The sizing of grounding conductors can be influenced by fault current availability and what else?

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Grounding conductor sizing is driven by the amount of fault current that could be available and the ability of the grounding path to carry that current safely until the protective device clears the fault. The other factor to consider is the grounding conductor itself—the size and material you choose. Copper and aluminum conductors have different resistances and current‑carrying and temperature ratings, so the minimum size is set not just by how much fault current there could be but by what the chosen conductor can safely handle. That’s why the grounding conductor’s own characteristics matter; they determine whether the path stays low impedance and will trip the protection quickly enough. Insulation thickness, wire color, and conduit size don’t determine the fault-path impedance or the conductor’s current-carrying capability in the same way, so they aren’t the primary factors in sizing the grounding conductor.