Hi Doug:
The picture shows three wires. I assume this is
a DELTA configuration, since a WYE configuration
requires four wires.
I agree with you that most power distribution is
the DELTA configuration.
I suppose one might claim that the fourth conductor
of the WYE is the ground. I would argue that power
transmission through the body of the earth is not a
good practice as the earth's resistance would be
too high.
Yes, in a balanced system, the neutral carries
nearly zero current. But, "nearly zero" could
nevertheless be a lot of amperes in a power
distribution system. The associated voltage drop
in the earth's resistance would still be too high.
Best wishes for the holiday season,
Rich
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