Smaller Spheres
The balls that dangle a little closer to the ground—say, less than 50 feet above where you stand—may only be 20 inches in diameter. These are distributed in a less liberal manner than their larger equivalents.
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Power companies have separated these red balls according to their sizes. They also assign specific intervals to each type of red ball. Smaller spheres can be as close as 30 feet apart, while larger spheres can be as far apart as 200 feet.