Every three years, the National Fire Protection Association (NFPA) releases an updated edition of NFPA 70, the National Electrical Code (NEC). The 2023 edition brings meaningful changes from the 2020 cycle that affect how electricians, contractors, and inspectors approach residential, commercial, and industrial work. Here's a clear side-by-side breakdown of the most important differences.
1. Surge Protection Devices (SPDs)
| NEC 2020 | NEC 2023 |
|---|---|
| SPDs recommended but not required in dwelling units | SPDs now required in all new dwelling unit service equipment (panels) |
This is one of the biggest changes in the 2023 edition. Every new residential electrical panel must now include a surge protective device, protecting appliances and electronics from damaging voltage spikes.
2. GFCI Protection
| NEC 2020 | NEC 2023 |
|---|---|
| GFCI required in kitchens, bathrooms, garages, outdoors, crawl spaces, unfinished basements, and boathouses | Expanded to include indoor damp/wet locations and additional areas previously exempt |
The 2023 NEC continues the trend of expanding GFCI coverage to more locations, reducing shock hazards in areas that were previously overlooked.
3. AFCI Protection
| NEC 2020 | NEC 2023 |
|---|---|
| AFCI required in most habitable rooms of dwelling units | Refined requirements with clarified exceptions for certain wiring methods and locations |
The 2023 edition clarifies some of the ambiguities around AFCI requirements, making it easier for inspectors and contractors to determine when protection is and isn't required.
4. EV Charging (Electric Vehicles)
| NEC 2020 | NEC 2023 |
|---|---|
| Basic EV outlet requirements; limited EV-ready provisions | New EV-ready and EV-capable requirements for new construction; updated load calculation rules for EV charging |
The 2023 NEC introduces a tiered approach to EV infrastructure: EV-capable (conduit only), EV-ready (wired circuit), and EVSE-installed (charger in place). This affects new residential and commercial construction significantly.
5. Energy Storage Systems (ESS)
| NEC 2020 | NEC 2023 |
|---|---|
| Article 706 introduced for ESS; general installation requirements | Expanded Article 706 with more detailed requirements for location, ventilation, disconnecting means, and labeling |
As home battery systems like Tesla Powerwall become more common, the 2023 NEC provides clearer guidance for safe installation and inspection.
6. Solar PV — Rapid Shutdown
| NEC 2020 | NEC 2023 |
|---|---|
| Rapid shutdown required within the array boundary | Refined requirements with updated module-level power electronics (MLPE) provisions and clarified boundaries |
Article 690 updates in 2023 improve first-responder safety during fires by clarifying exactly how and where rapid shutdown must be implemented on PV systems.
7. Receptacle Outlet Spacing
| NEC 2020 | NEC 2023 |
|---|---|
| Standard spacing rules for dwelling units | Updated provisions for outdoor receptacles and clarified rules for kitchen countertop outlets |
Which Edition Should You Be Using?
NEC adoption is handled at the state and local level, so the edition that applies to your work depends on your jurisdiction. As of 2026, many states have adopted the 2023 NEC, while others are still on 2020 or even 2017. Always confirm with your local Authority Having Jurisdiction (AHJ) before starting a project.
Get the NEC 2023 Handbook
The annotated NEC Handbook includes NFPA's official commentary alongside each code section — invaluable for understanding the intent behind the changes. Shop our full NEC 2023 selection:
