GFCI Expanded to 250V (210.8)
The most impactful change: GFCI protection now covers 125V through 250V receptacles in all GFCI-required locations. This means 240V circuits for water heaters, HVAC equipment, EV chargers, and dryer outlets now require GFCI protection.
Previously, only 125V, 15A and 20A receptacles needed GFCI. Now, a 240V, 30A dryer receptacle in a basement or garage needs GFCI protection. Dual-function (GFCI + AFCI) 30A and 50A breakers are now being manufactured to meet this demand.
Emergency Disconnect (230.85)
All one- and two-family dwelling units must have an emergency disconnect at a readily accessible outdoor location. This allows first responders (fire departments) to disconnect power without entering the building.
The disconnect must be: marked as 'Emergency Disconnect,' rated for the service, and installed at a readily accessible location on the outside of the building. Meter-main combos with an exterior main breaker satisfy this requirement.
This applies to new construction only — existing services are grandfathered unless the service is upgraded.
EV Load Management (625.42)
NEC 2023 formally recognizes EV load management systems (EVEMS) as an alternative to service upgrades. An EVEMS monitors total building load and adjusts EV charging current to prevent service overload.
This is a game-changer for residential installations: instead of costly service upgrades from 200A to 400A (often $5,000-$15,000), a $500-$1,500 load management device allows EV charger installation on existing service.
The EVEMS must be listed (UL certified) and must automatically reduce or disconnect EV charging when total demand approaches the service capacity.
Surge Protection (230.67)
All dwelling unit services must now include surge protective devices (SPD) — Type 1 or Type 2. Previously optional, SPDs are now mandatory for new residential construction.
SPDs protect against utility-side transients, lightning, and switching surges. They are installed at the main panel and are relatively inexpensive ($50-$200 for a panel-mount SPD). This change reflects the increasing prevalence of sensitive electronic equipment in homes.
Type 1: installed ahead of main overcurrent device. Type 2: installed on load side of main breaker (most common for residential panel-mount units).
Other Notable Changes
Single main disconnect for dwellings (230.71(B)): Effectively eliminates the '6-handle rule.' New one- and two-family dwellings must have a single main disconnect, not multiple grouped disconnects.
Expanded AFCI requirements: AFCI protection now required for kitchen branch circuits (previously exempted in some editions). Combined with expanded GFCI, most kitchen circuits now need dual-function breakers.
GFCI for dishwashers (422.5(A)): Dishwashers — both cord-and-plug and hardwired — now require GFCI protection. This applies to both residential and commercial dishwashers.
Outdoor GFCI for all outlets (210.8): All outdoor receptacles at dwelling units now require GFCI protection, regardless of whether they are readily accessible. Previous exemption for 'not readily accessible' outdoor outlets is eliminated.