What should be used when a step potential exists between a steel tower and high resistance earth?

Utilizing an insulated mat is the most effective choice when a step potential exists between a steel tower and high resistance earth. Step potential arises when there is a potential difference in voltage across the ground surface, particularly in areas where electricity may be involved, such as near high voltage equipment.

An insulated mat provides an extra layer of safety by effectively isolating individuals or equipment from the ground beneath them, thereby reducing the risk of electric shock that could occur from stepping into a zone of differing electric potential. Insulated materials are designed to prevent the flow of electrical current, protecting personnel from hazardous conditions caused by the step potential.

Grounding wires, rubber gaskets, and metal barricades are less effective in this specific scenario. Grounding wires are typically used to direct stray currents safely into the earth and do not address the immediate concern of a step potential in the vicinity of a person. Rubber gaskets are not intended for safety in high voltage environments and may not effectively mitigate the risk of step potential. Metal barricades could inadvertently create additional hazards by being conductive and do not provide the necessary insulation from electrical hazards.