Technically 3 Circuits or 1??

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goldstar said:
I suppose you may be correct but then wouldn't the spec be different ? The spec in the OP called for a 3-p 30A breaker for a dust collection unit. What are the chances that's a MWBC ?
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Well the lack of neutral is a dead giveaway that it is not an MWBC, as I mentioned earlier. It is probably what you were pointing out in your earlier post, but I was perhaps being too dense at the time to see it. :angel:
 
don_resqcapt19 said:
But, at least around here, it would be much more common to see three single pole breakers with handle ties than to see a 3 pole breaker for a multi-wire branch circuit.
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Quite true for most MWBC that can be considered single circuits. The other side of that is a single utilization equipment using the lower voltage for control mostly. I haven't run across any that I can recall in the 3Ø category, but most do not consider range and clothes dryer circuits as MWBC... but they are, and cannot be considered single circuits IMO. For the quality vs. quantity portion of this discussion, see 210.4(C) Exceptions No. 1 & 2.
 
goldstar said:
I don't have my code book with me. I'm currently on the beach in Aruba so I'll take your word for it right now :D
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Enjoy...

(C) Line-to-Neutral Loads. Multiwire branch circuits
shall supply only line-to-neutral loads.

Exception No. 1: A multiwire branch circuit that supplies
only one utilization equipment.

Exception No. 2: Where all ungrounded conductors of the
multiwire branch circuit are opened simultaneously by the
branch-circuit overcurrent device.
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...the beach! :cool:
 
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