<div dir="auto"><div>Though busy, I will share my opinion on tagging frequency on power lines, and also the use of power route relations<br><div class="gmail_extra"><br><div class="gmail_quote">On Mar 9, 2017 5:40 PM, "François Lacombe" <<a href="mailto:fl.infosreseaux@gmail.com">fl.infosreseaux@gmail.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi David,<br><br><div><div class="gmail_extra"><div class="gmail_quote"><div class="quoted-text">2017-03-09 6:35 GMT+01:00 David Marchal <span dir="ltr"><<a href="mailto:penegal@live.fr" target="_blank">penegal@live.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="m_-140305936841282381gmail-"><br>
> Le 8 mars 2017 à 23:04, Michael Reichert <<a href="mailto:nakaner@gmx.net" target="_blank">nakaner@gmx.net</a>> a écrit :<br>
><br>
> Please keep OSM simple. I don't want to add a power route relation on<br>
> every tiny minor distribution line/cable (230 V).<br>
><br>
</span>Totally agree with that. I don’t understand the usage of a relation binding the distribution network elements: the connections between them can be retrieved from the nodes and ways, </blockquote></div><div>Not always: <br><a href="https://www.google.fr/maps/place/74150+Rumilly/@45.8717133,5.9644766,3a,64.8y,288.41h,97.09t/data=!3m4!1e1!3m2!1sc9ie9WHjYs2bM-s5jagK9g!2e0!4m2!3m1!1s0x478b9d830296190d:0x1ef1a2064da6b8cf" target="_blank">https://www.google.fr/maps/<wbr>place/74150+Rumilly/@45.<wbr>8717133,5.9644766,3a,64.8y,<wbr>288.41h,97.09t/data=!3m4!1e1!<wbr>3m2!1sc9ie9WHjYs2bM-s5jagK9g!<wbr>2e0!4m2!3m1!<wbr>1s0x478b9d830296190d:<wbr>0x1ef1a2064da6b8cf</a><br><br><a href="http://www.openstreetmap.org/node/2560701992" target="_blank">http://www.openstreetmap.org/<wbr>node/2560701992</a><br><br></div><div>Here you would connect all lines while they are actually not, and sometimes the two apparently independent circuits are actually connected at such points. No general rule regarding this.<br></div><div>No relations are currently setup in my example but we'll need to.<br></div></div></div></div></div></blockquote></div></div></div><div dir="auto"><br></div><div dir="auto">Distribution lines tend to have that complicated connections than the main transmission lines, as in the case you used, that is a distribution line branching out from its main circuit via a tap connection. And tapping is very common on distribution systems, and ways to isolate the branch in case of power line issues on the main line where the branch is connected is through mechancal switches or fuse cutouts. Switches will see use on a power line segment connected to another circuit in a distribution system with a radial configuration, but may also appear on higher voltage lines, where they are opened to isolate loads from the main line in case of faults or line repairs. Fuse cutouts are rather limited to distribution systems, and are used to isolate a power line segment from the main line in cases of overcurrent or long voltage spikes, but will not isolate a power line during line repair, unless linemen open them using insulated sticks. Indicating switches or fuse cutouts on a distribution circuit may be useful on power route relations, when assuming that power distributors use the data to locate portions of the circuits having faults, or loads temporarily disconnected for line repairs.</div><div dir="auto"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div class="gmail_extra"><div class="gmail_quote"><div></div><div class="quoted-text"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">and the relation would merely be use for group tagging. IMHO, the relation would only make sense for transport lines, which are often viewed and treated as continuous, even if their characteristics change along their path (overhead, underground…). At a distribution level, however, this sounds overkill to me.<br></blockquote></div><div>Distribution networks change more often between overhead and underground, and seems more messy than a A-to-B transmission lines<br></div><div>Have you seen this example ? <br></div><div><a href="https://www.openstreetmap.org/relation/6087750" target="_blank">https://www.openstreetmap.org/<wbr>relation/6087750</a><br><br></div><div>By the way, you aren't forced at all to make relations if you don't want to, right ?<br></div><div>You can join the discussion ongoing on : <a href="https://wiki.openstreetmap.org/wiki/Proposed_features/Power_routing_proposal" target="_blank">https://wiki.openstreetmap.org<wbr>/wiki/Proposed_features/Power_<wbr>routing_proposal</a></div><div><br></div><div>All the best<br></div></div></div></div></div></blockquote></div></div></div><div dir="auto"><br></div><div dir="auto">And yes,distribution systems will have the most variations in location, either overhead, undergound, or underwater. And while it may occur on distribution systems whose primary lines run in the open countryside instead on the roads, like those in Europe, they are the same on countries where such systems have the primary lines run beside roads or railways, like those in the Americas and most of Asia, but on an urban area, these will usually be found on tunnels accessible via manholes. And finding underground power lines are difficult, unless markers (like manholes or signage) or knowledge from working as a lineman wil help you find their routes. But, it's still fine to add underground or underwater power cables on a power route relation, especially when assuming that utilities or transmission system operators will use the data on the relation to find the specific circuit or line where a line or cable needs repair.</div><div dir="auto"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div class="gmail_extra"><div class="gmail_quote"><div></div></div></div></div></div>
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