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Bi-Wire (2-Wire) Alarm Systems

Bi-Wire systems are based on standard conventional system technology, but in addition incorporate additional functionality to enable the callpoints, detectors and the sounders for each separate zone to be wired on a single common circuit.

This enables the control panel to use a single circuit per zone both for detection and to power the sounders. Even though the panel continually powers the sounders, control functionality incorporated within the sounders enables them to only be activated in the event of a fire alarm condition. By combining both the detection and the alarm annunciation wiring into a single circuit, considerable savings in installation time and cabling can be achieved.

Although adding Bi-Wire technology to the detectors and the sounders does slightly increase the equipment costs this is normally more than offset by savings in installation cost.


The Sabre Pro Bi-Wire conventional fire alarm system incorporating the Multipoint combined smoke & heat detectors with built in sounder means the whole system can be installed using only two wires.


Two-wire AlarmSense has been developed to make the design and installation of a fire detection and alarm system easier and more economic for small to medium sized buildings. The range also allows an existing system to be extended or modified if necessary.