Q: Is it required to dropped power to your electric driven fire pump while it is running to ensure it starts back up and continues to run on emergency power?
A: If you are referring to the annual fire pump flow test, the answer is yes. Section 220.127.116.11 of NFPA 25-2011 requires a simulated power failure while the pump is operating at peak capacity (150% of nameplate capacity) and confirm that the fire pump continues to operate at peak capacity under EM power. This means a second set of pitot readings are necessary while the pump is operating on EM power at peak capacity. Check with your contractor who conducts this test. Surprisingly, many contractors who perform the annual fire pump test fail to include this procedure.