Originally Posted by

**EricJ**
I'll take a stab at it. I think this is because each leg is 120 degrees out of phase from the other. If you have a load LL between leg A and leg B, leg A will supply some current and leg b will also supply some current. So even though the total current across the load is 92.4 amps, the individual legs will only see 80 max.

Am I in the ballpark Smart$?

Yes, in the ballpark. LL load currents are 120 degrees out of phase but the currents as seen at the connections are only 60 degrees out of phase because one of the two currents, more importantly its angle, is measured backwards. Two equal magnitude currents at 60 degrees out of phase combined will yield a current that is √3 times either component magnitude and at an angle halfway in between. To prove this all you need do is draw the waveforms of the component currents then mathematically add the magnitude at each instance. To simplify, we use vector math to calculate more-complex combined currents.

Last edited by Smart $; 03-20-17 at 03:27 AM.

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