GE IC693CHS397 Slot base module
Content introduction
(k) Structures greater than 150-feet (46 meters) above earth or above a lower air terminal shall determine the zone of protection to be the space in the vertical plane between points of contact and under the sphere when the sphere is resting against a vertical surface of the structure and the lower air terminal or earth. The zone of protection shall be limited to the space above the horizontal plane of the lowest air terminal unless it can be extended by further analysis, such as in rolling the sphere to be tangent to earth. (2) To provide effective protection, it is of utmost importance that a low-impedance path to ground exists. This applies to all components and connections from the air terminals to the grounding electrodes.
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