The substation grounding system is an essential part of the overall electrical system. The grounding system includes all of the interconnected grounding facilities in the substation area, including the ground grid, overhead ground wires, neutral conductors, underground cables, foundations, and deep well. There are many parameters that have an effect on the voltages in and around the substation area. To provide a safe condition for personnel within and around the substation area, the grounding system design limits the potential difference a person can come in contact with to safe levels. The substation grounding system design should limit the electric current flow through the body to a value the fibrillation current. Overhead ground wires, neutral conductors, and directly buried pipes and cables conduct a portion of the ground fault current away from the substation ground grid and need to be considered when determining the maximum grid current.