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Old 05-11-2011, 03:08 PM   #16
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220V & 110V outlets


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Originally Posted by rjniles View Post
I would like to see the reference where you found this.
The NEC is generally restrictive, not permissive. If something is not prohibited by the code, it is allowed. Note that HouseHelper did find a provision that specifically addresses this, though.

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Old 05-12-2011, 01:20 PM   #17
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220V & 110V outlets


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I have reread that exception and exception #1 about 3 or 4 times and do not believe the intent is to allow the use of multiple line to neutral and line to line loads on the same MWBC. Maybe we need input from one or more of the working electricians on this forum.
I am a "working electrician" and this is definitely allowed... this is no different than a dryer or range circuit, which is a 120/240V MWBC!
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Old 05-12-2011, 03:26 PM   #18
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220V & 110V outlets


here it is straight from the nec

210.4(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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Old 05-12-2011, 04:21 PM   #19
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220V & 110V outlets


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Originally Posted by The Deez View Post
here it is straight from the nec

210.4(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.

This section to me has been a topic of confusion more than once, but im leaning in the direction that you MAY do this as long as they are the same amperage, and have a simultaneous disconnecting device, thinking logically, if EITHER of the two legs exceed amperage, it will trip both legs, and on the other end if you need to shut of either of the circuits for service, you will be forced to shut off both to eliminate the hazards of neutrals....
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Old 05-12-2011, 04:55 PM   #20
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220V & 110V outlets


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Originally Posted by Scott3229 View Post
This section to me has been a topic of confusion more than once, but im leaning in the direction that you MAY do this as long as they are the same amperage, and have a simultaneous disconnecting device, thinking logically, if EITHER of the two legs exceed amperage, it will trip both legs, and on the other end if you need to shut of either of the circuits for service, you will be forced to shut off both to eliminate the hazards of neutrals....
Agreed, I've only been a licensed electrician for about 10 years. All i have to go by is past experience, and i can honestly say that I haven't done this, nor would i do it and I can think of LOTS of times I had the opportunity to do this wiring method. If it was me and in my opinion i would just run a 12/2 for the 120v stuff and leave the 240v stuff on a dedicated circuit. This is an interesting topic though, I have a meeting with a state inspector tomorrow in Boston for a job, I'm gonna run this by him and see what his opinion is. Maybe he can reveal a secret code article.
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Old 05-12-2011, 05:54 PM   #21
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220V & 110V outlets


I'd opt for a sub-panel to replace the dryer outlet. Then one could run 120 Volt circuits for the standard receptacles, and a separate 240 Volt circuit for the radial arm saw. Separate breakers for each circuit.
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Old 05-13-2011, 01:16 PM   #22
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220V & 110V outlets


Quote:
Originally Posted by The Deez View Post
here it is straight from the nec

210.4(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.
I don't see any ambiguity whatsoever. A MWBC with a double-pole breaker is clearly permitted to supply both 240 and 120V loads. That's the entire point of Exception 2.

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