Potential equalisation refers to the electrical connection that all but equalises conductive bodies (e. g. casing, housings, mounting plates, etc.), electrical operating equipment, and foreign, conductive parts with earth potential. A protective measure, potential equalisation ensures that the contact voltage encountered during a fault is very minimal and cannot cause accidents. Potential equalisation must be compatible with high frequencies and low resistance. Equipotential bonding strips also serve as an earth reference point for electronic open-loop control systems.