Four wire to three wire 50a/220v adapter?

[Dad Was A Racer]

My shop is wired with three 50a/220v receptacles, two of which are fitted with standard three-wire welder plugs, one of which is a four-wire standard residential code range plug. This is where I have a household oven plugged in for small powder coating jobs.

I would like to build a four wire to three wire adapter, so that if I need to, I can plug a welder into that third receptacle.

I can buy a pre-wired replacement range cord with the four-wire plug molded on one end, and wire up a three-wire receptacle in a single-gang box on the other.

My question is... The four-wire plug has a red, black, white and green wires. What is the correct wiring configuration for connecting the three conductors and the ground to the three-wire receptacle?

On a standard three-wire plug, the black is hot, the white is neutral and the green is ground. It's my understanding that on four-wire, the red and black are both hot (110v each?) the white is still neutral and the green is still ground.

So where do the red and black wires end up on a three-wire plug?

 

[The Cobbler]

the neutral on the range circuit is to provide 120v for the oven lamp , probably the clock & maybe the controls , for 240 volt welder you don't use a neutral so you just use the 2 hots. and the ground
I bought a replacement plug for drier/stove and wired it without the neutral prong for mine

 

[Dad Was A Racer]

the neutral on the range circuit is to provide 120v for the oven lamp , probably the clock & maybe the controls , for 240 volt welder you don't use a neutral so you just use the 2 hots. and the ground
I bought a replacement plug for drier/stove and wired it without the neutral prong for mine

So, does that mean (going from the 4 to the 3 wire) the black goes to the larger hot blade, the red goes to the smaller hot blade, and the green to the neutral?

 

[The Cobbler]

green to ground.
no neutral in a 240 only plug

 

[brewchief]

A quick search found plenty of premade adapters, this one was a good deal so I ordered one for myself, http://www.hobartweldshop.com/adapt...mpion-elite-champion-10-000-welder-generator/

 

[Dad Was A Racer]

A quick search found plenty of premade adapters, this one was a good deal so I ordered one for myself, http://www.hobartweldshop.com/adapt...mpion-elite-champion-10-000-welder-generator/

Well sure, if you want to make it all easy and safe and all that.... Thanks a bunch. Just ordered that cord. And it's on sale, too!


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[exranger06]

So, does that mean (going from the 4 to the 3 wire) the black goes to the larger hot blade, the red goes to the smaller hot blade, and the green to the neutral?

You can put the black wire on the longer blade or the shorter one; it doesn't matter which. Same with the red wire. The green wire connects to the third slot, which is a ground. Just cap the white neutral off; you won't be using it.

 

[ard]

Well sure, if you want to make it all easy and safe and all that.... Thanks a bunch. Just ordered that cord. And it's on sale, too!

LOL.

But if you bought the parts you could do it for twice as much!

 

[sberry]

That is cool that its affordable. Its heavy duty. I got to agree with the above.