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Old 07-17-2010, 11:09 PM   #16
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Proby

I don't think you understand what I'm suggesting by using a 15 amp MWBC but the OP has already ran the #12 from the panel ... so Jims suggestion is likely his best bet.
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Old 07-17-2010, 11:18 PM   #17
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I don't think you understand what I'm suggesting by using a 15 amp MWBC
I understand what you are saying, but if we are trying to be code compliant here, 2 15A circuits will not fill in for a required 20A circuit.
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Old 07-18-2010, 12:39 AM   #18
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The issue is are we thinking outside the box and violating the NEC as to following manufacturers instructions which are calling for a 20 amp dedicated circuit to the unit. The other problem is we have fixed space heating which requires a continuous load calculation for the heater. All this considered requires #12 conductors ... and protection according to 240.4D.

So I concur it would not be code compliant to use a 15 amp Multiwire branch circuit.
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