Wiring NEMA 6-50R
 

I know this is beating a dead horse but I feel like I need some clarification. I will be installing a NEMA 6-50R Receptacle for a welder in my garage and I have figured out that I will not need the neutral from reading other posts here. But do I need to ground the receptacle box? I am using a metal Raco box.

are you running a new cable with an equipment grounding conductor? if so, ground the metal box the receptacle is located in.

Yes, new cable, 6/3 NM. So if the ground is connected to the receptacle, how do I go about grounding the box?

The box should have a tapped hole for a 10-32 screw.

Yep, I stuck a green ground screw in it. Do I then wirenut two pieces of bare #10? to the cable ground and attach one to the box and one to the receptacle?

install a pigtail on the receptacle and a pigtail on the box ground. wirenut the two pigtails with the ground in the cable. done.

Got it. Duh. Thanks.

Leave the ground long, wrap it around the screw, then on to the receptacle. NO need for splicing.

You only need a 6/2 cable for a welder outlet. The neutral wire would not be used if you installed a 6/3.