Ok ,guys. Now something just came up . I know we are up to 51 posts
for this thread already, and I was not sure whether to continue this
one, or start a new one, but anyway:

My friend had an idea if he had gotten a generator one day, he can
utilize the A/C disconnect panel outside to backfeed into the main
panel. Of course he would shut off the main breaker and pull the A/C
disconnect when he did this.

I can put an outdoor twistlock outlet next to the A/C disconnect
panel, and put a short nipple between them an connect the wiring.

But I cannot do this with the existing 10 guage wire since it is the
old 10/2 stuff with a small ground on it. I would need to run an 8/3
with gnd ( 2 phases plus neutral).

I know this is not the right way to backfeed a panel, but regardless,
does it make sense now to run the 8/3 ?