Another Welding Receptacle Question

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GeorgeB said:
Eye arnt a lectricshun, but have worked with many while commissioning my electro-hydraulic installations. All large companies seem to connect maintenance welders (as opposed to production machines) with plug-in disconnects which have to be off to plug or unplug the cord. Is this not almost universal?
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I believe they have an interlocking device to prevent unplugging under load, however I don't think this alone qualifies as a 'switch' as stated in 630.13:

"The disconnecting means shall be a switch or circuit breaker"...
 
xguard said:
I am installing a 6-50 receptacle for a welding machine. The welder comes with the 6-50 plug on the cord. I see in 630.13 a disconnecting means is required in the supply circuit if it is not equipped with a disconnect mounted as an integral part of the welder. The welder has an on/off switch, I don't know if this counts as a discconect, it doesn't sound like it. The supply circuit does have a branch circuit breaker in the breaker panel, can this count as the disconnect? It sounds like it to me but from other threads I read it sounds like others are installing a switch right next to the receptacle or using an integral disconnect/receptacle. I don't see the words "within sight" or "immediately adjacent to" or anything similar. What's the deal?

Thanks
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To me a disconnect is required in the supply circuit.
And there is because the receptacle if fed from a circuit breaker.

The welder has an on/off switch.
I don't consider this a disconnect but we still have a disconnect in the breaker that feeds the receptacle outlet.

I agree with the OP that it doesn't say the disconnect needs to be "Within Sight" or "Immediately Adjacent To".

I agree with that the cord shouldn't be jerked out under load but then again we cant keep someone from cutting the cord in half with a pocket knife in an emergency either.

With all that being said, what part of his install would require him to put a disconnect just ahead of the receptacle he's fixing to install?

JAP>
 
I looked up a small welder and if it was typical of these small units then the OP is good. The switch broke both legs. This with a cord connection should satisfy the NEC for a disconnecting means for a single small welder.
 
jumper said:
I looked up a small welder and if it was typical of these small units then the OP is good. The switch broke both legs. This with a cord connection should satisfy the NEC for a disconnecting means for a single small welder.
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Plus the fact that I don't think anyone realized the OP mentioned there was a circuit breaker at the supply.

He should be good to go with that alone. So go ahead and break the switch off in the on position, and cut off the plug and hardwire that cord!:)
 
Thanks for the discussion guys. It doesn't seem clear cut for my application so I'll err on the side of reasonable deductive reasoning and take the cheaper route. That's meant to be humorous obviously. I can't see for my application a separate disconnect enhancing safety on top the wording of that section not being clear. Or at least not making sense given the wide variety of applications.

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I put in some big 3p welders.
Yank is something you do with one hand.
When you have to use shoulder that's not a yank

They were dedicated cts and the panelboard was in sight.
Bee sting angled plugs I remember.
 
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