Thread: Looking to make a power cord extension for a Millermatic250X

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I need about a 30' extension for my welder,and am wanting to run it off of a 220 used for the dryer is this possible?
Volts 200/230
Amperes 48/42
Kw 7.5
Phase 1
Hertz 60


What size cable do I need? Thanks

Dont use less than 4ga. 4 is listed as 60 amps capacity. Consult an electrican for specifics, the 30 ft shouldnt be a problem. What is your dryer breaker rated at?

Use only flexible cord that has the thick, black jacket. DO NOT use cable rated for interior wiring (like Romex) that uses solid wire!!!

Originally posted by robot
Dont use less than 4ga. 4 is listed as 60 amps capacity. Consult an electrican for specifics, the 30 ft shouldnt be a problem. What is your dryer breaker rated at?

Use only flexible cord that has the thick, black jacket. DO NOT use cable rated for interior wiring (like Romex) that uses solid wire!!!

I am thinking I might have too upgrade the 220 breaker for dryer,it has a 30 on the switch.I am thinking this means 30 amps,and the the welder is 48/42,am I correct?

yep it is 30 amp, you would need at least 60 as robot becuase I don't think they make a 50 amp.

Yup, quite easy actually. I made mine from some very heavy cord and the end I got at an electircal supply warehouse. I asked the guy what size I needed, then got one size larger as a safety margin.

I've got a Miller Syncrowave 180, and have 30ft extension of 6/4, only because the supplier was out of 6/,3 going to my dryer plug. I have had no problems yet. It cost me $70.

I'd recomend a 50 Amp minimum breaker, and number 6 stranded copper wire, or even better, a 60 Amp breaker and number 4 wire for the feeder from the panel to the outlet, and an extension made up of number six wire up to fifty feet. Over fifty feet, go up one size to number 4 wire. Use plugs and outlets rated at 50 or 60 Amps. you will probably have to order this stuff from an electrical supply. Also, seek out the assistance and/or advice of a qualified Journeyman or Master Electrician.

yep, 6 AWG stranded would have been my choice, with a 50 or 60 A GFCI breaker. As mentioned, replace the wiring in the wall first, it is probably 8 AWG.

since you are pulling wire to the breaker anyway, why not run a dedicated circuit? That way you can put the outlet where it would be convenient, and won't have to hassle with the dryer.

I had an electrician run a separate line to the garage from the outside box and upgraded the box from 150 to 200 amps, 50 of it being for the welder (Lincoln 200 amp mig). I also use a 30' cord out of the wall socket that I got from the same welding supply house that sold me the welder, no idea on the wire size, but it's big.