There are a lot more different possible attachments: https://www.hoogspanningsnet.com/techniek/isolatorophanging/. The page is in Dutch but the pictures make it clear. In order: single chain straight down, double chain straight down, half-anchor, anchor, hanging anchor, V suspension, tetrahedron suspension. As shown in the pictures, attachment can even be different for different phase conductors of the same line. —M!dgard [ talk ] 14:53, 12 January 2020 (UTC)
- Thank you for the link. I didn't find any different attachment than those proposed with this key. To be clear, this key isn't intended to give exact attachment solution names (and isn't dedicated to transmission power lines) but to classify them. For instance hanging anchor, half-anchor, anchor correspond to line_attachment=anchor. It may be a good idea to propose anchor=hanging, anchor=half and so on to be more precise.
- such situations is described as line_attachment=(suspension)|(anchor) and actually lacks another key like cables=(2)|(4) to state how cables are arranged on the tower (but design=* with a precise reference to operator's supports catalog can link to the same information). Fanfouer (talk) 18:47, 15 January 2020 (UTC)
line_attachment = none
We miss one standard case: no cables/line connected. Even it doesn't come to mind in the first place and seems to be unimportant. It helps to note there is no line and this value is not simply missing. So I suggest: line_attachment=none. Example: please use your favorite search engine with "zauberlehrling strommast" and you will find pictures of a structure. This could also be used for old infrastructure, where the electric wires are missing (removed), but towers are still there and will be for at least a year. This would be abandoned:power=line on the way and line_attachment=none on nodes.
- I spend a little time to think about it and understand the usecase. Thank you to bring this here, I didn't ever immagine it when proposing line_attachment key.
- To me there is no problem to add this value in regard power supports are expected to support lines and situations where no line is visible and tower is left in place are not usual. You can create the page and add exemples with pictures as to not face arguments like if nothing is visible, add nothing. Fanfouer (talk) 23:22, 24 March 2020 (UTC)