What is the typical secondary voltage for distribution transformers?

The typical secondary voltage for distribution transformers primarily serves the purpose of delivering power at levels that are suitable for residential and commercial use. Among the options provided, the combination of 480, 240, and 120 volts is widely recognized as standard secondary voltage levels in distribution systems.

480 volts is often used for three-phase distribution to larger commercial or industrial customers, while 240 volts is commonly seen in residential applications, especially in certain parts of North America, where it provides adequate voltage for large appliances. On the other hand, 120 volts is the standard for general household light and outlet use. Thus, this choice reflects the variety of voltages that are typically encountered in practical distribution scenarios.

In contrast, the other options either include voltages that are not standard in distribution applications or fail to represent a common assortment of voltages used in practice. Therefore, the selection highlighting 480, 240, and 120 volts accurately represents the voltage levels used in the context of distribution transformers.