In this episode, E&S Grounding Solutions President David Stockin continues looking at an example of lightning striking a large metal tower. The connection between electrodes and earth will determine the potential difference across the ground, so it is important to understand what causes the potential difference and why engineers should work to minimize that difference. The formation of electromagnetic fields and step and touch voltages are other factors to consider in the design and analysis of a grounding system. Mitigations are possible by adding copper wire, copper ground ring(s), and electrodes that are specially-designed to help dissipate leakage current. Many of the principles applying to a large metal tower could apply to other structures.
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