I am certainly not an expert in this method. I saw this on a post awhile back, and it was stated that it had to be rigid, with no more than 6 inches of conduit run horizontally.

I do not like the idea of unprotected service entrance conductor of any chapter 3 method run inside the wall cavity. That is just my opinion.

"it is hard to teach old dogs new tricks" [Linked Image]

Pierre Belarge