Field reference for EV charging technicians. 8 entries, taken from the PlugWatt app.
Reference notes from PlugWatt, the offline field toolkit for electric vehicle charging installation and service technicians. It works with no cell signal, because the sites do not have any.
Get PlugWatt on the App StoreInstallation rules for EVSE: branch circuits, feeders, disconnects, ventilation, and energy management.
625.41 and 625.42: EV charging is a continuous load; size conductors and overcurrent devices at 125 percent of the equipment rated current
625.42 permits sizing to a lower setting when an energy management system limits the load; the 2026 cycle expands this with 625.48 managed maximum demand
625.43: fixed EVSE rated over 60 A or over 150 V to ground requires a readily accessible, lockable disconnecting means
625.54: receptacle installations for EV charging require GFCI protection
Coordinate with 110.14 termination temperature limits and Article 310 ampacity tables
Product safety standard for DC charging equipment: construction, temperature limits, abnormal operation, and output safety.
Covers the DC charger as a listed product; field modifications void the listing
Temperature and abnormal condition testing back the interlocks techs must never defeat
Pairs with UL 2231 for the personnel protection system requirements
Requirements for the charging circuit interrupting devices and isolation monitoring that protect people from shock.
Defines CCID leakage trip behavior for AC supply equipment
Defines isolation monitoring expectations for isolated DC systems
Commissioning should verify the trip test per the manufacturer procedure and record it
The North American AC coupler and the control pilot signaling every session begins with.
Defines pilot states A through F and the duty cycle to available current mapping
Defines the proximity circuit and latch behavior
The CCS combo coupler builds on this physical and signaling base
International system standard defining charging modes 1 through 4 and control functions.
Mode 2: portable EVSE with in cable protection; Mode 3: dedicated AC EVSE; Mode 4: DC charging with off board rectification
Defines control pilot functions internationally, aligned with J1772 signaling
Referenced by most global charger type approvals
High level communication between vehicle and charger: session negotiation, Plug and Charge with certificates, and vehicle to grid services.
Plug and Charge authenticates the vehicle with an installed certificate so no card or app is needed
Certificate chains involve the vehicle OEM, the mobility operator, and the charge point operator; expiry or a broken chain blocks automatic authorization
Edition 20 adds bidirectional power transfer support
The charger to backend protocol: registration, authorization, transactions, telemetry, firmware, and smart charging.
1.6J is the deployed workhorse; 2.0.1 adds device management, security profiles, native ISO 15118 support, and richer smart charging; 2.1 is emerging
A charger and backend must agree on version and profile; mismatches present as boot loops or silent feature gaps
Offline behavior, cached authorization lists, and local whitelists are operator policy choices within the protocol
Shock and arc flash risk assessment, energized work permits, lockout tagout, and PPE selection.
Requires an arc flash risk assessment; DC systems over 100 V need shock and arc flash analysis
DC arcs have no current zero crossing, so they sustain rather than self extinguish; lower peak but longer duration than comparable AC events
Energized work requires justification and an Energized Electrical Work Permit
Verification of absence of voltage is a step of lockout, not an afterthought
Reference notes from PlugWatt, the offline field toolkit for electric vehicle charging installation and service technicians. It works with no cell signal, because the sites do not have any.
Get PlugWatt on the App StoreThese notes are a field aid, not a substitute for the governing codes, the stamped drawings, the authority having jurisdiction, or manufacturer manuals. Verify against the current documentation for your installed equipment.