NEC Article 625 Compliance for EV Chargers in Ohio

NEC Article 625 is the primary electrical code section governing electric vehicle charging system installations across the United States, including all Ohio residential, commercial, and multifamily projects. This page covers the scope of Article 625, how its requirements translate into physical installation decisions, which scenarios trigger specific provisions, and where compliance boundaries require licensed electrician involvement. Understanding this article is foundational to any Ohio EV charger installation codes and standards review.

Definition and scope

National Electrical Code (NEC) Article 625, published by the National Fire Protection Association (NFPA), establishes the installation requirements for electric vehicle power transfer systems — the equipment and circuits that supply power from a building's electrical infrastructure to a vehicle's onboard charger or battery. The article covers EVSE (Electric Vehicle Supply Equipment), the conductors connecting EVSE to the electrical supply, the branch circuits and feeders serving those conductors, and the control and communications interfaces.

The 2023 edition of the NEC, published by NFPA effective January 1, 2023, is the current edition of NFPA 70. Ohio formally adopts the NEC through the Ohio Board of Building Standards (BBS) as the state's referenced construction code. Jurisdictions within Ohio may be enforcing either the 2020 or 2023 edition depending on local adoption status, and some municipalities, including the City of Columbus and Cuyahoga County, may have locally adopted amendments that interact with Article 625 provisions. The regulatory context for Ohio electrical systems page details the state-level adoption hierarchy.

Article 625 does not cover:

How it works

Article 625 structures its requirements across four functional areas: equipment listing, circuit sizing, installation methods, and disconnecting means.

1. Equipment Listing
All EVSE installed in Ohio must be listed by a Nationally Recognized Testing Laboratory (NRTL) — for example, UL (Underwriters Laboratories) listing under UL 2594 for Level 1 and Level 2 equipment. Unlisted equipment cannot be approved by Ohio inspectors regardless of manufacturer claims.

2. Circuit Sizing
NEC 625.41 requires that branch circuits supplying EVSE be rated at no less than 125% of the EVSE's continuous load rating. A Level 2 charger drawing 32 amperes continuously, for instance, requires a branch circuit rated at a minimum of 40 amperes (32 A × 1.25 = 40 A). This interacts directly with dedicated circuit requirements for EV charging in Ohio.

3. Installation Methods
Wiring methods must comply with NEC Chapter 3 as modified by Article 625. Outdoor EVSE installations require weatherproof enclosures and, where installed in areas subject to physical damage, conduit protection. Electrical conduit and wiring methods for EV chargers in Ohio expands on approved raceway types under Ohio's adopted code.

4. Disconnecting Means
NEC 625.43 mandates a readily accessible disconnecting means for each EVSE, rated for the load and lockable in the open position where required by the authority having jurisdiction (AHJ). In Ohio, the AHJ is typically the local building department or fire marshal.

5. GFCI Protection
NEC 625.54 requires ground-fault circuit-interrupter (GFCI) protection for all 120-volt and 240-volt, single-phase, 15- and 20-ampere receptacles used for EV charging in dwelling unit garages. Hardwired EVSE at 240 volts over 20 amperes is not required to be GFCI-protected under Article 625 itself, though local amendments may impose additional requirements. See GFCI protection for EV charging equipment in Ohio for the full framework.

For a broader view of how Article 625 fits within Ohio's electrical system architecture, the conceptual overview of Ohio electrical systems provides system-level context.

Common scenarios

Residential garage installation (Level 2, 240 V / 40 A circuit)
The most common Ohio residential scenario involves a 7.2 kW wall-mounted EVSE connected to a 40-ampere, 240-volt branch circuit. Article 625.41's 125% rule is satisfied by the 40 A circuit serving a 32 A continuous load. The installation must be permitted through the local building department, inspected, and the EVSE must carry a listed mark.

Commercial parking facility (multiple Level 2 stations)
In a commercial parking structure, NEC 625.42 permits load management systems to be used, allowing the total connected EVSE load to exceed the available service capacity provided that no single charger simultaneously draws more than its rated amperage. This provision is central to smart load management for EV charging in Ohio. The home page of this authority site provides entry points to both residential and commercial installation frameworks.

DC Fast Charger (Level 3, three-phase)
DC fast chargers operating at 480 volts, three-phase are covered under Article 625 but interact with additional NEC articles governing over 1,000-volt installations and feeder sizing. Ohio inspectors typically require engineered drawings for DC fast charger installations. DC fast charger electrical infrastructure in Ohio addresses the infrastructure requirements in detail.

Level 1 vs. Level 2 comparison
Level 1 EVSE (120 V, 12–16 A) uses a standard NEMA 5-15 or 5-20 receptacle and is subject to GFCI requirements under NEC 210.8 as well as Article 625. Level 2 EVSE (208–240 V) requires a dedicated circuit, a listed EVSE unit, and a specific disconnecting means — a distinct set of compliance obligations compared to Level 1 plug-in use.

Decision boundaries

Article 625 compliance is non-optional for any fixed EVSE installation in Ohio. The following boundaries define where specific provisions apply:

  1. Permit required: Any new branch circuit for EVSE requires an electrical permit from the local AHJ in Ohio, per Ohio Revised Code Chapter 3781 and the Ohio Building Code. Permit-exempt situations (portable Level 1 use of an existing outlet) do not involve fixed wiring and fall outside Article 625's scope.

  2. Licensed electrician threshold: Ohio law, under ORC 4740, requires a licensed electrical contractor to pull permits and perform wiring on new circuits. Homeowner self-installation exemptions are limited and do not extend to new 240-volt circuits in most Ohio municipalities.

  3. Load calculation trigger: When EVSE addition causes calculated demand load to exceed the existing service rating, a service upgrade is required before EVSE installation. Load calculation for EV charging installations in Ohio and electrical panel upgrades for EV chargers in Ohio cover the assessment process.

  4. Outdoor vs. indoor installation: Outdoor EVSE requires weatherproof-rated equipment (NEMA 3R minimum) and may require additional conduit protection not required for indoor garage installations.

  5. Multifamily scope boundary: Multifamily buildings with 5 or more units fall under Ohio's commercial code pathway, not residential, changing which inspection authority applies. Multifamily EV charging electrical systems in Ohio addresses this split.

Scope and coverage limitations

This page covers NEC Article 625 as adopted and enforced within the State of Ohio under the Ohio Building Code and local AHJ authority. It does not address federal EVSE standards applied to interstate commerce, OSHA electrical safety standards for workplace installations (though those apply separately), or the internal standards of Ohio utilities regarding service entrance upgrades. Requirements in neighboring states (Indiana, Kentucky, Michigan, Pennsylvania, West Virginia) operate under their own NEC adoption cycles and are not covered here. Installations on federal property within Ohio (military bases, federal facilities) may follow a separate code adoption schedule administered by the relevant federal agency.

References

📜 8 regulatory citations referenced  ·  ✅ Citations verified Feb 25, 2026  ·  View update log

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