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TOPIC: Bundled Neutral Wires

Re: Bundled Neutral Wires 12 years 7 months ago #27419

Let me try to help (maybe :P).  There is nothing 'electrically' wrong with having two neutrals under the same screw from a circuit operation point of view, and you are correct in that there would be no difference in that and terminating it on the next screw down the bar (provided more than one wire under a screw is in accordance with the panel manufacturer's instructions).  However, bearing in mind that one purpose of the neutral is to provide a reference point for the circuit, the problem that could arise is when you have to work on one of the two circuits.  Say, for example, that circuits 1 and 3 have their neutrals under the same screw.  You need to work on circuit 1, so you turn that one off and proceed to disconnect the neutral.  Since they are under the same screw, the neutral for circuit 3 is now loose also and may well have become disconnected from the neutral bar itself.  This condition can result in an overvoltage condition for the still-energized circuit 3, possibly causing damage to that circuit's connected load.  Of course, you can argue the unliklihood of there being any resulting problem, but as I understand it, that scenario was the basis of the requiement change some years ago.

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Re: Bundled Neutral Wires 12 years 7 months ago #27438

  • Bert de Haan
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Thank you.  (That's worth a karma.)

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Re: Bundled Neutral Wires 12 years 7 months ago #27439

Agreed, that you for the explanation Frank. ;D

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Re: Bundled Neutral Wires 12 years 6 months ago #30406

  • Bill Warner
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Frank nailed it!

From Schneider Electric, it goes into a bit more explanation combining what David Macy and Frank were explaining:
static.schneider-electric.us/docs/Electr...oards/0100DB0705.pdf

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Re: Bundled Neutral Wires 12 years 5 months ago #30496

I was just going to ask a question about this issue but you all answered it.  Thanks.  I have posted a different question though.

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Re: Bundled Neutral Wires 12 years 2 months ago #33558

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