What sized breaker on those "50" amp circuits? If 50 amp breaker, then you can't use 8 AWG (too small). The breaker must be sized to the weakest 'link' in the system, which is almost always the wire...
I was planing on # 6 and a 50amp breaker in case i upgrade,
My welder is only a SP-175 Plus Lincoln Wire Feeder / MIG Welder
I used a 8/2 with ground and 40A breaker for it.
