SC Lightning Protection Practice Questions - South Carolina Lightning Protection Systems Contractor Examination Exam

Why is conductor impedance more important than DC resistance when routing a lightning down conductor?

Lightning is a high-frequency impulse, so inductance and the rate of current change (L di/dt) dominate voltage drop DC resistance is always zero in copper The NEC requires impedance, not resistance, on all grounding electrodes Impedance only matters on aluminum conductors

Correct Answer:

Lightning is a high-frequency impulse, so inductance and the rate of current change (L di/dt) dominate voltage drop

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