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Definition of "rolling ball" |
a method of determining the lightning protection to nearby structures afforded by a tall, well-grounded structure like a steel tower. Ashpere with a radius of 45 meters is imagined rolled against the tower. Any structure which can fit within the space defined by the sphere’s point of contact with the earth, the base of the tower, and the sphere’s point of contact with the tower is considered to be protected by the tower against lightning strikes. |
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