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These balls called "warning ball" or "marker ball" have 2 main tacks on power lines: First they can used as a sign in order to avoid contacting between air transporter vehicles and power lines, Second in some cases there are many power lines in a specific way and the colour of these balls can show the level of voltage for repairing mans.
These balls (marker balls) are placed on conductors so that electrical conductors are visible to planes and helicopters to avoid any type of accident . They are often found in hilly areas and near mountains.
They’re called visibility marker balls or marker balls. You’ll often find them near mountain passes, in the deep valley areas, near major freeway crossings and around airports. They weight about 17 pounds each.
The marker balls are placed on power lines to make the conductor crossings visible to aircraft. Helicopters and small aircraft often fly low in mountain passes or freeways and usually fly low while approaching an airport.
When you are flying, the conductors and skyline become almost invisible against the terrain—especially the skyline wires.
Many of the marker balls are required by the Federal Aviation Administration (FAA), like the ones near airports.
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