Can I interconnect smoke alarms and carbon monoxide (CO) alarms?

Only BRK CO alarms with a "smart interconnect" can be interconnected with smoke and heat alarms. The smart interconnect sends a unique signal for smoke and CO alarms on one interconnect wire. With non-smart interconnect CO products, no electrical hazard is associated with such a connection of CO and smoke alarms. However, homeowner confusion can arise when an alarm condition exists when these two devices are interconnected as they have different horn patterns.

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