Networks are always growing. As additional hardware is added, eventually the input power source, whether it is a UPS system or a generator-supported wall outlet, will become overloaded. Once overloaded, circuit breakers will trip, causing network downtime. Metered PDUs provide a practical way for managers to enhance availability by preventing overload. Metered PDUs offer the same features as basic PDUs, with the addition of a digital load meter. The meter allows network managers to locally view the total power consumption (in amps) of equipment connected to the PDU. As equipment is added, managers can see the increased load and take proactive steps to increase input capacity (with the addition of more or larger UPS systems or additional utility circuits). Tripp Lite metered PDUs are available in single-phase configurations (single-phase in and single-phase out) in a variety of voltages.