam: If you are taking the exam on the 2023 NEC, use 3 VA/sq ft for general lighting loads. If on the 2026 NEC, use 2 VA/sq ft for feeder and service calculations. This change directly affects dwelling unit load calculation problems, which are among the most common on the Calculations portion.

Continuous Load Calculation Clarification

The 2026 NEC clarifies that load calculations do not require continuous loads to be calculated at 125%. This removes a longstanding source of confusion. The 125% multiplier still applies when sizing conductors and overcurrent devices, but it is not applied during the load calculation itself.

Water Heater Demand Factors

Section 120.56 in the 2026 NEC allows demand factors to be applied to instantaneous (tankless) water heaters for feeder and service sizing. The 2023 NEC did not provide explicit demand factors for these units, which often resulted in oversized services for homes with tankless water heaters.

GFCI Protection Updates

High-Frequency GFCI Recognition

The 2026 NEC introduces an informational note in Section 210.8 that recognizes GFCIs marked "HF" or "HF+" designed for environments with high-frequency leakage currents. This addresses a growing problem in modern buildings where variable frequency drives (VFDs), LED drivers, and other electronic equipment produce high-frequency noise that can cause nuisance tripping in standard GFCIs.

While this is primarily an informational note rather than a mandatory change, it may appear on the exam as a knowledge question about GFCI types and applications.

Expanded GFCI Requirements

The 2026 NEC continues the trend of expanding GFCI protection to more locations. Review the updated list in 210.8(A) for dwelling units and 210.8(B) for other than dwelling units carefully, as the specific locations that require GFCI protection have been updated and refined.

Arc-Flash Labeling Requirements

The 2026 NEC requires more comprehensive arc-flash hazard labels on electrical equipment. The labeling requirements have been updated to align with NFPA 70E-2024 (Standard for Electrical Safety in the Workplace). A notable change is that the timestamp on arc-flash labels must now reflect the date the arc-flash risk assessment was completed, not the date the label was applied.

For the exam, know that arc-flash labeling requirements exist and understand their general purpose. You are unlikely to be asked about specific label formatting, but questions about when and where labels are required may appear.

Conductor and Wiring Method Changes

Table 310.16 Updates

While the fundamental structure of Table 310.16 remains the same, some ampacity values have been adjusted in the 2026 edition. If you are switching codebooks, do not assume the values are identical. Always reference the table in the edition you are being tested on.

Separation of High-Voltage Requirements

The 2026 NEC more clearly separates code articles addressing systems over 1000V AC and 1500V DC. While most journeyman exam questions focus on systems under these thresholds, you should be aware of the structural change if a question references high-voltage installations.

Special Occupancies and Equipment

Updated Hazardous Location Requirements

Articles 500 through 590 covering special occupancies have been revised for clarity and updated to reflect current technology. The classification system and protection methods remain fundamentally the same, but specific requirements may have been refined.

Energy Storage Systems

The 2026 NEC includes updated requirements for battery energy storage systems, reflecting the rapid growth in solar-plus-storage installations. If you work in this area, review the updated requirements in Article 706.

How to Prepare Now That the Switch Has Happened

If You Studied on the 2023 NEC

• Buy a soft-bound 2026 NEC codebook now — the exam will not admit the 2023 edition
• Re-tab it with the new article numbers (the Article 220 → 120 move is the one that costs the most time on exam day)
• Update notes and flashcards that reference 2023 article numbers
• Redo dwelling-unit load calculations using 2 VA per square foot for general lighting on feeder/service problems
• Run timed lookups so the new numbering is automatic; most people need only a few sessions
• Expect some older practice tests and study guides to still cite 2023 numbers — our question bank explanations reference the 2026 edition

If You Are Starting Fresh

• Study on the 2026 NEC from day one; there is no reason to touch the 2023 edition
• Use the free diagnostic quiz to find your weakest categories before you build a study plan
• Learn Article 120 as the load-calculation home base, and Table 310.16 values from the 2026 book only

If Your Retake Is Coming Up

• A failed 2023-edition attempt does not carry over an edition; the retake is on the 2026 NEC
• Focus first on the Calculations portion (historically the lowest pass rate), where the 2 VA change and the continuous-load clarification directly change answers

What Does NOT Change

It is easy to get overwhelmed by the changes, so here is a reminder of what stays the same:

• The exam format (2 parts: NEC Knowledge and Calculations) is unchanged
• The passing score (70% on each portion) is unchanged
• The exam is still open-book with your own codebook
• Core electrical theory and formulas are the same
• The general methodology for conductor sizing, load calculations, motor circuits, and voltage drop is the same
• Ohm's Law and power formulas are universal and edition-independent

The 2026 NEC is an evolution, not a revolution. If you understand the electrical concepts behind the code, transitioning between editions is mainly a matter of learning new addresses for familiar content.

Key Takeaways

1. Texas has tested on the 2026 NEC since September 1, 2026 — bring the 2026 codebook
2. The biggest change is structural: load calculations moved from Article 220 to Article 120
3. Dwelling unit general lighting loads dropped from 3 VA/sq ft to 2 VA/sq ft for feeder/service calculations
4. Continuous load calculation methodology has been clarified
5. GFCI requirements continue to expand
6. The core exam concepts and calculation methods remain fundamentally the same

Check your readiness for the 2026-NEC exam with our free diagnostic quiz

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Sources:

1. Texas Department of Licensing and Regulation (TDLR) - Electrician Exam Information
2. National Fire Protection Association - Exploring 2026 NEC Revisions
3. NFPA - Key Changes in the 2026 NEC
4. International Association of Electrical Inspectors (IAEI) - NEC 2026 Significant Code Changes
5. Electrical Contractor Magazine - Building the Foundation: Key Changes to Articles 90-130 of the 2026 NEC