Thefunctional test of the primary power supplyensures that the fire alarm system responds properly to a loss of power and transitions to secondary power.
NFPA 72 (2022), Table 14.4.3.2 — Test Methods and Frequencies:
Primary power supply is required to be testedannually, which equates toevery 12 months.
Correct answer: D. Every 12 months
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