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  • Public address and general alarm system ( PA/GA )

A+B

Article: 00102608

Public address and general alarm system ( PA/GA )

Description

Where the alarm and voice broadcast (PAGA) system is intended to provide vital life safety/dependant instruction/warnings a fully duplicated A+B configuration is implemented. The intent is that a single fault, no matter how catastrophic, shall not inhibit the reliable distribution of alarm and voice broadcast to all potential listening positions. The duplicated PAGA package is arranged such that there is no possibility of common mode failure and design obviates cross transference of possible fault conditions from one sub-system to the remaining working sub-system.

Each compartment is fitted with loudspeakers assigned separately to A and B PAGA subsystems. The areas where ambient noise exceeds 84 dBA A and B flashing beacons should be fitted. The two sub-systems are strictly segregated with central panels remotely located from each other. Cables extending from the panels to field devices follow separate routes utilising differing transits, cable race ways, racking and tray work, additionally all cables are mechanically protected.

Specifications

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