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Main types of Fire Alarm System: Part2

Posted 23-03-18

There are five main types of fire alarm system. Each will have its own application within the design process, and the correct identification for the most appropriate system is critical to ensuring buildings get the best possible active fire detection system installed. The five categories can be split up as conventional fire alarm systems, two-wire conventional systems, addressable systems, aspirating smoke detection systems and radio controlled fire systems. In the last blog, we took a look at entry level conventional systems – today we move onto Hybrid Two-wire conventional systems.

Hybrid Two-wire conventional system:

A two wire fire alarm system is a more advanced conventional system, where the fire alarm operates on a radial circuit. Two-wire systems eliminate the need to separate the sounders and detection devices operating to an EOL in a similar way to a conventional system.

The advantages of a two-wire system over a conventional system is the significant reduction cabling required as the sounder circuits and detection circuits can be combined. This also allows for the introduction of combi-units such as smoke detectors with sounder bases etc.

The disadvantages remain broadly similar to that of a conventional system, with a high volume of cable still being required, and a relatively low intelligence within the system, preventing specified feedback or a distinction between fault and alarm. Alarm and Fault signals can also only be identified zonally rather than device specifically.

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