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Wire Gauge, Breaker Size

Information about the power supply (wiring, circuit) requirements needed to install an EV Charger.

Updated over a week ago

While this article provides guidance on hardware requirements for EV Charger installation, we always recommend consulting a licensed electrician. Selecting the appropriate wire gauge and breaker size is crucial for safety and optimal performance.

Wiring Requirements:

  • 6 AWG copper wire (required for all installations)

  • Rated for 90C or higher

  • Must be copper, not aluminum

  • Rated for 125% of maximum charge rate (per NEC Article 310)

Breaker Size:

  • 30A-60A range, based on configuration and desired charge rate

  • 40A breaker for 30A charge rate

  • 60A breaker for 48A charge rate (requires hardwiring)

  • NEC requires 25% margin above expected load

Important Notes:

  • Wire terminals in the EV Charger accommodate up to 6 AWG wire

  • Larger gauge (4 AWG) won't fit properly and creates safety hazards

  • Smaller gauges than 6 AWG may not safely handle the required current

  • Longer wire runs may require adjustments to prevent voltage drop

  • Copper wire is mandatory due to superior conductivity and reliability

  • For guidance on THHN vs. Romex/NM wiring, consult a professional electrician

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At Emporia Energy, our goal is to provide comprehensive and clear information to help you manage your energy more effectively. If you found this article lacking or have suggestions for improvement, please reach out to our customer support team. We are committed to continually enhancing our guides to better serve you.

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