went to a mobile home and found the following;

80 amp main panel breaker feeding 2 60 amp unit switches(breakers).

Electric strip heat- 4 elements and blower, so 85+ with all on.

wire comes into unit's bottom switch and then jumper wires feed the upper 60 amp switch.

1) bottom unit switch is overheating and tripping, why? I questioned if the total amp draw was going through that switch since the feed came into the back/incoming side and then split off. Sparky said no.

2) is the jumper set up okay? usually there is a buss bar or factory metal and plastic splitter to do this.

sent our sparky out there and he determined the wire size could only support 80 amp load.

I had left 4th element disconnected, so only 65+ amps on the 80 amp panel breaker. unit's top switch had 2 elements and fan, bottom now has only 1 element.