What type of system is secondary in a 120/208 power bank?

In a 120/208 power bank, the secondary system is typically configured as a Wye system. This configuration allows for both three-phase and single-phase connections, providing versatile options for distribution and utilization of electrical power.

In a Wye setup, the phase voltage is 120 volts to ground, which corresponds to the 120V requirement, while the line-to-line voltage measures 208 volts, which is the output that can be utilized for three-phase loads. This system also enhances the balance of loads across phases, improving efficiency and stability.

The Wye configuration provides a neutral point that can be grounded, which is essential for safety in electrical systems, allowing for the connection of devices that require lower voltages. This grounding helps to mitigate faults and enhance operational safety.

In contrast, other configurations like Delta do not provide a neutral point and typically have different voltage distributions that would not achieve the typical 120/208 output for secondary distribution systems. Single-phase and three-phase terms refer to the type of power and number of phases rather than the specific configuration of the transformer bank. Thus, the Wye setup is the most appropriate and functional choice for achieving the voltage levels indicated in a 120/208 power bank.