General Requirements for Marine Emergency Alarm System
The general emergency alarm system shall be capable of sounding the general emergency alarm signal consisting of seven or more short blasts followed by one long blast on the ship’s whistle or siren and additionally on an electrically operated bell or klaxon or other equivalent warning system, which shall be powered from the ship’s main supply and the emergency source of electrical power required by regulation II-1/42 or II-
1/43, as appropriate.
1. The system shall be capable of operation from the navigation bridge and, except for the ship’s whistle, also from other strategic points.
2. The system shall be audible throughout all the accommodation and normal crew working spaces.
3. The alarm shall continue to function after it has been triggered until it is manually turned off or is temporarily interrupted by a message on the public address system.
4.The minimum sound pressure levels for the emergency alarm tone in interior and exterior spaces shall be 80 dB (A) and at least 10 dB (A) above ambient noise levels existing during normal equipment operation with the ship underway in moderate weather. In cabins without a loudspeaker installation, an electronic alarm transducer shall be installed, e.g. a buzzer or similar.
5. The sound pressure levels at the sleeping position in cabins and in cabin bathrooms shall be at least 75 dB (A) and at least 10 dB (A) above ambient noise levels as regulated in A.830(19).