What does a orange wire mean in smoke alarm detector?

In smoke alarm systems, an orange wire typically indicates a connection for a secondary function, such as an interconnect feature or a specific signaling function. This wire can be used to connect multiple alarms so that when one alarm detects smoke, all interconnected alarms will sound. However, wire color codes can vary by manufacturer, so it's essential to consult the specific installation manual for the smoke alarm being used for accurate information.