What type of ground test uses an auxiliary current electrode and an auxiliary potential electrode?

The three-point test is utilized to measure ground resistance accurately by employing both an auxiliary current electrode and an auxiliary potential electrode. In this testing method, a current is injected into the ground through the auxiliary current electrode, and the voltage drop is measured across the ground by the auxiliary potential electrode. This configuration allows for the calculation of ground resistance using Ohm's law, as the current and resulting voltage can provide insight into the resistance of the grounding system.

The three-point testing method is advantageous because it minimizes the effects of any parallel ground paths and ensures that the measurements reflect the actual ground system's resistance. It is a preferred method in various applications, providing a more precise assessment of the grounding system compared to simpler testing methods, like the one-point test or two-point test, which may not offer the same reliability or accuracy in results.

Understanding this context is crucial for professionals working with grounding systems, as accurate measurements are essential for ensuring safety and compliance with electrical codes.