A PSC is installed to do what?

A PSC, or Permanent Split Capacitor, motor is designed to remain in use while the motor is running. This type of motor incorporates a capacitor that helps create a phase shift, allowing the motor to start and run efficiently. Essentially, the capacitor remains in the circuit for both starting and running conditions, which enables the motor to operate smoothly and maintain steady performance during operation.

In contrast, other options focus on starting the motor or modifying performance characteristics. While PSC motors indeed provide some benefits regarding efficiency and performance, they are not solely geared towards just starting the motor or actively reducing power consumption. Therefore, since a PSC remains integrated and functional throughout the operating cycle, the primary purpose aligns with the answer indicating that it is designed to stay in use while the motor is running.