Is #6 NM on a 60A breaker code compliance for a Tesla 48A (continuous load) EV charger?

tortuga said:
Well if its done I see no reason to leave the 50A breaker there. Swapping a breaker to 55A would be pretty easy.
then unless I am missing something they can charge at 44A continuously.
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Actually you could just put it on a 60 amp breaker anyway.

44 amps continuous = 55 amps calculated

#6 NM is OK at 55 amps

60 amp breaker is next standard size up.
 
Birken Vogt said:
Actually you could just put it on a 60 amp breaker anyway.

44 amps continuous = 55 amps calculated

#6 NM is OK at 55 amps

60 amp breaker is next standard size up.
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duh of course thanks
tthh said:
I don't think this is one of the available settings on the Tesla charger.
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So its really a manufacturer issue or two issues
1) to squeeze every last amp out of #6 NM can Tesla just update their firmware to add a 44A charge setting for a 55A circuit? Or is it set with dip switches I wonder?
2) They need to clarify in their installation instructions that 4/2 NM cable is OK for the max setting.
 
sunbear said:
So this is sadly what ended up happening. My friend paid a lot of money to the electrician to be able to charge at the full 48A, but then the electrician skimped on the wires (#6 Romex) and then put in a 50A breaker instead of a 60A breaker. Then he limited the charger to 40A instead of 48A. So 20% of the max charging speed has been lost.

This all could have been avoided had the electrician even discussed these considerations rather than making his own choices regarding installing lower spec wire. My friend would have been happy to pay another $100 to have the 48A he had requested.
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Unless the customer drives a heck of a lot of miles, or has a very short charging window (due to varying rates, etc.) 40A will be more than fast enough. A Tesla sedan gets 3+ miles per kWh, so 40A (7KW) adds 21+ miles each hour on charge.
 
retirede said:
Unless the customer drives a heck of a lot of miles, or has a very short charging window (due to varying rates, etc.) 40A will be more than fast enough. A Tesla sedan gets 3+ miles per kWh, so 40A (7KW) adds 21+ miles each hour on charge.
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In my view, if the customer requested the capability to charge at 48A, the electrician should not pull a fast one and deliver a 40A charging solution. It's dishonest.
 
sunbear said:
In my view, if the customer requested the capability to charge at 48A, the electrician should not pull a fast one and deliver a 40A charging solution. It's dishonest.
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I don’t disagree with that, but nothing about what the customer requested, or what the EC agreed to was mentioned in your original post (#34).
 
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