Server racks must be grounded to ensure electrical safety, prevent equipment damage from power surges, and mitigate electromagnetic interference (EMI). Proper grounding creates a low-resistance path (≤5 ohms per NEC 250. Bonding (or grounding) is a system of protective measures, which is implemented to prevent electric shocks when touching metal parts of energy-powered equipment. The whole structure consists of a metal circuit, a protect bus, and a ground wire. Network hardware is connected to PDUs and constantly. Therefore racks, cabinets, and other metal components in the data center should be bonded to the grounding system to reduce the risk created by electrical surges.