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User and Installation Manual
Compact MPA
5 INSTALLATION PROCEDURE
5.1 INTRODUCTION
5.1.1 PA CONFIGURATION, CARGO VESSELS
Compact MPA system installations onboard cargo vessels, where GA is not integrated into the PA system have no require-
ment for duplication.
All loudspeaker loops shall be arranged as closed loops.
5.1.2 PA CONFIGURATION, PASSENGER VESSELS
Compact MPA system installations onboard passenger vessels are required to be duplicated in order to minimize the effect of
a single failure. The duplicated equipment (Compact MPA) must be separated and located in different fire zones.
The loudspeaker loops from each system shall be segregated throughout the ship and shall be arranged as closed loops.
5.1.3 PA/GA CONFIGURATION, ALL VESSELS
For cargo vessel installations where GA is integrated into the PA system as a combined PA/GA system the requirement for
duplication is the same as for PA systems onboard passenger vessels as described in section.
5.2 INSTALLATION GUIDE
5.2.1 PLANNING
The installation should be planned in detail before commencing. Sound pressure levels and the number of loudspeakers must
be decided upon. The cables should be listed in a cable plan, with the number of pairs etc. The location of each unit in the
communication system should be planned to obtain maximum performance and user availability.
5.2.2 GENERAL
The main requirement of a GA / PA system is to achieve sufficient coverage and sound pressure level (SPL) for alarms and
PA messages to be heard throughout the installation. The number of loudspeakers, their types (power rating) and tapping
determine the coverage and sound pressure.
The minimum requirement during normal operating conditions for GA is 80dBA and at least 10dBA above the ambient noise
level in both interior and exterior spaces. In the cabins sleeping positions and bathroom the minimum requirement is 75dBA
and at least 10dBA above the ambient noise level.
For PA (Emergency PA) the minimum figures are 75dBA and at least 20 dBA above the speech interference level for interior
spaces. For exterior spaces the minimum requirement is 80 dBA and at least 15 dBA above the speech interference level.