Can any one tell me when we need to be concerned with the resistance to ground (earth) of a grounding electrode system in an industrial or commercial installation with system(s) operating less than 600 volts? It appears that the NEC is not concerned with it, however, it requires to connect the electrical system to ground with a specified grounding electrode conductor size as appropriate for the electrical service. The NEC goes on to say that you connect to earth in order to protect against lightning, line surges or accidental contact with the higher voltage as well as providing equal potential. With that said, the code is not concerned with the earth ground) resistance of the electrical system as it may be the industry as well as IEEE standards (80 and 81) practice for high voltage systems in substations. Any feed back on this topic is appreciated.
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