Do I Have A 30 Amp Or 70 Amp Welder. And Help Wireing It. - Electrical - Page 2 - DIY Chatroom Home Improvement Forum


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Old 12-04-2006, 09:40 PM   #16
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Do I have a 30 amp or 70 amp welder. And help wireing it.


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Originally Posted by cebola View Post
Now....there must be something in there that I goofed on?????
Actually you were correct and I was wrong. I took the 220v column. I should have used the 230v column.
47.5a is the input. So the suggestion to use a 50 amp circuit and receptacle is a good one.

The only thing I would do is use "standard" wire sizing as I said before. I do NOT like to use the NEC special permissions for welders and motors in residential settings.
You never know. The next homeowner may plug a kiln in to that 50 amp receptacle.
Wired with #12 as the instructions state would be a real hazard feeding anything but a welder.

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Old 12-04-2006, 09:51 PM   #17
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Do I have a 30 amp or 70 amp welder. And help wireing it.


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Originally Posted by Speedy Petey View Post
Wired with #12 as the instructions state would be a real hazard feeding anything but a welder.
Yeah, that would be 100% legal for a welder, but boy... it sure would throw a home inspector for a loop.

I often get calls to install 50 amp receptacles in garages for an extra range for people to use during canning season. I can just imagine what would happen if someone plugged a range into a 50 amp receptacle set up for a welder. It would be legal for a welder, but there's no mechanism in place to prevent a homeowner from using it in other ways. That's why I prefer to feed resi welder receptacles full size.
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Old 12-04-2006, 10:21 PM   #18
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Do I have a 30 amp or 70 amp welder. And help wireing it.


IMO the section for welders does not even apply in a residential setting.

To be accurate, you are wiring a receptacle, not a welder. What you plug into that receptacle is up to you.

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