Re: 3 phase power (was Re: Wireless home LAN - WiFi vs Bluetooth?
On Wed, 31 Jul 2019 17:47:13 +1000
Erik Christiansen <dvalin@internode.on.net> wrote:
> On 30.07.19 11:34, rhkramer@gmail.com wrote:
> > Most residential power in the US is created using a single phase
> > transformer (so called because (1) it only takes power from one of
> > the 3 phases mentioned above and (2) darn -- it's a bitch getting
> > old.
>
> Tell me about it. ;-) I'd offer that (2) is simply that there's only
> one primary and one secondary, not three of each, on multiple arms of
> the core.
>
> > The secondary of that
> > transformer is center tapped with the center tap almost always
> > grounded, such that the other two taps from the secondary both
> > produce 120 volts (RMS nominal), but out of phase with each other
> > by 180 degrees.
>
> Those details on this thread have been interesting, because 120v is
> unknown down under - and, I think, in the UK.
>
We use it for tools on construction sites, hopefully through isolating
transformers. I had some trouble getting permission to use a 240V
soldering iron inside a train factory in the UK.
--
Joe
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