How are thermal switches configured in a fire detection system?

In a fire detection system, thermal switches are configured in a parallel arrangement with each other, which allows for redundancy and ensures that if one switch fails, others can still function effectively. When they are wired in parallel, it allows each switch to operate independently. Consequently, if a thermal switch detects a certain temperature threshold indicative of a fire, it can trigger an alarm or an indicator light without relying on the status of other switches.

Additionally, these thermal switches are wired in series with indicator lights to provide a visual signal of activation. This configuration informs personnel of a potential fire condition by illuminating the lights when one of the thermal switches is activated. The combination of being in parallel with respect to each other and in series with the indicator lights is critical for effective fire detection and notification in aircraft for safety purposes.