A Level 2 charger is a permanent electrical installation. Most problems with it, from nuisance trips to failed inspections, trace back to planning. Work through these steps before buying hardware.

1. Confirm electrical capacity

A licensed electrician should perform a load calculation on the existing service. Charging is a continuous load under the National Electrical Code, so the circuit must be rated at 125 percent of the charger’s output: a 48-amp charger needs a 60-amp circuit.

If the service cannot support the load, the options are, roughly in order of cost:

  1. A lower charger setting (most units can be configured for less current).
  2. A load management system, which shares or throttles capacity across chargers or household loads. The NEC permits sizing on managed load when the system is listed for that purpose.
  3. A service upgrade, which involves the utility and can take months at commercial sites.

2. Pick listed equipment

Use EVSE listed by a nationally recognized testing laboratory, typically to UL 2594 for AC equipment. Listing is how the inspector knows the equipment is safe. Unlisted equipment, including many inexpensive online imports, can fail inspection and void insurance coverage.

For commercial sites, also confirm:

  • Networking. OCPP support, so you are not locked into one network provider.
  • Cable management and cable length that reaches every space it serves.
  • Environment. An enclosure rating suited to outdoor or washdown locations.

3. Pull permits

Nearly every jurisdiction requires an electrical permit for a hardwired charger or a new 240-volt circuit. Article 625 of the NEC covers EV charging equipment specifically. Your local jurisdiction adopts a specific NEC edition, sometimes with amendments, so the electrician and inspector work from that edition.

4. Plan the site (commercial)

  • Accessibility. Public sites need accessible charging spaces. The U.S. Access Board’s technical assistance document sets out design recommendations, and many states have their own requirements.
  • Signage and pricing. Many states regulate how public charging is priced and displayed. Selling electricity by the kilowatt-hour falls under weights-and-measures rules based on NIST Handbook 44.
  • Lighting, protection and trenching. Bollards, wheel stops and conduit runs often cost more than the charger.

5. Hire qualified installers

Use a licensed electrical contractor. For publicly funded projects, federal minimum standards require electricians certified through the Electric Vehicle Infrastructure Training Program (EVITP) or a registered apprenticeship program, and many state and utility programs require the same. See our regulatory overview.

6. Plan for maintenance

A charger is a field asset with moving parts, connectors that wear and firmware that needs updates. Decide who maintains it before you install it. See charger reliability and uptime.