What are the ball shapes for on some power lines?

Question

I always see these ball shapes (orange or white) across power lines but only in some locations.

Answer 1

Good question. I'd like to know the answer too.

I thought they were to help contain the electromagnetic field effects around the wires......like the small 'nodules' on some computer cables. Those are iron magnets I believe, which help reduce the field effects of those cables from interfering with the wires near by. I still tend to think this is what they are for, but if someone has an answer....I'd like to hear it.

Answer 2

They are so big birds don't land on the lines and get zapped.

Answer 3

So low flying aircraft, like crop dusters, can see the lines.

They are only in locations that are likely to have low flying aircraft.

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