EVSE Circuit and Service Load Planner
Screen a Level 2 EVSE branch circuit and its effect on an existing one-family dwelling service.
EVSE circuit details
Enter the maximum current permitted by the installed equipment setting. This tool does not verify load management.
NM-B cable ampacity is capped at 60°C.
Service load details
Include existing EVSE and other appliances; exclude HVAC below.
About this planner
Use this worksheet for one Level 2 EVSE on a one-family dwelling service. It checks the EVSE branch-circuit load against a selected conductor and breaker, then separately estimates the effect of the EVSE on the existing dwelling service load.
Enter the maximum current permitted by the installed EVSE setting and the existing dwelling connected loads. The planner uses the selected service system to derive the EVSE apparent load for the service calculation.
Method and assumptions
The branch-circuit check treats EVSE current as a continuous load and uses the selected conductor, wiring method, ambient temperature, conductor count, terminal limit, and breaker rating. NM-B ampacity is capped at the 60°C column.
The service check applies the existing-dwelling calculation to existing loads plus the EVSE apparent load derived from line voltage and maximum input current. The service result does not use the branch-circuit breaker rating as a substitute for the EVSE load.
This tool does not evaluate energy-management systems, multiple charging outlets, 100%-rated assemblies, equipment-specific exceptions, or installation approval. Verify EVSE listing instructions, required branch-circuit protection, GFCI protection, locally adopted rules, and the exact service-load method for the installation.
FAQs
Why are the circuit and service checks separate?
The branch-circuit check evaluates the EVSE current against a selected breaker and conductor. The service check adds the EVSE nameplate load to the existing dwelling load. Passing one check does not mean the other passes.
What EVSE current should I enter?
Enter the maximum input current allowed by the EVSE nameplate or a documented installed current setting. This planner does not verify that a setting is locked, listed, or controlled by a qualifying energy-management system.
Can I use this for multiple chargers or a load-management system?
No. The planner covers one EVSE and does not calculate managed or simultaneous loads. Use the equipment documentation and the applicable service-load method for those installations.
Does a passing result approve the installation?
No. It does not check GFCI protection, receptacle or equipment listing, disconnects, service equipment suitability, utility requirements, or every local rule and exception.
Sources
- NFPA 70, National Electrical Code (NEC), 2026 edition, §§625.40–625.42, §120.83, and Table 120.83.
- Confirm local adoption, EVSE nameplate and settings, equipment instructions, current errata, and local amendments.