trader_4 wrote in news:33f37dfc-9d21-481f-9d0e-b98ec7ca68b6
@googlegroups.com:

Aside from that, does he really need #6 for an AC? Presumbably a home AC?
I have a 5 ton, which I believe is the largest made and it's rated for #8. I
wonder if he's sizing based on breaker, instead of sizing based on the
install instructions and eqpt rating. Meaning I have a 50 amp breaker on
my 8 gauge, 5 ton and it's to code because it's a motor load, not an oven.

Whether he needs AWG-6 or AWG-8 is not really relevant -- neither one is listed for use with
any Romex connector or clamp that I'm aware of which will fit in a 1/2" knockout.

Another question for the OP: do you really need 6-3 (or 8-3, as the case may be) for an air
conditioner? If it's central AC, it's almost surely a pure 240V load, and 2-conductor cable will do
-- and if it's a window AC, 10-3 is almost surely sufficient.