4-wire power to 3-wire receptacle

[ez-duzit]

Need to hookup an adapter for temporary jobsite power to Miller Dynasty 200DX. Available is 50-amp, 230-volt, 4-wire receptacle. Welder has 50-amp, 230-volt, 3-wire plug. Should the center pin of the adapter's 3-wire receptacle be connected to neutral (white) or ground (green) or both? Maybe a dumb question, but just want to be safe.

 

[Terry D]

You would just need the 2 hots and the ground going to the welder receptacle, no neutral. The U shaped/ round pin on the 4-wire receptacle is the ground. You better change 230 to 240 volts in your post, some people will jump on you about that.

 

[ez-duzit]

Jobsite receptacle looks like this. Is wired single phase. Ground is outer housing.

 

[sberry]

Just out of curiosity,,, is this a main panel or a sub? Another curiosity, I am not familiar and cant remember them all but what is that recept?

 

[ez-duzit]

It is a sub-panel at a boat dock which supplies power to an individual boat.

 

[sberry]

Nother curiosity, how heavy of a weld you got to make? I assume the center pin is the ground and bonded to the yoke.

 

[ez-duzit]

Tig welding 0.083" and 0.065" wall thickness stainless tubing. Already committed to adapting power to 230-volts receptacle.

 

[Kevin Essiambre]

OP, you are correct that the outside is the ground on that receptacle. I've attached a photo for reference.

To go from the 50 amp 125/250 twist lock to your 6-50 receptacle you need, you'll connect the ground to ground. X and Y are your power terminals on the plug and receptacle. Ignore the W terminal, that is for the neutral which you won't need.

I'd make a nice adapter cord, maybe 10' long with 6awg cable with the right ends for the cable. Then you'll have one for future use. Or, with 10' of cord, you could just keep changing the male end to whatever plug you need. Either way, it's handy to have adapters for different receptacles.

 

[AngryBeaver]

Kevin is right, except you have a CS8364 plug. the two with the tabs inboard are the two hots. (x and Z) W is not needed on the welder. The center pin in for alignment purposes only

This is a very common plug on rental generators for single phase power and carry one of these adapters on my service truck for running my 200 amp tis/stick machine.

 

[Kevin Essiambre]

Kevin is right, except you have a CS8364 plug.

I used the CS6365 because it's the first image that popped up with the info I wanted.

Either way, OP, just make sure to use the markings on the receptacles/plugs. They will all be marked.

 

[Norcal]

Is the receptacle on a spider box? The CS locking receptacle & inlets are pretty much standard on them, usually have 1, 30A 240V receptacle, & a number of GFCI protected 20A 120V locking receptacles on them. As mentioned above, the plugs/receptacles/connectors are marked, most common CS locking brand is Marinco, probably cheaper, but I still prefer Hubbell.

 

[ez-duzit]

Thanks fellas. Wired it to ground and it worked fine. Pretty sure the plug I have on the adapter is Hubbell.