"Dave Liquorice" wrote in message
idual.net...
On Mon, 11 Mar 2019 01:36:59 +0000, The Natural Philosopher wrote:

Same thing is observed on telephone poles. Any explanation? Is
the
pole put in at a bit of an angle so it's always leaning one way?

The weight of the cables puts an assymetric laod on the poles near the
end of long cable runs

Though coming from the weight the tension in a phone
line is much higher to get a shallowish catenery so the
line doesn't flail about too much in the wind.

That isnt what happens here. Where the phone line isnt
underground, its on the power poles and the power lines
are the problem. We don't have any catenery with our
phone lines. Even the much older aerial phone lines seen
in rural areas run by themselves have no catenery at all.

It's really only poles at the end of a line or where the line sharply
changes direction that have assymetric forces. With poles
roughly equally spaced and in a row the forces balance out.