I am interested in wiring a generator to my home via transfer switch. It is a portable unit, not built in. My plan is to run a wire in the attic about 80', from the breaker box/transfer switch, to an outlet in a waterproof box under a covered patio, then use a double male "extension cord" from the outlet to the generator's 50 amp plug, for about another 45'.
My question is this. What size wires should be used to safely move the power that distance? I have been told everything from 4 AWG to 10 AWG, mostly by alleged electricians who at least appear to make a living at it.
During the last storm, I was using 100', 12/3 extension cords to run individual freezers and the like, with no problem.
I am looking to be safe about it. I am not interested in the cheapest thing, and I am definitely not interested in burning my house down. I'd like a little overkill, but on the other hand I don't necessarily want to spend a bunch of excess money for nothing.
Understanding that obviously the larger the wire the better, without going totally overboard, what would be a reasonable and very safe wire size for this project?
Is 6/3 w/ ground SER for the 80' run in the attic, and 6/4 SO for the 45' "extension cord" suitable, or is 4/3 SER and 4/4 SO needed, or is there something totally different out there?
I am not planning on doing this myself, but I do want to be able to make an educated decision regarding what materials to use, and who to use to put it together. Seems like some people may cut corners on materials to get the bid.