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How do I wire a 230v 21amp welder using a 230v 30amp dryer circuit

How do I wire a 230v 21amp welder using a 230v 30amp dryer circuit

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Old 04-15-12, 03:50 PM
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How do I wire a 230v 21amp welder using a 230v 30amp dryer circuit

I have a new welder (230v 21amp) with a NEMA 10-30P cord. I also have an electric dryer (230v 30amp) which attaches to a NEMA 10-30R. The dryer circuit has two hots and a common, no ground. The welder has a hot, common and a ground wire. How would I set up connections so the welder and the dryer can use the 230v 30amp circuit from the panel (obviously only one devise could be operating at a time)?
 
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Old 04-15-12, 05:07 PM
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The dryer circuit has two hots and a common
No the dryer has two hots and a combined neutral and ground.
The welder has a hot, common and a ground wire.
No. If it is 240v it has two hots and no neutral. You could run the welder from the receptacle but you would not have a ground assuming what you are calling "common" is in fact an insulated white neutral. You need to either run a new circuit for the welder or change the dryer to 4-wire and use an adapter for the welder.

Above assumes there is not continuous metal conduit to the breaker box.
 
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