The normal phase rotation pilot should be:

The normal phase rotation pilot should be:

• A. Off
• B. Not Installed
• C. On
• D. Reversed

Answer: (C)

Normal phase rotation means the three-phase voltages reach the motor windings in the proper order, driving the motor in the intended direction. The phase rotation pilot light being on shows that the rotation is correct and the system is in its normal operating state. If the pilot is off, it can indicate that the rotation isn’t confirmed as normal due to a fault, miswire, or power issue. Not installed means there’s no indicator to verify rotation at all, which isn’t acceptable for a safety-critical fire pump circuit. Reversed would indicate the phase sequence is incorrect, causing the pump to rotate the wrong way and fail to deliver water properly. Therefore, the normal, safe condition is for the pilot to be on.

Normal phase rotation means the three-phase voltages reach the motor windings in the proper order, driving the motor in the intended direction. The phase rotation pilot light being on shows that the rotation is correct and the system is in its normal operating state. If the pilot is off, it can indicate that the rotation isn’t confirmed as normal due to a fault, miswire, or power issue. Not installed means there’s no indicator to verify rotation at all, which isn’t acceptable for a safety-critical fire pump circuit. Reversed would indicate the phase sequence is incorrect, causing the pump to rotate the wrong way and fail to deliver water properly. Therefore, the normal, safe condition is for the pilot to be on.