Final answer:
In commercial fire alarm systems, the annunciator typically sounds until manually silenced or reset, adhering to local codes and NFPA 72 guidelines.
Step-by-step explanation:
The duration for which an annunciator should sound in a commercial fire alarm installation before cutoff is typically defined by local building codes and fire regulations. It is crucial to refer to the specific codes and standards applicable in the jurisdiction where the system is being installed. However, the common standard is that the alarm should continue to sound until it is manually silenced or reset by authorized personnel, indicating that the situation has been assessed and addressed.
National Fire Alarm and Signaling Code
One widely recognized set of guidelines is provided by the NFPA 72, the National Fire Alarm and Signaling Code, which provides comprehensive rules regarding the installation, performance, and maintenance of fire alarm systems. This codebook is periodically updated to reflect the latest safety measures and technologies.