I. Introduction
A safe grounding design has the main objective of providing means to carry currents into the ground under normal and fault conditions without exceeding any operating and equipment limits or adversely affecting continuity of service [1]. During its operation, the grounding system (GS) has to assure that a person in the vicinity of grounded facilities is not exposed to the danger of critical electric shock. It is well known that, under normal conditions, grounded electrical equipment operates at near-zero ground potential. During a ground fault event, the flow of current into the ground causes potential gradients within and around the zone of influence of the GS. Protection against electric shock requires that GSs must guarantee to keep the touch voltage (TV) and step voltage (SV) to a safe permissible value.