EV Charger Wire Sizer

Level 2 EVSE Calculator with NEC 125% Continuous Load Rule

NEC Continuous Load Rule: Circuit breaker and wire must be sized at 125% of the charger's max output.
Required Circuit Breaker
60 Amp Breaker
Recommended Copper Wire (75°C)
6 AWG
Voltage Drop: 1.2V (0.5%)

Why EV Chargers Burn Up Standard Wiring

Installing a Level 2 EVSE is one of the most sustained electrical loads a residential panel will experience, pulling continuous max power for hours.

The 125% Continuous Load Rule (NEC 625)

Our calculator automatically applies the 1.25 multiplier required by code for continuous loads.

Free 3D Printable Cable Cleats

Running heavy 6 AWG or 4 AWG cables requires robust physical support. Standard plastic staples often pinch the insulation and restrict thermal dissipation. We recommend using parametric cable cleats to secure your EV feeder lines safely.

Parametric EV Cable Cleat (Heavy Duty)

Customize the exact diameter for your specific cable brand directly in your browser. Engineered for 3D printing in PETG.

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