What is the minimum size grounding conductor for high impedance grounding systems?

The minimum size grounding conductor for high impedance grounding systems is indeed based on specific sizing guidelines dictated by standards. In this case, the correct answer states that the minimum size grounding conductor should be a 6 AWG for copper and an 8 AWG for aluminum.

This sizing is established to ensure sufficient grounding capacity in an electrical system, which is particularly important in high impedance systems where ground faults can occur. The chosen conductor sizes ensure that they can safely conduct fault current to clear any potential fault conditions without overheating or causing damage to the conductor itself.

Moreover, using these sizes provides an adequate measure of safety, allowing for effective fault detection and protection, which are crucial in maintaining system integrity and personnel safety. Grounding conductors that are too small may not carry enough fault current to trip protection devices effectively, leading to potential hazards.