[Tagging] Discouraging frequency=* on power lines and cables

[Warin]

On 09-Mar-17 03:19 AM, François Lacombe wrote:
> Hi Tom,
>
> 2017-03-08 16:08 GMT+01:00 Tom Pfeifer <t.pfeifer at computer.org 
> <mailto:t.pfeifer at computer.org>>:
>
>
>     The wiki documents for what particular tags are for. This tag is
>     used 826577 times, so this documentation is essential.
>
>     Also, we normally do not delete wiki pages at all. The process
>     would be to discourage or deprecate the tag, however the reasons
>     you gave above are very weak for me.
>
> My point wasn't to delete any page but to remove frequency=* as a 
> possible tag for power lines.
>
>
>     frequency=16.7 is used a lot on railway networks where it is
>     clearly distinguished from the 50 (Europe) or 60 (America) Hz
>     regular energy distribution.
>
>     frequency=0 (used on 35% of the tags) means DC power which is used
>     on specific railways, and could also apply to DC distribution
>     networks that I vaguely remember are constructed differently from
>     traditional 50/60Hz-Networks.
>
>
> I didn't say frequency isn't used but it is actually misused.
> Frequency refers to power routes, not physical power lines

While the lines themselves don't have a frequency (well there are limits 
as to what they will take) themselves, as you say the supporting 
infrastructure (transformers, generators etc) have a nominal frequency.

If you want include a statement that power distribution lines themselves 
do not require a tag of frequency but relationships that have those 
lines as members should have a tag of frequency?
Is that what you are after? Do remember that the wiki is a guide, not 
rules... try not to be pedantic.

>
> Example :
> A 400 kV 50Hz route : http://www.openstreetmap.org/relation/6359644
> Which has lines as members : http://www.openstreetmap.org/way/41773490 
> http://www.openstreetmap.org/way/41828020 where frequency isn't mentioned.
>
> If a 16.7 Hz line would have shared same sections, the relation would 
> have frequency=16.7 and line sections wouldn't.


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