Secondary power shall automatically provide power to a protected premises system within how many seconds...

NFPA 72 specifies a strict timeframe for the automatic switchover tosecondary powerafter loss of primary power.

NFPA 72 (2022), Section 10.6.7.1.2:

“Transfer to secondary power shall occur within 30 seconds after loss of primary power.”

This ensures uninterrupted monitoring and alarm functions during outages.

Correct answer: B. 30

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