What is a multiple station detector?

A multiple station detector refers to a system where several smoke detectors are interconnected in such a way that when one detects smoke, it triggers all units within the system to sound an alarm simultaneously. This interconnection provides an added layer of safety, ensuring that occupants are alerted, regardless of their location in the structure.

In this context, the correct choice describes a system where these detectors are mains powered, meaning they draw power from the building's electrical supply. This is crucial because it reduces dependency on battery power which can fail over time; however, it can often have battery backup as well to maintain functionality in case of a power outage. The ability to sound alarms together enhances the effectiveness of detecting fire across larger or complex spaces, which is essential in fire safety protocols.

Options that suggest independently operating smoke detectors, whether battery powered or otherwise, do not fulfill the definition of a multiple station detector, as they lack the linking system that provides simultaneous alarm activation required for a collective response. Similarly, standalone fire alarm panels that do not connect to other devices do not align with the concept of interconnected multiple station detectors, as those systems depend on a network of interconnected units for a coordinated alert.