2018-08-01 17:05 GMT+02:00 Paul Allen <pla16...@gmail.com>: > I have seen a youtube video with an arrangement with a pole and > cross-bar. It uses three > identical insulators. Directly above the pole the insulator is used as a > pin. At the ends > of the cross-arms the two insulators are used as suspensions. One up, two > down, identical > insulators. >
Indeed there are situations where many kind of clamping is used. I think about line_clamp=mixed Especially for such poles : https://previews.123rf.com/images/saovadee/saovadee1406/saovadee140600044/28858354-electric-pole-with-messy-wire-that-look-dangerous.jpg > At the bottom of the page I linked to there is another link to a page with > even more types > of insulator. It's mostly about insulator materials and properties, but > it does also > cover post insulators (a variant of a pint insulator) and a long rod > insulator (a variant > of a suspension insulator). > Thank you, I'll look at those. Note that power=insulator is dedicated to insulators and other keys like material can get the insulator material and so on... It's not exactly what line_clamp intend to describe, see below. > One thing that occurs to me. When I first saw the proposal calling them > line clamps, > I thought that must be industry terminology because I wouldn't have called > them > line clamps. To my mind a line clamp would be a component in the insulator > assembly that grips the wire. After reading the pages I pointed you at, it > appears the industry > does call them what I would call them: insulators. Your proposal appears > to be about what > the industry calls insulators but you call them line clamps. > Proposal deals with clamping wires/cables on supports in general. Insulators are a particular practical mean to do so especially for power where conductors have to be separated from their supports as to prevent electricity to go back to earth. You don't have insulator here : https://wiki.openstreetmap.org/wiki/File:Wooden_telecom_suspension_pole.jpeg But it a suspension clamping. The main point is to remove power dedicated values from tower:type. As it's better to make it global, such values are extended to portals, poles... And to make it an order more global, let's not design it specific to power anymore but suitable for telecom or any other line That's how line_clamp came to my mind. Should I update the proposal and rationale chapter? All the best François
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