What is the number of wires that are typically inserted into the ground in a common test setup?

In a common test setup for measuring soil resistivity or corrosion potential, two wires are typically inserted into the ground. This configuration allows for the accurate measurement of voltage and current, which is essential for assessing the corrosion control measures in place.

The first wire, often called the "current lead," is used to inject current into the soil, while the second wire, or "voltage lead," measures the potential difference that develops as that current flows through the soil. The use of two wires helps ensure that the measurements taken are reliable and reflect the actual conditions in the ground, as it minimizes errors that could arise if only one wire was used.

Having two wires allows for a more complete understanding of how the environment may be affecting the pipeline, making it a standard practice in corrosion testing and monitoring.