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Old August 26th, 2020, 12:27
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Bent Bent is offline
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Question MIG ground cable question.

My welder (Millermatic 252; 30A - 300A) has a 15' wire feed cable on the gun but only a 10' ground cable. I'm wanting to go to 15' on the ground as well. The current ground cable is 3 gauge. Should I bump it up to #2 for the added length?
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Last edited by Bent; August 27th, 2020 at 11:40. Reason: add '
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Old August 27th, 2020, 06:18
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Re: MIG ground cable question.

Is there a table of specs that shows how much amperage is going through that cable when you have the machine working at max capacity?

It would be nice to have actual numbers, but even without them I doubt you need to upsize the cable for an extra 5'. If you wanted to add 50' to it that might be another matter, but as long as the amperage drawn is not being changed I don't think you need to worry about it. Cable sizes generally correspond to amperage and don't change much until you get to substantial lengths. Unless you are already right at the edge I can't see how going from 10' to 15' is going to make a noticeable difference.

On a related tangent, have you looked at the MagSwitch ground connectors? Where were those things 20 years ago? Or why didn't anyone tell me about them earlier?
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Old September 15th, 2020, 04:04
Jeremiah Chaney Jeremiah Chaney is offline
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Re: MIG ground cable question.

Quote:
"Where were those things 20 years ago? Or why didn't anyone tell me about them earlier?"
I've been asking the same thing for years.
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Old September 17th, 2020, 12:38
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Re: MIG ground cable question.

You should be fine but it might give you better control with larger cable.
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