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how many amps for brass ground clamp?

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  • how many amps for brass ground clamp?

    my miller 252 is coming monday i always wanted the brass ground clamps they work great is 400 amp brass clamp enough?
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  • #2
    Yes
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    • #3
      You need a ground clamp rated for at least as many amps as your machine. A 400A clamp is more than sufficient for a 250A machine.

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      • #4
        Hmmmm....Miller calls for an 8ga ground conductor, and 8ga wire is only rated for 40-55A depending upon which type so I'm confused. Ohhhhh...you guys are talking about a work clamp!

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        • #5
          Originally posted by G-ManBart View Post
          Hmmmm....Miller calls for an 8ga ground conductor, and 8ga wire is only rated for 40-55A depending upon which type so I'm confused. Ohhhhh...you guys are talking about a work clamp!
          Yes. They are talking about a work clamp.
          I suggest a c clamp type ground/work clamp for mig. I always seem to have trouble with grounds and get machine gun starts.
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          • #6
            Originally posted by sledsports View Post

            Yes. They are talking about a work clamp.
            I suggest a c clamp type ground/work clamp for mig. I always seem to have trouble with grounds and get machine gun starts.
            I know, I was just teasing a little.

            Now that I think of it, if the negative lead is "grounded" no welding is going to happen....lol

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            • #7
              Originally posted by G-ManBart View Post
              Hmmmm....Miller calls for an 8ga ground conductor, and 8ga wire is only rated for 40-55A depending upon which type so I'm confused. ...
              Because you're ignoring duty cycle. Read Article 630 in the National Electric Code.

              EDIT: Oh, sorry, yes, I'm with you. It's a work clamp, not a ground clamp. It can be any polarity, and it is not at ground potential when in use.

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