Calculation Method Using Faraday Cage Effects on Currents in Buildings Struck Directly by Lightning

The overvoltages generated in low-voltage equipment in a building struck by direct lightning are greatly affected by the electromagnetic phenomena caused by the currents flowing in the building structure and grounding lines. Therefore, it is necessary to estimate the current to evaluate such overvoltages accurately. In this article, we investigate a method for evaluating the currents flowing in the building structure and the protective earth line using a mathematical formula based on the electromagnetic phenomenon of the Faraday cage effect.