RV and Welder

oleycowOctober 20, 2010

If I install a 50amp RV service can I plug a welder into it when the RV is not plugged in?

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tim45z10

As long as the welder is rated at less than 50 amps.

    Bookmark   October 20, 2010 at 2:18AM
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mike_kaiser_gw

Maybe I'm off here but aren't RV hook-ups 120/240v four wire (hot, hot, neutral, ground) while most welders are straight 240v with three wires (hot, hot, ground)? I suppose you could use a 4 prong plug on the welder if you made darned sure you got the wires in the right place although I'm not sure that meets code.

    Bookmark   October 20, 2010 at 4:51AM
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brickeyee

" I suppose you could use a 4 prong plug on the welder if you made darned sure you got the wires in the right place although I'm not sure that meets code."

It will work fine with only the required conductors hooked up, and it not a code violation.

You are not restricted to only using 3-wire loads in a 3-hole receptacle any more than only using 4-wire loads in a 4-wire receptacle.

Plugging in a 2-wire lamp is just fine.

    Bookmark   October 20, 2010 at 8:33AM
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oleycow

Yes, My welder is three wires (hot, hot, ground) My hope was that I could just plug the three wire plug into the four wire outlet picking up the hot, hot, ground, and ignor the neutral. Sound like that will work which will save me from adding a seperate welder connection. Thanks for your help.

    Bookmark   October 20, 2010 at 12:59PM
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brickeyee

"My hope was that I could just plug the three wire plug into the four wire outlet picking up the hot, hot, ground, and ignor the neutral. Sound like that will work which will save me from adding a seperate welder connection. "

Unlikely without changing the plug on the welder.

Receptacles are designed to prevent wrong type of plug from being inserted.

    Bookmark   October 20, 2010 at 1:13PM
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oleycow

Unlikely without changing the plug on the welder.

Bummer

    Bookmark   October 20, 2010 at 2:17PM
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wayne440

I have a device for just that purpose, it consists of a NEMA 14-50P plug, NEMA 6-50R receptacle and a short length of 6-3 SOOW cord. It took about 20 minutes to fabricate.

    Bookmark   October 20, 2010 at 3:46PM
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smithy123

i saw at a local mechanics shop them connecting a 6-20r to a 6-50r using a replacement plug, a 4x4 box and some emt. no qo cb box or any cb or fuse for that matter.

    Bookmark   October 20, 2010 at 4:22PM
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brickeyee

Changing a plug is pretty simple.

Larger welders do not even come with a cord or plug, just a terminal strip.

    Bookmark   October 20, 2010 at 8:50PM
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oleycow

I have a device for just that purpose, it consists of a NEMA 14-50P plug, NEMA 6-50R receptacle and a short length of 6-3 SOOW cord. It took about 20 minutes to fabricate.

Of course. Thanks

    Bookmark   October 21, 2010 at 1:34AM
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