NEC 2023 vs 2020: What Changed and What It Means for Your Exam

If you've been studying for your journeyman or master electrician exam using NEC 2020 materials — or if your exam jurisdiction recently updated to NEC 2023 — there are specific changes you need to know about. Some of them directly affect the most heavily tested topics.

This guide focuses on the changes that matter most for exam preparation: the table renaming in Article 310, expanded GFCI and AFCI requirements, EV charging updates, and the energy storage systems article. It also covers which states have adopted NEC 2023 so you can confirm which edition applies to your test.

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The Most Exam-Critical Change: Table 310.16

If you take nothing else from this article, take this: the main ampacity table changed its name.

In NEC 2020 and all prior editions, the primary conductor ampacity table was called Table 310.15(B)(16). In NEC 2023, that same table is now called Table 310.16.

The values in the table are essentially the same — the conductor ampacities for copper and aluminum at 60°C, 75°C, and 90°C did not change in a way that affects most exam questions. What changed is the table numbering and the way Article 310 is organized overall.

Why this matters on the exam: If you're using a NEC 2023 codebook and you flip to where you expect Table 310.15(B)(16) to be, you won't find it. The section 310.15 still exists (it covers general ampacity requirements), but the table itself is now Table 310.16, found within the reorganized structure of Article 310. This is the kind of navigation change that costs time on an open-book exam.

What to do: Tab Table 310.16 in your 2023 codebook the same way you would have tabbed Table 310.15(B)(16) in 2020. Practice looking it up by its new name until it's automatic.

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GFCI Requirements: 210.8

NEC 2023 Section 210.8 expanded GFCI protection requirements beyond what NEC 2020 required. These are some of the most directly tested changes on journeyman exams because they affect residential wiring decisions.

Dwelling Units (210.8(A))

The key change for dwelling units is the expansion of kitchen GFCI requirements. Under NEC 2020, GFCI protection in kitchens was required for receptacles that served countertop surfaces. Under NEC 2023, GFCI protection is required for all receptacles in kitchens — not just those serving countertops.

This is a tested distinction. An exam question that asks whether a kitchen receptacle not near a countertop requires GFCI protection has a different correct answer under NEC 2023 than it did under NEC 2020.

Other 210.8(A) expansions include:

• Bathrooms — the previous requirement for 125V, 15- and 20-ampere receptacles was expanded to cover 125V through 250V single-phase receptacles rated 150V or less to ground and 50 amperes or less. This captures common 240V bathroom heater receptacles and similar loads.
• Garages — same 125V through 250V expansion as bathrooms.
• Dishwashers — NEC 2023 added GFCI protection for dishwasher branch circuits under Section 422.5. Under NEC 2020, dishwashers were not required to have GFCI protection. This was a commonly noted gap and NEC 2023 closes it.

Commercial and Other Occupancies (210.8(B) and (C))

The commercial GFCI requirements also expanded in NEC 2023. The expansion of voltage range coverage (from 125V to 125V–250V) applies in commercial settings as well, covering more receptacle types in bathrooms, kitchens, and rooftop areas.

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AFCI Requirements: 210.12

NEC 2023 added kitchens and laundry areas to the list of rooms requiring AFCI protection in dwelling units. Under NEC 2020, these areas did not require AFCI protection.

The updated NEC 2023 Section 210.12(A) list of spaces requiring AFCI protection in dwelling units includes:

• Bedrooms (required since NEC 1999)
• Family rooms, dining rooms, living rooms, parlors, libraries, dens, sunrooms, recreation rooms, closets, hallways, laundry areas (added in NEC 2014)
• Kitchens (added in NEC 2023)
• Laundry areas (explicitly added/confirmed in NEC 2023)

The exam implication: Questions asking which areas of a dwelling unit require AFCI protection have changed between 2020 and 2023. If your exam is based on NEC 2023, kitchen circuits require AFCI breakers. If your exam is based on NEC 2020, they do not.

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Surge Protection: 230.67

NEC 2020 introduced a new requirement for surge-protective devices (SPDs) for all dwelling units — specifically requiring a Type 1 or Type 2 SPD for services supplying dwelling units. NEC 2023 maintained and refined this requirement.

For exam purposes: Know that SPDs are required at dwelling unit services under 230.67, understand the difference between Type 1 (line side of service disconnect, permanent installation) and Type 2 (load side, most common for residential panel installations), and be aware that this requirement was introduced in NEC 2020 — it did not exist in NEC 2017.

This is a favorite exam topic because it's a relatively new code requirement and tests whether you're current on editions.

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Article 625: EV Charging Equipment

Article 625 (Electric Vehicle Charging Systems) was significantly revised in NEC 2023 to address the rapid expansion of EV infrastructure. The 2023 edition reorganized the article and added new provisions for:

• Bidirectional charging — EV charging equipment capable of returning power from the vehicle to the building or grid
• Outlet devices — New defined category covering simpler EV charging connections
• Load management — Requirements for systems that manage charging load to prevent panel overloads
• Supply equipment ratings — Updated ampacity and rating requirements for EV supply equipment (EVSE)

For journeyman exams, the most testable aspects of Article 625 remain the basic wiring method and circuit requirements for EV supply equipment. Master exam candidates should also be familiar with the load calculation implications of EV charging loads and how they're handled under Article 220.

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Article 706: Energy Storage Systems

Article 706 (Energy Storage Systems) exists in both NEC 2020 and NEC 2023, but the 2023 edition expanded the coverage significantly to address battery storage systems in residential, commercial, and industrial settings.

Key exam points for Article 706:

• Energy storage systems include battery systems, flow batteries, capacitors, and flywheel systems
• Disconnecting means requirements differ from standard service disconnects
• The article works in conjunction with Article 705 (Interconnected Electric Power Production Sources) for grid-tied installations
• Battery system ratings and installation clearances are specifically addressed

Energy storage and solar-related questions are appearing more frequently on both journeyman and master exams as these systems become standard residential installations. Tab Article 706 in your 2023 codebook.

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What Did NOT Change Between 2020 and 2023

Understanding what stayed the same is as important as knowing what changed. The following heavily tested topics did not change significantly between NEC 2020 and NEC 2023:

The fundamentals of load calculations, wire sizing, overcurrent protection, and grounding/bonding are stable across editions. If you know these cold, edition-specific changes are a smaller lift.

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State Adoption: Which Edition Applies to Your Exam?

NEC editions are adopted by states independently, and there's always a lag between NFPA publishing a new edition and states adopting it for their licensing exams. As of 2026, the adoption landscape looks like this:

Critical: Do not rely on any table, including this one, to confirm which edition applies to your exam. State adoption changes annually and mid-cycle updates happen. Always verify directly with your state licensing board before registering for your exam.

For state-specific details, see our state-by-state electrician license guide or search for your specific state.

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Exam Strategy for Edition Transitions

If your state recently switched from NEC 2020 to NEC 2023 for licensing exams, here's a focused approach:

1. Get the right codebook. Make sure your tabbed NEC is the 2023 edition, not 2020. The table renaming alone will cause missed questions if you're using the wrong codebook on exam day.

2. Re-tab Article 310. The table numbering change means your old tabs pointing to "310.15(B)(16)" are wrong. Re-tab and label Table 310.16 explicitly.

3. Update your GFCI knowledge. Review 210.8(A) under NEC 2023 specifically. Know that kitchen receptacles, not just countertop ones, now require GFCI. Know the 125V–250V expansion for bathrooms and garages.

4. Learn the AFCI additions. Kitchen and laundry circuits are new AFCI territory in 2023. Add these to your mental list.

5. Tab 230.67. Surge protection for dwelling units is a 2020+ requirement that continues in 2023. Know it's required and know the difference between Type 1 and Type 2 SPDs.

6. Don't re-learn everything else. The calculation methods, table values, and grounding/bonding requirements are stable. Edition-specific prep is a focused supplement, not a complete restart.

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The Edition That Matters Is the One on Your Exam

The goal isn't to know every change in NEC 2023 — it's to be fast and accurate on the edition your state requires for your exam. If that's 2023, the changes above are your study list. If it's still 2020, your existing prep materials are fine.

Either way, the exam tests the same core competencies: wire sizing, load calculations, GFCI/AFCI placement, grounding and bonding, and conduit fill. The edition affects specific table names and threshold locations — the underlying skills are the same.

GetLicenseReady has 1,600+ NEC 2023-aligned practice questions in exam mode — 100 questions, timed, open-book format. Start with 25 free questions and no account required.

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NEC editions are adopted by individual states on their own schedules. Always verify the edition your state requires for its licensing exam directly with your state licensing board before you register and before you purchase study materials.

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Related Guides

• Grounding vs Bonding (NEC 250) — Stop Getting This Wrong — The most-tested Article 250 topics with exact section citations
• NEC 314.16 Box Fill Calculations for the Electrician Exam — A stable, heavily tested topic that hasn't changed between editions
• GFCI and AFCI Requirements: NEC 210.8 and 210.12 Explained — Deep dive on the two articles most affected by the 2020→2023 transition
• How to Pass the Electrician Exam: 6 NEC Articles That Cover 60% — High-leverage prep strategy regardless of which edition you're testing on
• What's Actually on the Electrician License Test? — State-by-state breakdown of exam format, question count, and passing scores