The equipotential bonding box is used in buildings to establish equipotential connections, ensuring that all exposed conductive parts of electrical and other equipment, along with metallic conductive components within the structure, are connected via conductors to either artificial. The equipotential bonding box is used in buildings to establish equipotential connections, ensuring that all exposed conductive parts of electrical and other equipment, along with metallic conductive components within the structure, are connected via conductors to either artificial. Equipotential bonding is an electrotechnical safety measure. It eliminates potential differences and prevents dangerous touch voltages by bringing all conductive parts of a building to almost the same electrical potential. This protects people from electric shock and protects equipment or systems. This guide explains the theoretical principles and practical implementation of measures for equipotential bonding and lightning protection of PV systems in general – and of S:FLEX mounting systems in particular – based on the relevant technical regulations. The guide is largely based on the. Protective equipotential bonding is different from supplementary bonding. Supplementary bonding is the practice of connecting two conductive simultaneously accessible parts together to reduce the potential difference between the parts.