Conductor Sizing limits with an L6-30r.

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I'm having a car charger installed that requires a 30 amp circuit. I want to upsize the conductors for future. Is there an L6-30r that accepts #6? I've only seen #8. My 30 amp cb does accept #6 so I'd like to maximize the circuit for a possible future charger upgrade.

If not, I'll go with #8.

Don
 
You can pigtail a smaller size wire at the start and end of the run to terminate on your device and breaker.

Thanks. Since the charger is actually in the car and is what determines the maximum power draw, can I install a beefier EVSE that calls for a 40 amp breaker but instead use the 30 amp breaker that is already in my panel since the car will only draw about 15 amps?
 
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