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Originally Posted by Bodies67
I'm a electrical contractor in louisiana. If you have a 30 amp plugin in your wall you should have a # 10 wire for it. If you need a 40 amp plugin on your welder you need a #8 wire to carry that.If you just change the end the welder could pull more amp's than the wire is rated for and either melt the end of the plug or melt the wire in the wall and cause a fire.If you are not going to use it alot you might be OK.But any new or remodel we do and they want a welder plug . We run #6. It 's good for 60 amps. We always over kill but we don't have fires. Hope this was helpful.
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Great advice here. I tend to run upsize the wire for welders and certain machines due to the fact that they will run a bit hotter as well. Less voltage drop. 30 amp will more then likely have #10 wire which is too small for a 40 amp welder. #8 is fine, but you need at least #8.