Why is a Protected and Filtered Ground Important?
During a surge event, all the wires bundled in a cord-set or in conduit are so close together that the magnetic field generated by a surge on one wire emanates to the adjacent wires. This is called inductive coupling and is the principle that makes radio broadcasting possible. Without filtering and protection on all 3 wires, components are vulnerable to surge energy traveling on ground as well as the other wires.

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