Taking 1 leg of 120/240v circuit... up to code/safe?

badmajonMarch 12, 2011

Hi. I have two welders, one is a standard 240v/22 amp MIG, the other is an odd 120v/26 amp stick/arc welder.

Would it be possible for me to install a dryer style 120/240v 30 amp breaker (the ones with a neutral), and pigtail/split one of the 240v leads and the ground? Then I'd have three hot wires, one neutral and two ground. I'd take the two hots and a ground and put them into the standard 240/30a plug, and the third 240, the neutral and the other ground into the 120/30a plug.

Does that sound like a good idea? Would it be up to code?

The other solution is to simply install two breakers. That's not much harder, but I'd like to simplify if possible given that I won't be operating both welders at the same time.

Thank you for reporting this comment. Undo

The equipment grounding conductor MUST NOT be used as a circuit conductor. Under certain conditions, that can be fatally dangerous. If you add an appropriate neutral, properly installed, the plan is fine.

    Bookmark   March 12, 2011 at 9:29PM
Thank you for reporting this comment. Undo

A completely different code section covers welding equipment.

Article 630

Like motor circuits wire size is no longer directly set by breaker size.

    Bookmark   March 13, 2011 at 9:29AM
Thank you for reporting this comment. Undo

My basic reading of 630 says that under certain circumstances wire can be undersized based on the duty cycle of the welder. In a residential setting it might be better to run full sized wire to future-proof the circuit recognizing that the next owner might own a different tool and never look at the wire size.

If the MIG welder doesn't require a groundED (neutral) conductor, then you don't need to use a 4-wire receptacle but in this case you would need to pull 3 wire (+ ground) cable or 4 wires in conduit for a neutral required for the 120v stick welder.

    Bookmark   March 13, 2011 at 10:04AM
Sign Up to comment
More Discussions
Wiring in a 1 1/2" thick wall cavity
I need to run 12/2 wire thru an existing thin wall....
Goodbye Phone Jack: what to do with wires?
We want to remove this phone jack. It's in a useless...
Garage florescent light flickering - bulb or fixture problem?
I replaced the GE F40 RES garage lights with a GE F40...
bibbus 7b
Electrical Problem.
My mom's house has a problem with the lights temporarily...
Debra Johnson
Two fans on same circuit in different rooms, can't get wiring right
So here's the situation. I have two ceiling fan/lights...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™