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Old 07-22-2011, 11:53 AM   #16
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Help converting dryer plug to welder plug.


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Originally Posted by CheapCharlie View Post
Did the welder come with a 50A plug on it? If so you'll need to plug it in to a 50A receptacle. I wouldn't change the 50A plug to a 30A plug. It's obviously designed that way.
Actually it wasn't designed that way. It came with a cord, one end hard wired into the guts of the machine and blank on the other to chose your own plug for the outlet you have. At the time I had a 50 amp circuit with the 6-50 plug.

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Old 07-22-2011, 11:57 AM   #17
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Help converting dryer plug to welder plug.


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Originally Posted by mpoulton View Post
Ah, yes. Now I get it. Not a problem. The neutral/bonding conductor in a 3-wire 120/240 connection will work perfectly well as a grounding conductor for a 240V-only connection.
mpoulton, No offense, your positive right? I am reading different things about using the neutral for ground, I don't have enough knowledge to deduce anything from what seem to be various conflicting opinions on the WWW. Thank you for the replies.

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Old 07-22-2011, 06:00 PM   #18
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Help converting dryer plug to welder plug.


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Originally Posted by RodBarney View Post
mpoulton, No offense, your positive right? I am reading different things about using the neutral for ground, I don't have enough knowledge to deduce anything from what seem to be various conflicting opinions on the WWW. Thank you for the replies.
It's definitely acceptable in this situation. The circumstance where it's questionable (no longer allowed for new installations, but was standard for decades) is when the load uses the neutral connection as both a current-carrying conductor and also a chassis bonding conductor. That's potentially dangerous. However, your welder has no 120V loads internally so it does not require a neutral, only a bonding conductor.

You probably have a NEMA 10-30 receptacle (two slanted prongs and one L-shaped), which was originally intended as a 3-pole 3-wire ungrounded configuration. If you really want to feel better about using this in a 2-pole grounded configuration, you could replace the receptacle with a NEMA 6-30, which looks like a 15A 240V except bigger. It's functionally identical (there would be no electrical difference at all), but is intended for this application.
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Old 07-22-2011, 08:18 PM   #19
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Help converting dryer plug to welder plug.


Thanks a million!!

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