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Thread: 4-wire power to 3-wire receptacle

  1. #1
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    4-wire power to 3-wire receptacle

    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.

  2. #2
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    Re: 4-wire power to 3-wire receptacle

    Quote Originally Posted by ezduzit View Post
    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.
    If you're talking about a 14-50R, then it should go to ground if that is what it is designated on the original plug. Neutral not needed unless you need 120V input power.
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  4. #3
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    Re: 4-wire power to 3-wire receptacle

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

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  5. #4
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    Re: 4-wire power to 3-wire receptacle

    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' ling 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.

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  7. #5
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    Re: 4-wire power to 3-wire receptacle

    One best ways is go to Home Depot and look best price in 50 amp.
    I typically use a range plug 4 wire 50 amp (2 wire hot {red & black} wired 1 ground{green} and 1 Natural {white}).
    I can use for everything.
    The 3 wire is 2 hot and ground good welders but if something needs neutral your out of luck.

    Dave

    Quote Originally Posted by ezduzit View Post
    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.

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  9. #6
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    Re: 4-wire power to 3-wire receptacle

    Thanks fellas. Got the job done after wiring it to ground.

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