In new construction, what happens when one smoke alarm activates in a living unit with multiple alarms?

When one smoke alarm activates in a living unit equipped with multiple alarms, the system is designed to ensure that all alarms activate simultaneously. This feature is critical for safety, as it enhances the chances of alerting all occupants of the living unit to a potential fire, regardless of where they are located within the space.

The interconnected nature of these alarms allows for a coordinated response, so if one detects smoke or fire, it communicates this to the others, effectively creating a networked warning system. This design principle is based on the understanding that a single alarm might not be loud enough to be heard throughout an entire home, especially if occupants are in different rooms or if there is ambient noise.

While the scenario could involve a situation where a single alarm is in distress, leading to an unclear alert process if the system were not interconnected, most modern codes and recommendations mandate that alarms within a living unit must work together to maximize safety and ensure that everyone is alerted in case of danger. The activation of all alarms serves as a means to notify all residents in a timely manner, which is crucial during emergencies when seconds can make a significant difference.