Roger
Thanks for posting that equation, I'm guessing its some quadratic solution. Can you post a link? where I can find an explanation for how they derive it?? I'm asking as this has puzzled me for some time. I had a location where I was feeding a pump with 2 motors. I shared a neutral for these 2 120 loads. After I had got this pump running I switched on both motors and checked the current in neutral with a clamp on, expecting to see 0. Surprise,I didn't. This was fed from a sub panel installed by others. It was 2 phases of a 208 y service. Anyway the motors name plate showed the motors at 9 amps and they checked correctly on hot conductor but the neutral showed 4 amps when both were running. I finally realized why I didn't see 0 but couldn't explain why I was getting 4 amps. Using your formula I should see nameplate on neutral.?
