Edit: figured out the vid link. Our cold step apprentice asked me about backfeed today after I was talking about having someone blow up a set of our grounds in Oregon last winter when they turned on their generator. It got me thinking, I dont think I have ever heard anyone explain the WHY you need to have a transfer switch in between your house and your service drop. Also no, just flipping your breakers is not sufficient. This was 100% off the top of my head and Ive been known to get into the weeds without knowing it.