Earthing Conductors PVC Covered Tinned Copper Tape serves as a perimeter electrode installed to the outer edges of the foundation in direct contact with the soil and connected to the switchgear earth bars. This tape is typically used as LV-HV electrodes for standard earthing arrangements on ground-mounted LV MV HV substations. It is safe to use. Due to its high conductivity, anti-corrosive qualities, and versatility for use in air, earth, and concrete, copper is employed for the majority of earthing installations.