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wrote:

Now, of course, three phase power can be either wye or delta connected and
there is a difference between these two kinds of three phase power. I'm
sure you can explain the difference to us in simple terms and which kind is
used for general power distribution and why. When is the other kind used?

Yes, there is a difference, but it is pretty small ... one more
conductor. :-)

Actually there is quite a bit more difference:

No, all of the stuff you posted is due to having the common connection
(neutral conductor) that was mentioned early in the posted text. All
else follows from that one difference.

Matt