4. At least in the following spaces general alarm is to be capable of being operated:

(1) Main control station;

(2) Drilling console;

(3) Navigating bridge (if any); and

(4) Fire control station (if any).

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303. Mud system level alarms

A suitable audible and visual alarm to indicate significant increase or decrease in the level of the contents of the mud pit is to be provided at the control station for drilling operations and at the

mud pit. Equivalent means to indicate possible abnormal conditions in the drilling system may be considered by the Society.

304. Ventilation system alarms

Ventilation system alarm is to be in accordance with the requirements in Ch 7, 205.

305. Public address

1. The public address system is to be a loudspeaker installation enabling the broadcast of messages into all spaces where personnel are normally present and muster stations.

2. It is to allow for the broadcast of messages from navigation bridge, central control room, emer- gency response centre, engine control room, ballast control station, jacking control station and drill-

ing console.

3. It is to be installed with regard to acoustically marginal conditions and not require any action the addressee.

4. It is to be protected against unauthorized use.

5. The minimum sound pressure levels for broadcasting emergency announcements are to be:

(1) In interior spaces 75 dB(A) and at least 20 dB(A) above the speech interference level; and

(1) In exterior spaces 80 dB(A) and at least 15 dB(A) above the speech interference level.

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