On 5/28/24 15:29, Roy J. Tellason, Sr. wrote:
On Tuesday 28 May 2024 01:49:52 pm Paul M Foster wrote:
I've never see a 3 phase in a house. Common in commercial/industrial,
though.
Residential installations (talking in the US here) typically involve
*one* transformer tapping a single phase out of the three that are up
there on the pole. The secondary is center-tapped, and it's that
point which is grounded at the service entrance. Running 3-phase
power requires *three* transformers up on the pole, much more in the
way of expense if you want that for some reason, and I don't know of
anybody that does that. Even those who are into having some
nontrivial machinery around seem these days to use a VFD to give them
multiple phases at the machine, rather than going through the expense
of having it run in from the pole...
And here you have it from another CET.
Cheers, Gene Heskett, CET.