Based on the 2020 NEC. The grounding electrode provides the essential function of connecting the electrical system and electrical equipment to the earth. In some cases, the grounding electrode(s) ...
A. As per Sec. 250.32, a building supplied by a feeder must have a grounding electrode system and a grounding electrode conductor installed in accordance with Part III of Art. 250. Exception: A ...
The idea of linking buildings using CAT5 (or other copper cabling) comes up rather often. There is always a mention of grounding issues and then fiber is mentioned to get around these issues.
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