Question about hookup of electric furnace
I recently purchased a new place and it was cold outside when I moved in so I ran the heat for about a week before it got warm and it was no longer needed. This electric furnace runs off of 2x 60 amp breakers. One of these breakers tripped several times while I was using it and I decided to turn them both to the off position and deal with this problem as a summer project.
Now that is it hot outside and I am using the AC, I decided to tear into this project while doing some other basic wiring. Well, I opened the breaker box and removed the breaker for the suspect circuit only to find that the two hot wires were not clamped down by the two screws that attach them to the breaker. The breaker came completely out in my hand and was basically not attached. I noticed that the copper wiring was discolored from the arcing and the insulation on the white wire was turning brown from the heat so I assume this is why this breaker was tripping. I replaced the breaker and screwed it down correctly this time. I also checked the others and they were all tight.
I have two questions now. 1) Is there any damage this could have done? Is the wiring or any part of the furnace suspect from this error? 2) The wire is 6-2 with ground. The ground is much smaller and is probably a #12 or #10 at largest. The ground appears to be run as the neutral and this concerns me. I am not an expert at this and it may be ok but the problem with the breaker installation makes me concerned that the person who hooked this up wasn't doing things by the book. Is this ok?