On 13-Feb-17 06:09 PM, François Lacombe wrote:
Hi,
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.
In Australia;
Heavy industry gets 3 phases.
A few houses may get 2 phases if their load is very large .. but it is
unusual and a safety concern, no single room should have more than one
phase.
Even fewer houses get 3 phase .. usually where the workshop has a
requirement for a 3 phase motor/furnace.
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.
https://upload.wikimedia.org/wikipedia/commons/e/e3/Bridleway%2C_Atwick_-_geograph.org.uk_-_386117.jpg
Furthermore, I'm wondering what's the best tagging regarding
transformers or switches installed on top of power poles/towers :
power=pole
transformer=distribution
voltage=...
phases=...
or
power=pole
transformer=distribution
transformer:phases=...
transformer:voltage=...
Looking forward to your comments
Transformers will have an input voltage and an output voltage, usually
these voltages are different.
Most of the time these voltages will be on the lines connected to the
transformer (and the pole) and would be redundant.
Switches ... usually used for isolation.
All the best
*François Lacombe*
fl dot infosreseaux At gmail dot com
www.infos-reseaux.com <http://www.infos-reseaux.com>
@InfosReseaux <http://www.twitter.com/InfosReseaux>
2017-02-13 1:39 GMT+01:00 Tristan Anderson
<[email protected] <mailto:[email protected]>>:
There's an intersting discussion about this here:
https://wiki.openstreetmap.org/wiki/Talk:Tag:power%3Dtransformer
<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 <[email protected]
<mailto:kevin.b.kenny%[email protected]>>
*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
<[email protected] <mailto:[email protected]>> wrote:
On Sun, Feb 12, 2017 at 4:34 PM, Warin <[email protected]
<mailto:[email protected]>> 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?
Instance of the tag phase=2 misused.
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