[Tagging] Feature Proposal - RFC - Power pole extension

Kevin Kenny kevin.b.kenny+osm at gmail.com
Mon Feb 13 00:14:34 UTC 2017


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 <miketho16 at gmail.com> wrote:

>
>
> On Sun, Feb 12, 2017 at 4:34 PM, Warin <61sundowner at 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?
>
>
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