I bought a 6/3 power cord because I noticed the unit didn't have a pig tail attached. I opened the top of the box and the manual to go with the welder. It looks like the welder is supposed to be shipped with a pigtail already wired into the welder. Most obviously it would hook to the back of the switch....

So the 700 series power cable instructions say to use the top two poles on the switch for single phase. But those are the push in and screw clamp connections. The 350 uses spade terminals.

Is the 350 the same as far as connection location goes? I will be using it single phase.