Circuits are not intended to run continuously at more than 80% of rated amps. For a 40 amp circuit this is 32 amps.
Will the charger regularly draw 32 amps or more?
You also have to derate the wire for the higher temperature found in up near the roof.
So now what you thought was a 40 amp circuit becomes more like 30 amps or less.
This is important because fixed wiring causes about 70% of fires in residential structures.
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