But they don't go in opposite directions, that's the problem. When the phase angle is 180 degrees, "loads" cancel, so the neutral current is the value of L1 - L2. This is the pretty normal case. However, if L2 is a "negative load" (production), L1 - (- L2) is a bigger number.I'm with Smart$, not seeing it either. Seems to me the neutral current should still go in opposite directions and balance each other out. I'll wait and hope he draws the diagram though, he's better at that.