Direct buried cable collects ground strikes within a distance typically determined by soil resistivity.

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Multiple Choice

Direct buried cable collects ground strikes within a distance typically determined by soil resistivity.

When a ground strike occurs, the surge travels through the soil and induces voltages in nearby buried conductors. How far that influence reaches depends on how easily the soil conducts electricity — soil resistivity. In practice, the zone where a buried cable can couple significant energy from a ground strike is relatively small, typically about 2 to 6 meters. If the soil is more conductive, the radius can increase somewhat, but it generally stays within a few meters; if it’s very resistive, it shrinks. Distances like 0.5–1 m are usually too small to capture the common coupling range, while 10–20 m or 50–100 m would imply a much larger area of influence than what is typically observed.

When a ground strike occurs, the surge travels through the soil and induces voltages in nearby buried conductors. How far that influence reaches depends on how easily the soil conducts electricity — soil resistivity. In practice, the zone where a buried cable can couple significant energy from a ground strike is relatively small, typically about 2 to 6 meters. If the soil is more conductive, the radius can increase somewhat, but it generally stays within a few meters; if it’s very resistive, it shrinks. Distances like 0.5–1 m are usually too small to capture the common coupling range, while 10–20 m or 50–100 m would imply a much larger area of influence than what is typically observed.

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