I posted a question in the electrical forum that experienced HVAC installers may be able to help answer.
The posting is here;
https://terrylove.com/forums/showth...MCA-wire-and-breaker-size&p=411924#post411924
The posting is here;
https://terrylove.com/forums/showth...MCA-wire-and-breaker-size&p=411924#post411924