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Let's say I have a 120/208V 3Ø 4W 100A panelboard serving an area. On this panel I put a 40A 208V 3Ø motor and the rest of the loads on this panel are 120V single breakers, lets say they're non linear so there is current in the neutral. Per NEC I have to bring 3#3 AWG wires to this panel, but...

Hey guys, I'm a consultant electrical engineer in nyc.  I happened upon your board here while researching the PE and thought that I should sign up cause this board is pretty neat.  I'm also of course looking to take the Power PE in California for October 2017.  My cutoff experience didn't allow...