What is a "high-leg delta" configuration used for?

A "high-leg delta" configuration is a specific type of three-phase electrical system that features an unbalanced configuration in which one phase, often referred to as the "high leg," carries a higher voltage compared to the other two phases. This setup is commonly used in certain industrial and commercial applications to supply both three-phase power and single-phase power from the same system.

The primary purpose of utilizing a high-leg delta configuration is to provide increased voltage on one leg, which allows for the efficient operation of equipment that requires both three-phase power for motors and single-phase power for lighting or other loads. The high leg typically offers a voltage that is higher than the standard phase voltage. This ability to deliver multiple voltage levels is crucial in environments where both types of loads are present.

This arrangement also helps manage the power distribution efficiently in facilities that have specific loads with varying voltage requirements. It's important for those working with electrical systems to understand these configurations to ensure proper setup and safe operation.