What kind of feeder configurations typically have a common neutral?

Feeder configurations that have a common neutral are often found in both single-phase and three-phase systems. In single-phase systems, the common neutral provides a return path for current and is essential for balancing loads, particularly in residential wiring where devices may not always draw equal current. This is especially important in split-phase systems where two hot conductors share a neutral conductor.

In three-phase systems, a common neutral is used when there is an unbalanced load. The neutral helps to provide a return path for the unbalanced portion of the load and ensures that the voltage remains stable across the three phases. This configuration is critical in commercial and industrial applications where varying loads can create imbalance.

By allowing both single-phase and three-phase systems to utilize a common neutral, the design supports efficient operation and helps to minimize the total amount of copper required, as fewer conductors may be needed. Thus, both types of systems can efficiently share a neutral conductor, making it an integral part of their design, which supports the answer that both types of feeder configurations typically have a common neutral.