The Earth wire only carries current during a fault in electrical equipment, which is typically brief until the main fuse blows. The ground acts as a large conductor, dissipating any current over a vast area, making it undetectable under normal conditions. Normal wiring does not produce significant currents in the Earth wire that can be felt. However, downed power lines can create dangerous situations, and it is advised to maintain a safe distance of 30-50 meters. Understanding these principles clarifies why we don't feel current from the Earth wire under normal circumstances.