Nate Electrical Practice Exam 2025 - Free Electrical Practice Questions and Study Guide

Large motors commonly use a delta connection due to its ability to handle high power levels and deliver the necessary torque for starting and sustaining motor operation.

In a delta configuration, each motor winding is connected end to end, forming a closed loop. This arrangement allows for a higher voltage across each winding compared to other configurations, which results in improved efficiency in power delivery. The delta connection also provides a reduced current per winding, thus lowering the heating effect during operation, which is particularly beneficial for large motors that can draw substantial current.

Additionally, when starting large motors, the delta connection can handle the initial inrush current better than some alternatives, thus preventing excessive voltage drops in the system. While the star connection offers advantages for starting motors at reduced voltage, it is not as effective for continuous operation at high loads. Similarly, parallel and series connections are not viable for the high-power requirements typical of large motors in industrial applications.