Construction
EV Charger Circuit Calculator
Most Level 2 chargers want a 40-50A dedicated circuit. Sizing must include 125% continuous load and your existing service capacity.
Breaker size
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- Wire size (Cu)
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- Charge rate (mi/hr)
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- Service load impact
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FAQ
Why 125% continuous? +
NEC 625.41 — EV charging is always continuous load (3+ hrs typical). 32A charger = 40A breaker minimum.
Can I share a circuit? +
No — dedicated only. Some chargers offer NEMA 14-50 plug, but most code officials require hardwired for 50A+.