n the electrical trade, a voltage gradient is most often a difference in potential between places on the earth within a few feet. Also known as the 'step potential". This occurs when there is current flowing through the earth. The difference in potential is due to the voltage drop across the resistance of the earth. The higher the resistance, the higher the "step potential".
Grounding grids just below the earth like those used in substations or ag facilities will reduce the voltage gradient by reducing the resistance and the voltage drop.
Don(resqcapt19)
