oversized neutral

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augie47

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Tennessee
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State Electrical Inspector
I agree with Dennis, but ask that you note the FPN at 210.4(A).
This, as far as I know, is as close as the Code comes to recognizing the possible need for an oversized neutral on 3 phase 4 wire MWBC with substantial nonlinear loads.
The true need for such should be based on engineering data.
 

Dennis Alwon

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Chapel Hill, NC
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Electrical Contractor
I agree with Dennis, but ask that you note the FPN at 210.4(A).
This, as far as I know, is as close as the Code comes to recognizing the possible need for an oversized neutral on 3 phase 4 wire MWBC with substantial nonlinear loads.
The true need for such should be based on engineering data.
Good point Gus. Nonlinear loads can change things a bit.
 

infinity

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New Jersey
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Journeyman Electrician
I don't think that there is any place in the NEC where an over-sized neutral is required for a MWBC. Although it's mentioned it's really a design issue.
 
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