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Wiring new outlets for 350P

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  • Wiring new outlets for 350P

    We are having our shop wired for a new 350p. The literature specs input amps at 69amp and 61amp for 200v and 230v, respectively. Miller then lists a NEMA 6-50P for the power plug.

    Why do they list a 50amp plug when the input specs are over 60amps? Will a 50amp circuit support this machine?

  • #2
    Originally posted by StakinDimes View Post
    ....

    .....Why do they list a 50amp plug when the input specs are over 60amps? Will a 50amp circuit support this machine?
    A 50 amp 230 volt circuit will only support it to partial capacity... at approx 286 amps (82% of 350amps....[50/61]*350=286 )

    The 6-50 has become the defacto standard for single phase welders right or wrong...
    Last edited by H80N; 08-31-2015, 03:29 PM.
    .

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    • #3
      Originally posted by StakinDimes View Post
      We are having our shop wired for a new 350p. The literature specs input amps at 69amp and 61amp for 200v and 230v, respectively. Miller then lists a NEMA 6-50P for the power plug.

      Why do they list a 50amp plug when the input specs are over 60amps? Will a 50amp circuit support this machine?



      I use the NEMA 6-50P for the power plug on my machine without any problems. I also use a 40 amp breaker and have not tripped it yet.



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      • #4
        I use em on all my machines.
        2- XMT's 350 cc/cv
        1- Blue star 185
        1- BOBCAT 250
        1- TRAILBLAZER 302
        1- MILLER DVI
        2- PASSPORT PLUS
        1- DYNASTY 200 DX
        1- DYNASTY 280 DX
        1- MAXSTAR 150 STL
        1- HF-251 BOX
        1- S-74D
        1- S-75DXA
        2- 12-RC SUITCASES
        1- 8-VS SUITCASE
        2- 30 A SPOOLGUNS

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        • #5
          Wiring new outlets for 350P

          Used it with 350-p & 50amp breaker for close 5 years no problems

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          • #6
            Originally posted by StakinDimes View Post
            We are having our shop wired for a new 350p. The literature specs input amps at 69amp and 61amp for 200v and 230v, respectively. Miller then lists a NEMA 6-50P for the power plug.

            Why do they list a 50amp plug when the input specs are over 60amps? Will a 50amp circuit support this machine?
            You need to pull up the manual and look at the electrical service requirements.

            http://www.millerwelds.com/om/o1327ah_mil.pdf

            You'll notice that it requires a 70amp breaker BUT minimum wire is 8g for rated output.

            This is allowable due to the fact that the machine has a duty cycle- it is not a continuous draw on the circuit.

            A 50amp continuous rated plug (the 6-50p) is acceptable for this application.
            Ed Conley
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            • #7
              You da man Broc,, as a side note since this is new it couldnt hurt to toss a 6 wire in it. I see them on a 50 all the time, I it worked that would be the ideal. There is nothing wrong with a larger breaker for it or a similar machine but ones that come with a factory 50 cord should generally be limited to 50A breakers.
              Last edited by Sberry; 09-01-2015, 08:38 AM.

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              • #8
                Thanks for all the responses. We Are going to have the sparky run one size bigger wire and go with a 50amp breaker and 6-50 plug for now. That way in the future if we have any issues we can throw a bigger breaker in the panel and either hardwire the welder in or use a higher amperage disconnect.

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                • #9
                  I am all for economical but this is cheap insurance especially since this is not a bargain type machine anyway and sounds like a real shop.

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                  • #10
                    Stacken dimes, I bought a 350 P Aluminum and just asked the very same questions and got the same answers, right or wrong I run mine off a 50 amp breaker and a 50 amp plug.

                    I'm not happy about it but it is what it is.

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                    • #11
                      It need not be a 50 amp breaker. You can, if needed, go up to 200% on breaker sizing. Be aware that the rule allowing a level of conductor extra load as it won't be continuous, do nothing to control voltage loss. Unless your run is very close to the utility company transformer, it'll still have to be bigger to prevent excessive voltage loss.
                      Last edited by WillieB; 09-03-2015, 09:01 PM.
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