Where is the second start switch wired on a circuit motor starter?

The second start switch is wired in parallel with the coil of the motor starter to allow for a control circuit that can help maintain the operation of the motor once it is started. When the first start switch is activated, it energizes the coil, which then closes the contact and allows current to flow to the motor.

Having the second switch wired in parallel means that once the coil is energized, the motor can continue running independently of the first start switch, allowing the second switch to act as a means to restart the motor without needing to reset the first switch. This configuration is essential for creating a latching mechanism, where the circuit remains closed and the motor stays running even if the initial start switch is released.

This wiring setup is a typical practice in motor control circuits, ensuring that control operations are efficient and can be managed from multiple points. Serialization of the first switch would not provide this functionality and placing it in a separate circuit would result in a lack of control connectivity. Wiring in line with the motor would also not create the necessary conditions for sustaining the motor's operation after the initial activation.