What are the big orange balls on power lines?

Answer

The big orange balls found on some high power lines are designed to alert lower flying aircraft of the presence of these lines. Typically, these warning balls often are fashioned out of aluminum. In some cases, they are red in color.

The big orange balls placed on high power lines serve three primary objectives. First, the contribute to aviation safety by alerting aircraft (and their crews and passengers) of these potential hazards. Second, these warning balls protect expensive high power lines and related equipment from damage. Finally, these balls work to protect the power supply to a neighborhood or community.

Reference:
Q&A Related to "What are the big orange balls on power lines?"
They are called Wire makers for warning small private airplanes
http://www.chacha.com/question/what-are-the-big-or...
In some areas they are for preventing the power lines from hitting together and starting a fire. They also increase the visibility of the lines to helicopters etc.
http://wiki.answers.com/Q/What_are_those_orange_ba...
The large red balls that sit on power lines in the middle of the country are primarily meant to help airline pilots see the lines to avoid running into them. The balls are often found
http://www.ehow.com/info_8461804_red-balls-power-l...
They are to warn aircraft about the electric line. I am sure you are seeing these when they are are in a flight path or at least near an airport, right?
http://answers.yahoo.com/question/index?qid=200902...
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The red balls on the power lines are markers and are usually placed in areas where there isn't much else around. They help airplane pilots see the power lines. ...
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