Which action requires re-acceptance testing after changes to a fire alarm system?

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When a fire alarm system is changed, you must perform re-acceptance testing to confirm the entire system still meets code requirements and functions correctly with the modifications. A visual inspection won’t catch hidden wiring faults, detector interactions, or signaling issues. Checking only batteries and wiring confirms power and basic connections but not how the system operates as a whole. Replacing detectors is a modification, but without re-acceptance testing there’s no formal verification that the updated system still performs to spec. The re-acceptance test is the formal step that revalidates the entire system after changes, ensuring proper detection, signaling, and overall reliability.