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Flying Penguin
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What exactly is the noise?
Nam_Sapper said:The hum is usually a 60-cycle hum, and is probably caused by the physical motion of the wires or metal coverings on transformers, instigated by the changing EM field, exerting a force on the iron/steel. I expect this is acts like a very inefficient speaker.
On powerlines in the air, there is probably a phase difference between powerlines widely spaced or on different circuits causing the air to act like part of a giant electrostatic speaker (in the hearing range).
OMG. brilliant quip. How did I miss it?faust9 said:Because they don't know the words.
Powerline hum is a low-frequency buzzing or humming sound that can be heard in electrical appliances, outlets, or wiring. It is typically caused by electromagnetic interference from power lines.
Powerline hum is caused by the magnetic fields generated by the electric current flowing through power lines. These magnetic fields can interfere with the electrical signals in appliances and cause the buzzing sound.
If the hum is present when an appliance is turned on but goes away when it is unplugged, it is likely coming from power lines. You can also try turning off the main power to your home and see if the hum stops. If it does, then it is likely caused by power lines.
There are a few ways to stop powerline hum, including using a power conditioner or surge protector, installing a dedicated circuit for your appliances, or using a noise filter. You can also try moving your appliances to a different outlet or using shielded cables to reduce interference.
No, powerline hum is not dangerous. It is simply a nuisance and does not pose any health risks. However, if you notice a sudden increase in the intensity of the hum or if it is accompanied by other electrical issues, it is best to consult a professional electrician to ensure there are no underlying problems with your electrical system.