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Old 05-14-2013, 11:23 PM   #1
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Has anyone ever seen a #12 coming in to main panel box and both neutral an black coming in to hot side ,breakers are seperated by other ones, is on 2 different tandom circuits 20 amps. .I know white should be neutral but unsure on this set up.
Any info is appreciated.

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Old 05-15-2013, 05:42 AM   #2
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That branch circuit should be a 240 volt only circuit.

Both ends of the white wire should be marked with colored tape or stain to indicate that it is not a neutral.

The up to date code requires that both the black and white be connected to breakers next to each other (or a double wide double breaker) with handles tied together so if one trips then the other is flipped off.

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Old 05-15-2013, 06:17 AM   #3
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I know white should be neutral.
You do not know what you say you know. Electricity does not care what color the conductor insulation is.

But as Allan mentioned if that white conductor is an ungrounded conductor(meaning a hot wire) then it needs to be reidentified with black tape or markings at its ends.

Maybe provide a photo of your situation
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Old 05-15-2013, 09:17 AM   #4
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Has anyone ever seen a #12 coming in to main panel box and both neutral an black coming in to hot side ,breakers are seperated by other ones, is on 2 different tandom circuits 20 amps. .I know white should be neutral but unsure on this set up.
Any info is appreciated.
things that make you go HMMMM ....
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Old 05-15-2013, 09:35 AM   #5
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things that make you go HMMMM ....
Philly... I'm not sure I agree with all aspects of our codes (not restricted to just electrical)

... but seems identyfying a hot white with tape and tieing MWBC (and 240's) together at both the breakers and at panel entrance seem to be just good and inexpensive common sense to me.

I get those Hmmmmmmmmmmmmm's alot on rework.

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Old 05-15-2013, 11:30 AM   #6
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Typically the tandem breaker only grabs one of the hot legs for both circuits. This would only give you 120, not 240 if both the black and white were attached to the breaker. GE has an arrangement where the breakers can be offset by 1/2 space and will grab both legs.

If a tandem is used to feed a MWBC it is quite possible that the neutral could carry up to 2x the neutral current.
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Old 05-15-2013, 11:38 AM   #7
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Typically the tandem breaker only grabs one of the hot legs for both circuits. This would only give you 120, not 240 if both the black and white were attached to the breaker. GE has an arrangement where the breakers can be offset by 1/2 space and will grab both legs.

If a tandem is used to feed a MWBC it is quite possible that the neutral could carry up to 2x the neutral current.
Jim... on another thread I swore I had seen that pup.....a tandum that grabbed both phases... is GE only maker to your knowledge

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Old 05-15-2013, 11:55 AM   #8
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Two posts for same problem? wire connection
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Old 05-15-2013, 12:35 PM   #9
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And 2 posts about feeding the sump pump too.

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