In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 5 reads line voltage, while the voltmeter reading between 2 and 5 reads 0 VAC. What is most likely the problem? Illustration EL-0007

Correct Answer: Option B — an open stop switch contact (when not pushed in)

Voltage between points 1 and 5 confirms power supply, while 0 VAC between points 2 and 5 indicates an open circuit directly upstream of point 2, which corresponds to an open or unclosed normally closed stop switch contact.