I think I've seen two-phase power once, in a commercial building in Philadelphia, built around 1905. All the high-power uses (HVAC, mostly) in the building were actually driven off 208 or 480 volt three-phase, provided by phase-converting transformers and switch gear. There were a handful 240-volt circuits that were stepped down (or tapped?) from the 480, and a lot of the lighting was run off the 277-volt phase-to-neutral of the 480 circuits. The building electricians regarded the two-phase four-wire power as a damned nuisance.
Two-phase is surely uncommon in the US, while split-single-phase is ubiquitous. On Sun, Feb 12, 2017 at 6:41 PM, Mike Thompson <miketh...@gmail.com> wrote: > > > On Sun, Feb 12, 2017 at 4:34 PM, Warin <61sundow...@gmail.com> wrote: > >> On 13-Feb-17 10:25 AM, Tristan Anderson wrote: >> >> If two-phase power isn't currently in use anywhere, it simply means we >> won't see any instances of the tag phases=2, just like how we'll never see >> phases=17. It doesn't make anything fundamentally wrong with the tagging >> scheme. I believe this is a good proposal that should be voted on. >> >> >> There will need to be very careful wording of phases=2 to avoid American >> mappers misusing this tag for 240v split single phase. >> > That is my concern. This is a typical mistake. > >> I think there will be instances of phase=2 occurring in the USA, >> possibly many instances. >> > Do you mean instances of the tag phase=2, or actual two phase power? > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > >
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