8.4.7 FAILURE / WARNING OUTPUTS
There are two dry closing contacts voltage for indicaon of failure and warning condions:
Power failure:
• Primary and Secondary mains power supply missing
• Backup power missing
Pass/Fail
General warning:
• No communicaon with user panel Pass/Fail
Remove power from “A” system. Ensure all alarms and paging operates sasfactorily on the “B” system.
Restore power on “A” system.
Pass/Fail
Remove power from “B” system. Ensure all alarms and paging operates sasfactorily on the “A” system.
Restore power on “B” system.
Pass/Fail
8.4.9 SOUND PRESSURE LEVEL
The major requirement of a GA / PA system is sucient coverage and sound pressure level (SPL) for alarms and PA messages
to be heard throughout the installaon.
The general alarm requirement are 80dBA and at least 10dBA above the ambient noise level in interior and exterior spaces. In
sleeping posions and cabin bathrooms the requirement is a minimum of 75dBA and at least 10dBA above the ambient noise
level.
Public address requrements in interior spaces, including sleeping posions and cabin bathrooms are 75 dBA and at least
20 dBA above ambient noise level. In exterior spaces the sound level should be atleast 80 dBA and at least 15 dBA above
ambient noise level.
In no cases should the sound level exceed 120 dBA.
To ensure this, the MPA 1600 system makes use of the industrial standardized 100 V line distribuon system. This is a
distribuon system that is based on a xed line level (100V) and where the loudspeaker output power is determined by
means of loudspeaker type and power tapping. Hence, each loudspeaker meeng this line specicaon is equipped with an
audio transformer with several tapping possibilies.
The sound pressure level in an installaon is a site dependant issue, and is determined by the amount, type and tapping of
the loudspeakers.
An installaon must be carefully planned to ensure sucient SPL gures
In order to approve or decline a GA / PA system installaon a full SPL-gure survey must take place subsequent to the
installaon and seng-to-work process.
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