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.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
