My guess is that it's either too tight entrance conductors (wind vibration similar to guitar strings being plucked) or the conductor bracket has loosened over time.
In either case, YOU MUST CALL a professional to correct the problem. Theses conductors are not protected by any over current protection and are being fed at nearly 300 volts, ac, p-p. (240 volts RMS but your body will feel the full 295 volts). Any contact will result in *****.
Try talking to your local utility to start.
Testimonial: "Sorry I did not make myself clear- this is a one inch diameter cable coming from the unit in the attic and feeding the outside air conditioning unit. It does meet up with electrical cables toward the bottom.They are attached to the outside of the house with brackets and screws."
Sorry, misunderstood. Electrical cables that are secured properly, that hum and vibrate, are ""usually"" leaking current to ground.
As you described it. I would have concerns about cable deterioration, allowing some current to leak to a grounded surface. Not always, but its s known condition. And a concern. Current leaking from a conductor under these circumstances can cause localized heating on the adjacent surface and lower its kindling temperature. Under certain circumstances this can cause a fire to start.
I know it's expensive, but I would recommend you have a local electrician take a look at the problem; if for no other reason, piece of mind.
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