What low side rating would typically have three or four bushings?

The low side rating typically seen with three or four bushings is commonly associated with the 120/240 voltage configuration. In this configuration, the 120/240 system is a split-phase system that commonly utilizes three bushings: one for the neutral and one on each leg of the split-phase. However, if designed for certain applications, it could accommodate an additional bushing for grounding or other purposes, leading to the possibility of having four bushings.

Understanding the purpose of the bushings is crucial. They serve as points of connection for the transformer windings to the external circuits. In a residential setting, the use of the 120/240 rating is prevalent as it allows for connecting both 120-volt and 240-volt devices, making it versatile for various applications.

As for the other voltage ratings mentioned, they typically do not utilize three or four bushings. For instance, a 240/240 configuration often uses only two bushings since it is single-phase without a neutral, while the 120/60 and 480/240 configurations follow different setups for their bushings based on the specific system design and application. Therefore, the usage of three or four bushings is most accurately aligned with the 120/240 low