On Mon, May 27, 2019 at 10:30 AM Nita Rae Sanders <[email protected]> wrote: > The few poles that have been mapped in my area (rural farming countryside) > are the large cross-country grid feeders (generally 100Kv and up) and a few > 9.6 Kv distribution lines. Having said that, it is my impression that 80%-90% > of the telephony circuits are buried cables with cable tap boxes every > 1/4-1/2 mile. The telco does use existing power poles for drop lines (from a > cable tap to a residence) and occasionally strings overhead cables.
I've mapped only power lines that serve as useful landmarks (or routes of travel - the cutlines are sometimes more negotiable than the surrounding wood) for hikers. They may be lines of any level of significance from major transmission lines to tiny local distribution feeds. > Power poles (around here) have 4 designated (but invisible to the casual > onlooker) segments: The electrified segment at the top, a guard section (in > which no wires are connected), a telecommunications section, and a minimum > ground clearance segment. The exact measurement/height of each segment varies > based on the height of the pole and other factors. It's not unheard-of around here to see a six-segment pole: subtransmission (usually 69 kV) and lightning protection at the top, a guard section, distribution (might be 4.8, 9.6 or 13.8 kV), another guard section, and then telecom and required ground clearance. That makes for a really tall and expensive pole, though, so it's more common so see the subtransmission running on a parallel set of poles, often on the opposite side of a street. I'm all for having some way to map multi-use poles and dedicated telecom poles, but poles dedicated to telecom are not common around here. Almost always the telecom hangs below the power infrastructure - largely an effect of the Rural Electrification Act https://en.wikipedia.org/wiki/Rural_Electrification_Act, which meant that the power lines were already there. For the multi-use ones, I've thus far not worried about the telecom stuff and simply mapped the power line. _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
