NEC Article 625 outlines the requirements for the installation and use of electric vehicle (EV) charging and supply equipment, addressing both safety and efficiency. Here is a comprehensive overview of the key sections within this article:

625.1 Scope

This section covers the installation of equipment and wiring used to charge electric vehicles, as well as systems for exporting or transferring power from EVs to premises wiring.

625.2 Definitions

Defines essential terms such as “Electric Vehicle,” “Wireless Power Transfer,” and “Primary Pad,” ensuring clarity in the installation and operation of EV charging systems.

625.5 Listed or Labeled Equipment

All electrical materials, devices, fittings, and associated equipment must be listed or labeled for the specific application, ensuring they meet safety standards.

625.9 Wiring Methods

Specifies the acceptable wiring methods for connecting EV charging equipment. This includes guidelines for the installation of conductors, grounding, and bonding to ensure safe operation.

625.17 Electric Vehicle Coupler

Details the requirements for the EV coupler, which must comply with specific standards to ensure safe and effective connection between the EV and the charging equipment.

625.41 Rating

EV supply equipment is considered a continuous load, and the overcurrent protection device (OCPD) must have a rating of at least 125% of the maximum load of the EV supply equipment. This ensures the system can handle prolonged use without overheating.

625.42 Electric Vehicle Branch Circuit

Each outlet for EV supply equipment must be supplied by an individual branch circuit. Exceptions are allowed for multiple EVSEs if they comply with specific conditions outlined in 625.42(A) or (B).

625.43 Disconnecting Means

For EV chargers rated at 60A or larger, or more than 150V to ground, a readily accessible disconnecting means must be installed. This device must be capable of being locked in the open position to ensure safety during maintenance or emergencies.

625.46 Backfeed Prevention

A means to prevent backfeed to the utility in the event of a power loss must be included in the EV charging system. This is typically part of the charger kit and must be properly connected.

625.50 Indoor and Outdoor Installations

• Indoor Installations: Must meet minimum ventilation requirements as specified in Tables 625.52(B)(1)(a) and 625.52(B)(1)(b).
• Outdoor Installations: The coupling means must be stored or located at a height between 2 and 4 feet above the parking surface to ensure accessibility and safety.

625.54 Ground-Fault Circuit-Interrupter (GFCI) Protection

All single-phase receptacles installed for EV charging, rated at 150 volts to ground or less, and 50 amperes or less, must have GFCI protection to ensure personnel safety.

625.56 Receptacle Enclosures

Receptacles installed in wet locations for EV charging must have enclosures that are weatherproof when the attachment plug cap is inserted or removed, ensuring protection against environmental factors.

625.60 Power Transfer Systems

Covers the requirements for power transfer systems, including the ability for bidirectional power flow and the use of equipment in island mode, allowing EVs to provide power to premises wiring during outages.

For further details and specific requirements, consulting the NEC Handbook and additional resources provided by the NFPA is highly recommended. More insights can be found on resources like Electrical License Renewal and Codebook City.