[Tagging] Key:circuits added to power template

[Ole Nielsen]

On 22/01/2013 08:43, Volker Schmidt wrote:
> 1) For a non-expert it is difficult to assess how many circuits a power
> line carries without having access to the operators' documentation.

Right, it will not always be possible to tag the number of circuits when 
a cable doesn't connect to an overhead power line. For underground 
cables at low and medium voltage such information is rarely publicly 
available (but then you probably don't even know that there is a cable 
there). For high voltage transmission grids the number of circuits is 
often indicated on grid maps of the TSO or documented in cable project 
descriptions.

>
> 2) I notice that the wiki page uses the term "cable" for overhead power
> distribution. According to my knowledge and Wikipedia
> (https://en.wikipedia.org/wiki/Overhead_power_line) overhead power lines
> are implemented with "conductors". Cables (i.e. insulated conductors)
> are normally not used in overground transmission.

Again an unfortunate choice of name for a tag that happened in the early 
days of OSM (like station/sub_station). It should in my opinion have 
been conductors=*, not cables=*. Difficult to correct now since 'cables' 
is so widely used.

Ole