13 The flooding detection system and equipment
should be suitably designed to withstand supply voltage variation
and transients, ambient temperature changes, vibration, humidity,
shock, impact and corrosion normally encountered in ships. Sensor
cabling and junction boxes should be suitably rated to ensure operability
of the detection system in a flooded condition. In addition, the detection
system should be designed on the fail-to-safety principle, where an
open sensor circuit should result in an alarm condition.footnote
14 The flooding detection system should be continuously
powered and should have an automatic change-over to a stand-by power
supply in case of loss of the normal power supply. Failure of the
normal power supply should be indicated by an alarm.footnote