Where is a run capacitor connected in a motor system?

In a motor system, the run capacitor has a critical role in improving the motor's efficiency and performance. It is connected across the start and run terminals of the motor. This placement allows the capacitor to create a phase shift in the electrical current, which enhances the starting torque and provides a better running efficiency during operation.

By connecting the run capacitor in this manner, it helps in optimizing the motor's performance by enabling smoother operation and reducing energy consumption. Additionally, the use of a run capacitor allows the motor to reach its operating speed more quickly and maintain that speed more efficiently during operation, which is essential for proper functioning in commercial refrigeration systems.

Other connections listed, such as placing a capacitor between ground and the power terminal or in series with the motor winding, do not serve the same purpose and could potentially interfere with the motor's operation. Thus, the correct answer highlights the standard configuration used in practice to ensure effective motor performance.