[Tagging] Feature Proposal - RFC - Power pole extension

Tristan Anderson andersontristan at hotmail.com
Mon Feb 13 00:39:22 UTC 2017

There's an intersting discussion about this here:


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<mailto:miketho16 at gmail.com>> wrote:

On Sun, Feb 12, 2017 at 4:34 PM, Warin <61sundowner at gmail.com<mailto: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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