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WIDE AREA AUDIBLE

Typically, wide area signalling alarm systems
such as horn loudspeakers or PA loudspeakers
consist of three individual sounders that are
pole-mounted at 120° to give full 360° coverage;
in order to minimise cabling costs, the systems
are often battery powered and are radio
controlled.

As well as providing wide area coverage,
such systems are often used on building and
construction sites, where they provide excellent
protection levels for the workforce. Typically,
the horn loudspeakers are initiated from radio
manual call points, either through a system of
master/slave control panels or directly if the
system is self-contained.

Mobility is a key feature, with the individual
units being moved around the site as the work
progresses. Wide area warning sirens and alarm
systems are particularly useful on a temporary
basis when construction work is being carried
out on large or congested sites or for more
permanent installations like those needing to
meet obligations under the Control of Major
Accident Hazard (COMAH) regulations.