why do pylons make noise?

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why do pylons make noise?

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You need to explain what the hell you’re talking about…

Like the orange plastic pylons that mark out boundaries? Because those are not known to make noise unless you drag them on the ground or smack them etc…

Sounds like either literally wires rattling (or some loose bits) or the metal expanding and contracting with changing temperatures throughout the day. Most noticeable at night when the temperature changes fastest and the ambient sounds are quietest.

edit: Read a bit more in the comments–you’re talking about electrical hum–sounds like cicadas! [https://www.scienceabc.com/innovation/why-do-power-lines-produce-a-buzzing-sound.html](https://www.scienceabc.com/innovation/why-do-power-lines-produce-a-buzzing-sound.html)

Basically it’s the sound of electricity arcing through the air around the wires.

The alternating current creates dynamic magnetic fields. Those oscillating fields translate to physical vibrations in metallic structures