Electric fire pumps must be supervised for which conditions?

• A. Loss of phase
• B. Phase reversal
• C. Pump running
• D. All of the above

Answer: (D)

Electric fire pumps are kept ready for a fire by continuously monitoring not only the electrical supply but also the pump’s actual operation. If a phase is lost in a three‑phase circuit, the motor can stall, overheat, or run erratically, so supervision is used to detect and alert on that condition. Phase reversal, where the wiring causes the motor to rotate in the wrong direction, can damage components and prevent correct pumping, so it also must be monitored. Additionally, pump running supervision checks that the pump actually starts and runs when it’s commanded; if it doesn’t start or stops unexpectedly, an alarm is triggered. Since all of these situations affect whether the pump will operate reliably when needed, every one of them is supervised. All of the above.