How many secondary windings does a 277/480 volt can have?

The correct answer indicates that a 277/480 volt transformer typically has one secondary winding. This configuration allows for proper voltage transformation necessary for various applications.

In this case, the primary winding is connected to a 480-volt line, while the secondary winding provides two available voltages, which are 277 volts for lighting circuits and 480 volts for heavier power utilization. The single secondary winding can tap into these two voltages based on the connection method used (for instance, using a wye or delta configuration).

The presence of only one secondary winding is crucial for efficient voltage transformation and maintaining balanced load distribution. Consequently, having two or more secondary windings would complicate the system unnecessarily in this specific transformer design, which is typically designed to fulfill specific voltage requirements without redundancy.