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On the 240v 3 prong does it matter which hot I use?

wazzabie

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I'm trying to wire a 3 prong plug. I'm using some very old wire that is connected to a very old welder. The wires are all white. I know which one is the ground. Can I switch the two hots. I don't know which hot it red and black from the welder.

240v-dryer-plug-wiring-diagram-a-database-3-prong-replacement-sears-and-whirlpool-electric-change-cord-the-appli.jpg
 
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sberry

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The other 2 don't matter, hook ground to ground. That aint quite a welder plug but they were often used and may have been legal way back in the day.
 
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wazzabie

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the three plug in the photo is what is current on the welder. I'm swapping it out to a welder plug.
 

The Cobbler

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with 240 there's 2 hots (and no neutral) . so if you know what ground is, the other 2 are hots. it doesn't matter which hot terminal they connect to.
the outlets you pictured are fro 120/240 appliances, that's why they show a neutral
 
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wazzabie

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update: It was just the wires around the plug that had turned white. I cut it back about 4 inches from the plug and the wires are red, green and white. There is alot of fiber strands. I wonder if these old cables have asbestos in them.
 
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wazzabie

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I just read about asbestos in cabling. I'm going to put a mask on and treat this cable as having asbestos. I also created alot of stands that I'm going to clean up carefully.
 

wyliesdiesels

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Neither of those are correct for a welder.

The 10-50 receptacle on the left is the obsolete pre-1996 outlet for a stove.

The 14-50 receptacle on the right is the new outlet for a range.

For a welder, you need a 6-50.
 

u3b3rg33k

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Neither of those are correct for a welder.

The 10-50 receptacle on the left is the obsolete pre-1996 outlet for a stove.

The 14-50 receptacle on the right is the new outlet for a range.

For a welder, you need a 6-50.

I don't see an issue with a welder having a 14-50P on it. the appliance not using the neutral isn't an issue.
 
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wazzabie

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The plug on it now is a 10-50. I'm changing it out to a 6-50. By the way the welder says 60amps but I think I'll be ok with 50amps. My breaker is only 50amps.

I'm more concerned about the fiber strands inside the cable. I made a mess and the stands are all over the place. i wonder if these stands have asbestos.
 
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c39er

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Maybe you should contact an asbestos abatement firm to guide you through your asbestos cord issue.
You might need a permit to dispose of it.
 

Dingleburry

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You can test if its asbestos, crumble the edge of the cable so fibers are showing, or get some of the fibers, get a lighter and try to burn them. If they dont burn, its prob abestos. If it burns its not.
 

Clik

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I read not long ago that asbestos isn't as bad as it's made out to be. According to what I read, there are three types and only one has been known to be a problem. That was somewhat comforting because my old schools linoleum floors were made of asbestos, the school's ceiling tiles were asbestos, a house I lived in was insulated with asbestos, the apartment I grew up in from an infant to a teenager was next to the boiler room full of asbestos covered pipes, my grandparents house was covered in asbestos shingles, I changed many auto brake shoes that were made of asbestos nd there was always plenty of asbestos dust in the drums. I worked doing plumbing and many pipes were covered with asbestos. I used to haul gravel out of a quarry where they were required to wet the gravel down because the gravel dust contained asbestos. I'm 65 and still breathing. I wouldn't sweat a little wire insulation.
 

wyliesdiesels

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Almost every asbestos installation you described would not cause health issues because the asbestos has to be DISTURBED for it to get into someone’s lungs.

Asbestos wrapped on pipes, in tiles and insulation etc, would not harm someone unless they distrubed it. Asbestos does not off gas...
 

Bert_

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If you find material that contains asbestos the best thing to do is get a high speed grinding tool and cut it up producing as much dust as possible. You want to get that dust into your lungs as efficiently as possible.

Seriously asbestos is fine if you don't make dust...
 

The Cobbler

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asbestos is not as bad as claimed to be, unless you get cancer from it... then you're done.
I tend to agree that it's all the thing now, but it is nasty stuff and mishandled, it can cause issues .
 
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