Multiwire Branch Circuits

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Absolutely, see 210.4 and 310.15(B)(4) for pertinent information.

Roger
 
Multiwire Branch Circuits

The reason I ask this question is because of some conversations with an electrical inspector about harmonics and the specs on jobs calling for dedicated neutrals or super neutrals
 
Specs are not code, although the inspector could enforce the specs as part of a plan review.

Roger
 
Agreed, but there is alot of concern these days about overloading of the neutral caused by electronic equipment creating eddy currents and having harmonic interference
 
Gus101 said:
Agreed, but there is alot of concern these days about overloading of the neutral caused by electronic equipment creating eddy currents and having harmonic interference
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That is not new, and you really have to have an otherwise poor design before it is an issue.

In other words if you heavily load each leg of a MWBC (Multi Wire Branch Circuit) supplying non-linear loads then at that point harmonics might be an issue.
 
Gus101 said:
Agreed, but there is alot of concern these days about overloading of the neutral caused by electronic equipment creating eddy currents and having harmonic interference
Click to expand...

And most of this concern is unwarranted at branch circuit levels.

Transformers are at more risk from accumulative neutral loading and this can be handled a number of ways, a K rated transformer being the most common

Roger
 
the companies that sell wire seem to be very concerned about harmonics. i have never had a problem with a shared neutral.
 
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