Don't know whether this will help anyone else - but what I understand from
Donald's
explanation is that the three phases are equal and balanced but the neutral is
not
"at the center". Makes sense to my mechanical brain.
Donald H Locker wrote:
> Hmmmm. I'll try some ASCII art.
>
> C
> / \
> / \
> / \
> / \
> / \
> / \
> / \
> / \
> A--------n--------B
>
> Phases A and B are the 120 legs, n is neutral, C is the third phase.
> The angle between A and B is 180 degrees, while the angles CAB, ABC,
> and BCA are each 120 degrees. A-n is 120 volts; B-n is 120; C-n is
> 208 (and at 90 degrees to A-n and B-n, FWIW); A-B is 240; B-C is 240;
> C-A is 240. (these are all RMS values. peak voltage is 1.414 times
> as large.)
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