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NOTE: This is an unformatted excerpt from our online fire protection training library.

Remote Station and Protected Premises Fire Alarm Systems

Combination Systems

Signal Precedence

When a fire alarm system is part of a combination system, fire alarm signals take precedence This changes with the introduction of systems used for mass notification. It can be argued that mass notification is a signal for the protection of life, but to increase emphasis on the importance of mass notification, when permitted by the risk analysis, any mass notification signal can take precedence over all other signals. over all other signals from any other part of the combination system.  The fire alarm system signals must be clear and distinctive, which is the same requirement for a non-combination fire alarm system.

Signals associated with life safety are the top priority, followed by signals associated with property protection.  Trouble signals associated with these two items are next in line, followed by all other signals, from any other system.

At any time, live voice signals can override any automatically initiated voice messages.  Once the voice system has been "capturedMany of these systems are multi-channel. This means that different messages can be sent to different areas or floors of the same building. This is done through programming in the fire alarm control unit. Multi-channel voice systems will use a console of switches that are controls for each individual paging zone. In the automatic mode, the fire alarm system will send a specific message to different areas, depending on how that specific area is impacted by the fire or incident. If an incident commander operates a switch to a specific area, he will be talking "live" to that area - he "captures" that particular paging zone, or zones." and is being used by incident commanders, for example, any message that would be automatically generated over the specifically captured channel is blocked.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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