Conventional Type Fire Alarm System

Fire alarm systems fall broadly into two groups — conventional systems or analogue addressable systems.

Conventional fire alarm systems, in their various forms, have been around for many years and have changed little in that time in terms of technology, although design and reliability have improved significantly. Conventional systems are a well-proven technology protecting many hundreds of thousands of properties worldwide, and are often the natural choice for smaller systems or where budget constraints exist.

How a conventional system works

In a typical conventional fire alarm system the intelligence of the system resides solely within the fire alarm control panel, which receives a trigger signal from a conventional detector or call point and, in turn, signals the condition to other devices such as alarm sounders and remote signalling equipment.

Conventional detectors are normally connected to the fire control panel via dedicated circuits, each circuit protecting a designated zone or area of the building — the maximum size of which will often be governed by local standards. Detectors have two states: normal and alarm. The fire control panel will normally be arranged in a set number of zones or circuits, for example 1, 2, 4 or 8, and have two separate sounder circuits.

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