220 Plug Types - I have NEMA 10-50
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  1. #1
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    220 Plug Types - I have NEMA 10-50

    Folks,

    A while back I bought that old WWII welder. The plug is a NEMA 10-50 type plug (I think that's what it is called - Picture of the kind of plug below).

    The question is: What about when I buy another machine? My next one is either going to be the Hobart EZ TIG 165i, or the Thermal Arc 3 in 1 machine (I'm still debating on whether Aluminum and Hi Freq are important..... I'm leaning towards yes)....

    Anyway.. I digress.....

    Back to the question: The plug on those machines are not the same kind. How can I plug those newer machines (that must not draw 50 amp input power) into the 220V wall outlet I spent $300 on? Is there a way to do it? Or do I have to install a new outlet for every machine that happens to have a new plug type?


    Here is the type of plug that I have on that old machine.....
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    Never weld more in the morning than you can grind off in the afternoon.....
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  2. #2
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    Re: 220 Plug Types - I have NEMA 10-50

    Replace the 10-50r in the wall and the Plug on the WWII machine with a 6-50 type:

    Just about every machine made now that comes with a Plug has the 6-50 Plug
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  3. #3
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    Re: 220 Plug Types - I have NEMA 10-50

    If the neutral wire goes straight to the neutral / ground buss bar in the load center and is not used as a neutral conductor for another plug. You should be able to just replace the receptacle with the newer style. If you don't know how to find out, get help from a electrician. One mistake and your welder could have voltage on the case, when another machine powers up.

  4. #4
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    Re: 220 Plug Types - I have NEMA 10-50

    Do this: Since basically ALL major manufacturers now have their 240v machines come with a NEMA 6-50P like the one depicted below, you should take out that old outlet and replace it with a NEMA 6-50R outlet. Then, if you ever want to run that old WWII machine, just make a small pigtail with the standard male (6-50P) converted to the female type plug you have on your old machine.

    The "P" stands for "plug", while the "R" stands for "receptacle." I would NOT cut off all of your new machine plugs just to fit in that old style receptacle. Just my opinion.
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  5. #5
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    Re: 220 Plug Types - I have NEMA 10-50

    Today I had Mr. Electric come out to put a new receptacle in my wall outlet that they installed last month. He was 45 minutes late, and then.... put the receptacle in upside down.... He said.... I forget if the ground is up or down on those plugs..... he put it in ground side down.... I said "looks good"..... I had no idea.... I was relying on his expertise to be right.


    WRONG!

    However, when he offered to change the plug on my welder...... for $130....... I looked at him briefly....... and then he said.... "or you can do it yourself..... here's how"...... He totally redeemed himself and saved me $115....

    I went to Lowes.... bought the 6-50 plug..... then changed the plug, and then turned the receptacle the other way.....


    There is a line in Batman returns that goes something like "You always fear what you don't understand"......

    This is true for me and electricity........

    But..... all appears to turn out fine....

    Pics now:
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    Last edited by Fexal; 03-19-2012 at 07:58 PM.
    Never weld more in the morning than you can grind off in the afternoon.....
    Armageddon!!!!

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  6. #6
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    Re: 220 Plug Types - I have NEMA 10-50

    Then I turned off the breaker and proceeded to turn the receptacle around..... it was hard because the wires are stiff and the box is small, but I managed to get that puppy spun around...... then breaker back on.... then plugged it in.... and it turned on..... no fire or Armageddon either!!!

    Woot!
    Attached Images Attached Images     
    Never weld more in the morning than you can grind off in the afternoon.....
    Armageddon!!!!

    Precision TIG 185
    Thermal Dynamics Cutmaster 42
    O/A
    3 Argon tanks
    Facebook...... F2 Metal Works
    ETSY....... https://www.etsy.com/shop/F2MetalWorks

  7. #7
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    Re: 220 Plug Types - I have NEMA 10-50

    Fexal, what have you done?
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    Rick V

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  8. #8
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    Re: 220 Plug Types - I have NEMA 10-50

    Whenever we rotate a device into a box if the wire size is #12 or larger we always snug the screws again, the twisting usually loosens up the connections. Push it into the box how it will sit then pull it back out just far enough to get your screwdriver in there and snug them up.
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  9. #9
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    Re: 220 Plug Types - I have NEMA 10-50

    My Home Depot stopped carrying 3 prong 220 plugs ??? had to go to Lowes .

  10. #10
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    Re: 220 Plug Types - I have NEMA 10-50

    Quote Originally Posted by Rick V View Post
    Fexal, what have you done?
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    Yeah he has power..... And leaves greasy looking welds..... But for a grandpa machine at 70 years old.... He can stay.....


    On the twisting of the 6-50R....... I can pull it out and tighten them up......

    Thanks for the advice....
    Never weld more in the morning than you can grind off in the afternoon.....
    Armageddon!!!!

    Precision TIG 185
    Thermal Dynamics Cutmaster 42
    O/A
    3 Argon tanks
    Facebook...... F2 Metal Works
    ETSY....... https://www.etsy.com/shop/F2MetalWorks

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