Design criteria for systems to remain operational after a fire casualty
2 Purpose
The purpose of this regulation is to provide design criteria for systems required to remain operational for supporting the orderly evacuation and abandonment of a ship, if the casualty threshold, as defined in regulation 21.3, is exceeded.
3 Systems*
3.1 In case any one main vertical zone is unserviceable due to fire, the following systems shall be so arranged and segregated as to remain operational:
.1 fire main;
.2 internal communications (in support of fire-fighting as required for passenger and crew notification and evacuation);
.3 means of external communications;
.4 bilge systems for removal of fire-fighting water;
.5 lighting along escape routes, at assembly stations and at embarkation stations of life-saving appliances; and
.6 guidance systems for evacuation shall be available.
3.2 The above systems shall be capable of operation for at least 3 h based on the assumption of no damage outside the unserviceable main vertical zone. These systems are not required to remain operational within the unserviceable main vertical zones.