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Definition of "Ground Rod" |
An earth electrode subsystem installed by the responsible facilities engineering activities at each facility to provide a low resistance path to earth for lightning and power fault currents and ensure that hazardous voltages do not occur within the facility. This subsystem shall be capable of dissipating to earth the energy of direct lightning strokes with no ensuing degradation to itself. This system shall also interconnect all driven electrodes and underground metal objects of the facility. The earth electrode [Ground Rod] subsystem shall not degrade the quality of signals in the signal circuits connected to it. The rods shall be interconnected with a 1/0 AWG (American Wire Gage) bare copper cable buried at least .45m (1.5 feet) below grade level. Larger size cables as well as greater burial depths shall be specified where earth and atmosphere considerations so dictate. / a metallic, rod-type electrode designed to be driven into the earth. It serves as an earth connection for grounding purposes. Other types of earth electrodes include buried plates, rings, and grids. For buildings, its primary function is to keep the entire grounding system at earth potential. |
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