Why? The resistance of the ground determines how effectively your grounding system can dissipate high-voltage surges into the earth. However, according to data from the insurance industry, failure to properly ground communications systems has led to $500 million of property or equipment damage annually due to lightning or surges. But where did the voltage come from and how are you limiting it?Īs the Figure shows, you bond metal parts of an electrical system together and then ground the bonding system to earth to limit the voltage-to-ground - thus preventing destruction of electrical components as well as electric shock that can occur from superimposed voltage from lightning and voltage transients. This concept seems simple: Connect metal parts of an electrical system to the earth to limit the voltage-to-ground on the metal parts. Conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected to earth so as to limit the voltage to ground on these materials. A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes.Īlso review the requirement that states in part: A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth. To better understand the concept of equipment grounding, you should review two NEC definitions in Art.
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