Gregory's ServerSmall sized coax!
This is for underground power delivery, most likely 10/20 kV "Mittelspannung", and it even is the flexible variant, with multiple strands in the central conductor, as opposed to one rod 😉
Surrounded by cross linked HDPE, covered in a layer of conductive plastic to smoothe the field as well as some copper for ground.
Typically found in pairs of three!
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4 comments
  @gigabecquerel actually seen a lot of much thicker RF coax when visiting several broadcast stations. Unfortunately, they are a species going extinct. @gigabecquerel The shipping container cranes at the local wharf have 11kV supplies to them. Via flexible cables with plugs and sockets... |
@gigabecquerel a friend of mine gave me this book which contains handy information to identify stolen cables.
(...apparently they visited a scrap metal dealer once who had written the prices in his copy)