Amaster boxis a type of manual fire alarm box connected directly to a public emergency reporting system (typically a municipal or fire department network). NFPA 72 requires these to be testedannuallyto ensure they still properly send signals to the public system.
Method:"Manual operation and verification of signal receipt at the public communication center."
The test confirms the box functions mechanically and that the signal is received by the appropriate monitoring point (e.g., fire department dispatch).
Correct answer: D. Annually
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