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Fire Alarm Conventional

What is a Conventional Fire Alarm System?

A conventional system employs one or more initiating circuits, connected to sensors (initiating devices) wired in parallel. These sensors are devised to decrease the circuits resistance when the environmental influence on any sensor exceeds a predetermined threshold. In a conventional system the information density is limited to the number of such circuits used. At times, a floor plan of the building is often placed near the main entrance with the defined zones drawn up, and LEDs indicating whether a particular circuit/zone has been activated. Another common method is to have the different zones listed in a column, with an LED to the left of each zone name.

The main drawback with conventional panels is that one cannot tell which device has been activated within a circuit. The fire may be in one small room, but as far as emergency responders can tell, a fire could exist anywhere within a zone. The same applies to coded panels, which nowadays are no longer made, but can be found in old systems. These, if the decision is made to keep them, are "grandfathered" in under NFPA regulations.

Advantages of Conventional Fire Alarm System:

  • Cost effective for small applications.

  • Low-cost fire alarm devices.

  • Simple to use.

  • Ideal for small buildings

Disadvantages of Conventional Fire Alarm System:

  • Not suitable for larger projects.

  • Fires and faults are only shown in a zone and not an exact location.

  • Possibly, more cabling than an addressable system.

Conventional fire alarm system wiring diagram/connection

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