Is there a simple formula for determining the unbalanced neutral current in a 3p-4w system? I know how to calculate it if the line to neutral loads on two phases is equal and the line to neutral load on the third phase is different, but what if the line to neutral load is different on each phase?

In other words, if I have a 3ph-4w 208/120v panelboard and connect three circuits, one on phase A, one on phase B, and one on phase C and the corresponding 120v loads are 10A on phase A, 8A on phase B, and 6A on phase C, what would my neutral current be from the unbalanced loads which are all 120 degrees out of phase?

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