3P disconnect, 1P output

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B2Buckaroo

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Minnesota
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electrician
30a 3 phase disconnect fed from a 208 4w 30a circuit. (2 loads) phases 1 & 3 fused at 30a 208, phase 2 fused at 20a 120v. Allowing operator to lockout both components of a weld station (feeder and power supply) with a single lock. Is this NEC compliant?
 
Is there any code section that would require it to be labeled that it is fed with two different sources of power?
 
B2Buckaroo said:
The disconnect is fed from a single source ...
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I'm assuming you mean a 3-pole breaker.

One could say it's been turned into a mutli-wire branch circuit. And that is fine. If it were fed by separate breakers then it might violate 210.4(C), but by using a 3-pole breaker you qualify for exception 2.

I'm not sure that it's even a violation without the three pole breaker, because I don't see any prohibitions on optional disconnects that open multiple circuits, MWBC or otherwise. I do think the 3-pole breaker is prudent and eliminates ambiguity regarding compliance.
 
So this is a 3 phase 208 wye source, The welder itself is single phase 208 on 1 &3, and there is some kind of axulliry equipment like a big wire feed or a fume extractor connected to 2 & N????

Am I reading the original post right?
 
It is basically a multiwire feeder to the disconnect and two 120 volt branch circuits after that. Sounds like one could add a third 120 volt branch circuit if they wanted to
 
kwired said:
It is basically a multiwire feeder to the disconnect and two 120 volt branch circuits after that. Sounds like one could add a third 120 volt branch circuit if they wanted to.
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No, it's not two 120V branch circuits. It's one 208V branch circuit and one 120V branch circuit. Read it again.
 
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