Double Neutral

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Can you be more specific? Do you mean installing a grounded (neutral) conductor twice its required size, or do you mean installing two neutral conductors?
 
2 neutral conductors.
The panel schedule states: Provide w/equipment and insulated isolated ground bus and a double neutral (sorry, I should have added that).
 
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Sounds as though they are asking for a 200% neutral, this means the neutral bar will be set up with double barrel lugs or atleast a lug that will accept two conductors for the paralleled neutral.

The reason for this is the designers anticipation of additive harmonics on the neutral due to nonlinear loads.

Roger
 
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