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Old 03-15-2010, 05:01 PM   #1
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Would 277v lighting circuit be considered MWBC


Would 277v lighting circuit be considered MWBC?

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Old 03-15-2010, 05:47 PM   #2
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Would 277v lighting circuit be considered MWBC


voltage has nothing to do with a circuit being part of a MWBC.

when you have 2 or more legs (or phases), using a common neutral, that is a MWBC.

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Old 03-15-2010, 09:30 PM   #3
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Would 277v lighting circuit be considered MWBC


What does MWBC stand for?
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Old 03-15-2010, 09:38 PM   #4
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Would 277v lighting circuit be considered MWBC


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What does MWBC stand for?
Multi-wire branch circuit
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Old 03-15-2010, 09:39 PM   #5
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Would 277v lighting circuit be considered MWBC


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Would 277v lighting circuit be considered MWBC?
If you have to ask such a question what are you doing messing with 277v???
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Old 03-15-2010, 10:00 PM   #6
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Would 277v lighting circuit be considered MWBC


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if you have to ask such a question what are you doing messing with 277v???
amen.
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Old 03-15-2010, 10:17 PM   #7
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Would 277v lighting circuit be considered MWBC


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Multi-wire branch circuit
So the 'multi-wire' portion of 'MWBC' refers to the energized conductors only?
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Old 03-15-2010, 11:37 PM   #8
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Would 277v lighting circuit be considered MWBC


277 Volts from a MWBC would involve using a 480 Volt source. Not exactly a DIY project.
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Old 03-16-2010, 07:28 PM   #9
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Would 277v lighting circuit be considered MWBC


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277 Volts from a MWBC would involve using a 480 Volt source. Not exactly a DIY project.
Huh? All 277 volt service originates from 480 volt service, irregardless of MWBC status or not, correct?
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Old 03-16-2010, 07:55 PM   #10
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Would 277v lighting circuit be considered MWBC


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Huh? All 277 volt service originates from 480 volt service, irregardless of MWBC status or not, correct?
I kinda think that was the point.
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Old 03-16-2010, 07:56 PM   #11
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Would 277v lighting circuit be considered MWBC


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So the 'multi-wire' portion of 'MWBC' refers to the energized conductors only?
I'm not really sure what you mean.

It refers to the circuit conductors, but not the equipment ground.

To be honest I have no idea how MWBC came to be used as the term for this.
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Old 03-16-2010, 08:00 PM   #12
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Would 277v lighting circuit be considered MWBC


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I'm not really sure what you mean.

It refers to the circuit conductors, but not the equipment ground.

To be honest I have no idea how MWBC came to be used as the term for this.
I'm simply making fun of what I think is an incomplete acronym. Why is a 120V circuit utilizing a 12-2 NM cable not considered a MWBC?
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Old 03-16-2010, 08:08 PM   #13
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Would 277v lighting circuit be considered MWBC


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I'm simply making fun of what I think is an incomplete acronym. Why is a 120V circuit utilizing a 12-2 NM cable not considered a MWBC?
I guess because only a single wire is using one neutral, not "multi-wires".
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Old 03-16-2010, 08:11 PM   #14
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Would 277v lighting circuit be considered MWBC


I propose a new acronym. MWUONBC - multi-wires using one neutral branch circuit.
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Old 03-16-2010, 08:56 PM   #15
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Would 277v lighting circuit be considered MWBC


A two wire with ground 277 volt branch circuit is no more a MWBC than a two wire with ground 120 volt circuit. You must have a neutral not a grounded leg to have an MWBC.

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