How Long is Impairment for Fire Pump Transfer?

11/18/2021

What are time delay intervals associated with a fire pump's energy source transfer?

Is a 2-minute wait time long enough before notating an impairment when the pump doesn't start operating at peak again after shutting down the main power on an annual pump test?

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2 Comments

Joshua Freedman

11/18/2021 12:08:23 pm

NFPA 25 only says it needs to work but doesn't say how long. You have to look at the electrical code which governs that apparatus, NFPA 70. Transfer from the normal power source to the emergency source must complete within 60 seconds and meet the requirements of Article 701 of the National Electrical Code (NFPA 70). Excerpt from NFPA 70 (2017) below:

III. Sources of Power
701.12 General Requirements. Current supply shall be
such that, in the event of failure of the normal supply to, or
within, the building or group of buildings concerned, legally
required standby power will be available within the
time required for the application but not to exceed 60 seconds.

Mark Harris

11/18/2021 04:23:04 pm

Great answer Joshua. Appreciate the detail.

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How Long is Impairment for Fire Pump Transfer?

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