What distinguishes "240/120" from "120/240" on a transformer nameplate?

The designation "240/120" on a transformer nameplate indicates that the transformer can provide two different output voltages, specifically 240 volts or 120 volts. This configuration consists of two separate coils within the transformer. The two coils are often configured in such a way that one operates at 240 volts while the other operates at 120 volts, allowing flexibility in delivering power to various applications.

In this arrangement, the transformer can step down voltage for residential or commercial use, where 120 volts is commonly used for standard electrical outlets and 240 volts might be used for larger appliances. The use of two separate coils is essential for achieving this versatility and maintaining safe and effective voltage levels.

This distinction is important because it highlights how transformers can be designed to meet different voltage requirements based on the load needs of the connected circuit. Understanding these configurations helps linemen ensure proper installation and functioning of transformers in the field.