[Tagging] Feature Proposal - RFC - Power pole extension

François Lacombe fl.infosreseaux at gmail.com
Mon Feb 13 07:09:30 UTC 2017


Thank you Jherome for this clarification attempt.
No objection against mixing poles and tower on any lines.

Regarding the phase=2 discussion, phases=* have a clear definition.
Occidental countries usualy have 3-phases power grids, but sometimes, 2
phases lines are used to feed train traction substations or heavy
industries. It's not about a single phase line with neutral pole + 1 live
cable, it's 2 live cables often taken from 3-phases substation or line.
According to the picture used, this is the correct value : the transformer
has 2 cables from a 3-phases line (without neutral pole) connected to its
primary side.

Furthermore, I'm wondering what's the best tagging regarding transformers
or switches installed on top of power poles/towers :



Looking forward to your comments

All the best

*François Lacombe*

fl dot infosreseaux At gmail dot com
@InfosReseaux <http://www.twitter.com/InfosReseaux>

2017-02-13 1:39 GMT+01:00 Tristan Anderson <andersontristan at hotmail.com>:

> There's an intersting discussion about this here:
> https://wiki.openstreetmap.org/wiki/Talk:Tag:power%3Dtransformer
> Here it is suggested that split single-phase power be tagged as phases=2.
> I disagree with this, and instead advocate tagging it as phases=1
> voltage=240.  In North America at least, this implies split single-phase
> power.  The tag phases=2 should be reserved for the rare instances (maybe
> not so rare in some parts of the world?) where actual two-phase power is
> present.
> Either way, this needs to be standardized and whatever decision we come to
> needs to be made clear on the wiki pages for power=transformer and the new
> power pole extension proposal.
> ------------------------------
> *From:* Kevin Kenny <kevin.b.kenny+osm at gmail.com>
> *Sent:* February 12, 2017 7:14 PM
> *To:* Tag discussion, strategy and related tools
> *Subject:* Re: [Tagging] Feature Proposal - RFC - Power pole extension
> 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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