Study guides · Code updates

NEC 2023 vs. 2020: What Changed for Your Exam

By Mason Garry, Master Electrician · Updated September 28, 2026 · 8 min read

Code-cycle changes are exam gold: test writers love asking about what's new, because it separates people studying the current book from people coasting on the old one. If your state tests on the 2023 NEC, these are the changes most likely to show up. (Check which edition your state uses.)

GFCI Expansion — 210.8

GFCI protection grew in three directions:

• 210.8(A) & (B) — kitchens: GFCI protection now covers all receptacles in the kitchen — not just the ones serving countertops.
• 210.8(D) — specific appliances: the requirement extends to electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and microwave ovens.
• 210.8(F) — outdoors: coverage extends to outdoor outlets, including hardwired (non-cord-and-plug) equipment.

Exam angle: "which of these requires GFCI?" questions got harder — the old short list (bathrooms, garages, outdoors, countertops…) grew. Know the expansions.

Surge Protection — 230.67, 215 & 225

The dwelling-unit surge-protective-device requirement now covers dormitory units, hotel/motel guest rooms and suites, and nursing-home / limited-care patient sleeping rooms — not just dwelling units. New surge requirements were also placed in Article 215 (feeders) and Article 225 (outdoor branch circuits and feeders), with a new minimum nominal discharge current rating (I_n) of 10 kA.

Exam angle: "where is an SPD required?" now has more right answers than the 2020 book allowed.

Emergency & Service Disconnects — 225.41 & 230.71(B)

• 225.41 (new): the emergency disconnect rule — previously only in 230.85 for service-supplied dwellings — now applies to one- and two-family dwellings supplied by feeders. Firefighters get a shutoff regardless of how the dwelling is fed.
• 230.71(B): the two-to-six service disconnect rules were clarified — barrier requirements between vertical sections (see 230.62), transfer switches in a separate compartment from the service disconnect, and new counting rules for metering-center and motor-control-center disconnects among the permitted six.

Exam angle: the feeder-supplied dwelling disconnect is brand new — prime test material.

Island, Peninsula & Drawer Receptacles — 210.52(C)

Receptacles are no longer required on kitchen islands and peninsulas — but provisions for a future receptacle must be provided. Receptacles installed in drawers are permitted but do not count as a required receptacle.

Exam angle: the classic "how many receptacles on this island?" question now has a different answer. Watch for the drawer-receptacle trap.

Neutrals at Switches — 404.2(C)

A grounded (neutral) conductor is required at switch locations controlling lighting loads — and the old allowance for installations where additional cable could be fished in later was removed.

Exam angle: "is a neutral required at this switch location?" — the answer is now yes, with fewer exceptions.

Barriers — 215.15 & 230.62(C)

• 215.15 (new): panelboards, switchboards, switchgear, and motor control centers supplied by transformer secondaries or feeder taps must have barriers so no energized, uninsulated, ungrounded busbar or terminal is exposed to contact while servicing load terminations.
• 230.62(C): revised to make clear that barriers must prevent inadvertent contact with uninsulated, ungrounded service busbars and terminals when the disconnecting means is open.

Service-Entrance Wiring — 230.43 & New Article 371

Type TC-ER cable is now identified for use as service conductors, and flexible bus systems (covered by new Article 371) were added as a permitted service-conductor wiring method.

Drill the Changes

New-code questions are lookup questions — the perfect Sparky rep. Tab 210.8, 230.67, and 225.41, then drill them with the book open.