NICET Fire Alarm Systems Level I Pop Quiz #6 Answer

The secondary power supply shall automatically provide power to the protected premises system within ____________ whenever the primary power fails.
2018 NICET Fire Alarms Level I Study Guide
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[@StidePrince]

You the man I’m assuming this process will also work for the NFPA FIRE INSPECTOR 1 exam ? I took the Florida fire inspector 1 state board but new job requires NFPA as well