Stormin Mormon wrote:
Also, copper versus aluminum makes a difference. I don't have a spec sheet,
but alum takes a lower number. Which is a physically larger wire.



He needs ampacity of 85A rather than 68.5 because it's a continuous
resistive load. #3 Aluminum type SE cable will work if the breaker and
terminals are rated for 90°C. Otherwise, he needs #4 copper rated for
75°C or better.

Best regards,
Bob