Wiring for miller 252/45xp
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  1. #1
    Join Date
    Feb 2015
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    146

    Wiring for miller 252/45xp

    I ran 10/2 for my Lincoln 210mp. From that I have a heavy gauge cord from my lws that’s 30’ to give me more maneuverability in the shop. I have it all on a 30a breaker. Never had issues. I recently got a Hypertherm 45xp and miller 252. No issues with the 45xp but only played around for about 5 mins. Welded on the new 252 also but for a couple mins on 10ga angle. Not working it at all but rather testing.

    To get the most of the welder, I think I need to upgrade my wiring. I have a pole barn and can run it just about however I need to. I’ve considered 6/2 and put in another plug like I currently have or run it along the trusses and make a drop so the wire is closer to where I work.

    Any input on this? I have plenty of options in the panel. It has its own panel and I think 100a going to it.

    Brett

  2. #2
    Join Date
    Jun 2016
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    Re: Wiring for miller 252/45xp

    One man shop. 6/3 and a 50 amp for the 252. I think the book calls for 60 but unless your gluing big iron you'll never run over 180-220 amps or so anyway
    The PM calls for a 40 amp min, I think

  3. #3
    Join Date
    Jun 2012
    Location
    Laredo, Tx
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    3,539

    Re: Wiring for miller 252/45xp

    Yup. 6 gauge. Interestingly I was also pricing out some 6gauge THHN wiring since I might be moving soon. I still can't believe it's cheaper to get a whole 500' roll on Ebay, shipped, than it is to drive to HD/Lowes and pick it up there. How things have change from just 5-10 years ago.
    1st person on WeldingWeb to have a scrolling signature!

    HTP Invertig 221 D.V. Water-cooled
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    Millermatic 211 Inv. MIG w/ Spoolmate 150
    Eastwood 40A Plasma

  4. #4
    Join Date
    Jun 2012
    Location
    CT
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    2,893

    Re: Wiring for miller 252/45xp

    The manual says you can get by with 8 gauge FWIW. I run 6/3 with a 100 amp breaker for my syncrowave. It's nice to have the larger conductor if you need it for something else like a compressor, in the future.
    Millermatic 252
    Syncrowave 250
    Purox Metalmaster

  5. #5
    Join Date
    Feb 2015
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    146

    Re: Wiring for miller 252/45xp

    If I get a 75’ roll of 6/3 romex and run it to above where I’m wanting drop it down, is there a flexible cord I can find at HD/Lowes that I could put a nice end on?

    Brett

  6. #6
    Join Date
    Jun 2012
    Location
    CT
    Posts
    2,893

    Re: Wiring for miller 252/45xp

    probably not Lowes or HD. I had to go to a local electrical supply house to find what I needed. Amazon has it too. 6/3 SOOW Black and white are your hots, and green goes to ground (NOT Neutral)

    https://www.amazon.com/TEMCo-SOOW-SO...70_&dpSrc=srch
    Millermatic 252
    Syncrowave 250
    Purox Metalmaster

  7. #7
    Join Date
    Jun 2012
    Location
    CT
    Posts
    2,893

    Re: Wiring for miller 252/45xp

    Oh and you shouldn't need 6/3 romex (or NM-B). The naming convention for Romex is different than for flexible cable. In a romex you only need a 6/2 (two hots and a ground, no neutral). For the flexible cable (SOOW) the same # of conductors is called 6/3
    Millermatic 252
    Syncrowave 250
    Purox Metalmaster

  8. #8
    Join Date
    Jun 2016
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    Re: Wiring for miller 252/45xp

    LOL . What's a Romex ? I know what Durex are !
    Sorry. I'm a pipe layin' kinda guy

  9. #9
    Join Date
    Feb 2015
    Posts
    146

    Re: Wiring for miller 252/45xp

    Quote Originally Posted by Bonzoo View Post
    LOL . What's a Romex ? I know what Durex are !
    Sorry. I'm a pipe layin' kinda guy
    Only know romex for electrical and magnum for pipe laying

    Brett

  10. #10
    Join Date
    Jun 2016
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    Re: Wiring for miller 252/45xp

    Quote Originally Posted by rustyshakelford View Post
    Only know romex for electrical and magnum for pipe laying

    Brett
    #6 is the wire and #3

  11. #11
    Join Date
    Feb 2015
    Posts
    146

    Re: Wiring for miller 252/45xp

    I ended up tripping the 30a breaker with the 252 last night. It was holding fine for the plasma though. I had a moment of clarity and I believe will be able to not have to run any extra wire. I just need to pick up a 50a female plug. When we sold our big 5th wheel toy hauler I kept the shore line cord. I’m going to get a plug end for it and run it to where I hook in my 50a generator during a power outage. Hopefully it’ll be long enough to get where I’m going and I think it will be but would be much easier than messing around with running more wire. If it’s to short, I’ll just run the 6/2 along the trusses and drop this big cord down for flexability.

    To get to a stopping point last night I just ran the 252 off the bobcat. Worked great. Building a flatbed for my roll off trailer

    Brett
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