Ground rods are the primary way of making a grounding connection to earth ground from electrical equipment. The very basis of electrical systems stems from the ability of the grounding connections to catch and funnel away harmful electricity so that us, as consumers, are not subjected to electrical shocks and dangers.
...Source: http://electrical.about.com/b/2013/09/10/ground-rods-a-down-to-earth-connection.htm
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