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Welding table wiring question

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4020

11-29-2006 16:31:03

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I am building a metal welding table and would like to wire 4 110 electrical outlets on it. I was wondering if when i mig weld and am not creating a good ground that it would backfeed and destroy the 110 wiring. The 220 outlet is not going to be mounted on the table. I would really like to have the outlets on the table, so if it could backfeed is there any way to prevent it from happening.

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sberry

02-17-2007 10:29:15

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

We feed the table with gfci and use only 2 wire, it keeps anything from getting in the loop and I do have the table bonded thru the floor via rod to the building steel in case of a fault from another circuit somehow.

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mjbrown

11-30-2006 03:12:50

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

I would suggest you use outlet face plates with covers to keep out metal bits and fileings.

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John T

11-29-2006 18:06:40

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

Like most others, I also would bond the metal table to the welders ground return with sufficient sized cable. Provided they are all wired correct, I dont see any problems with the receptacles being mounted to the table, if they are in metallic boxes then the boxes are bonded to the 110 services safety equipment ground and so would the table assuming the metal boxes attach direct to the steel metal table. If that welder is an AC transformer buzz box its isolated from the utility ground and the voltage and resultant current from the welding electrode to its other conductor (table and welding ground clamp) is between those two points ONLY and NOT to the utility ground buss.

I say bond the welders ground clamp system to the table and use 120 volt receptacles with their own green safety equipment ground and youre off to the races.

John T

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Gerald J.

11-29-2006 17:10:45

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

Like has been said, a permanent welder return cable would be good.

Alternatively you could use plastic outlet boxes and so not ground the outlet grounds to the table. They might not survive weld slag though, but the outlet faces wouldn't either.

Gerald J.

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135 Fan

11-29-2006 17:07:42

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

If all your wiring is correct and grounded properly, you won't have any problems. It's common to have plug ins on a welding table. If the ground from the welder isn't hooked up, the welder shouldn't work. If it does, you've got some faulty wiring or grounding. Dave

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Cliff Neubauer

11-29-2006 17:00:36

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

Just be sure to put the outlets along the front of the bench. I have one bench that way and another with the outlets on the wall behind the bench and I'm still kicking myself for not putting them along the front of that bench.

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Bob

11-29-2006 16:52:35

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

I once had a 120 Volt chopsaw sitting on a metal welding bench, and the welder ground wire had dropped off of the metal table, unknown to me.

When I began to weld, it burnt up the cord on the chopsaw, and the outlet ground circuit, all the way back to the breaker box.

Moral of the story, permanently BOND the metal bench to the ground on the welder, with heavy wire, similar in size to the welding ground wire you now have.

That will prevent any problems, if the ground clamp falls off, or isn't making contact ith the work.

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Crem

11-29-2006 17:34:13

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Re: Welding table wiring question in reply to Bob, 11-29-2006 16:52:35

I can see how you could have burnt the ground wire on your chop saw. The conditions have to be right, or should I say wrong. One way would be if your welder ground cable was laying on top of your welding machine and making contact with the metal welder housing. The welding current would go from your work table through the metal frame of the chop saw, through the ground wire in the chop saw power cord, back to the breaker panel and then out through the ground wire of the power cord of the welder and then to the ground clamp that was laying on the welder. I am retired now, but we had a lot of weird problems like that involving welding tables and the different equipment around them. They let the smoke out of a lot of cords. :o)) We actually built our own ground fault detector that would sense a current in the ground wire in the welder power cord and shut the machine down. Some newer welders now have that protection built in, but that won't protect the other equipment in the area though.

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Bob

11-29-2006 16:52:31

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

I once had a 120 Volt chopsaw sitting on a metal welding bench, and the welder ground wire had dropped off of the metal table, unknown to me.

When I began to weld, it burnt up the cord on the chopsaw, and the outlet ground circuit, all the way back to the breaker box.

Moral of the story, permanently BOND the metal bench to the ground on the welder, with heavy wire, similar in size to the welding ground wire you now have.

That will prevent any problems, if the ground clamp falls off, or isn't making contact ith the work.

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IaGary

11-29-2006 16:41:03

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Re: Welding table wiring question in reply to 4020, 11-29-2006 16:31:03

Can't say it won't ever happen.

But where I worked at the welding shop the metal outlet boxes where fasten right to the all metal table and we never melted one and there were times we forgot to hook up the welding ground to the table.

And that was up to 6 welders at 3 differant tables at once.

I would not worried about it at all.

Gary

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