5.1.2 The
general emergency alarm system is to be provided with an emergency
source of electrical power as required by Vol 2, Pt 9, Ch 2, 5.2 Emergency source of electrical power and Vol 2, Pt 9, Ch 2, 5.3 Starting arrangements and
also connected to the main source of electrical power with automatic
changeover facilities located in, or adjacent to, the main alarm signal
distribution panel. Failure of any power supply is to operate an audible
and visual alarm, see also
Vol 2, Pt 9, Ch 3, 8.10 Cable support systems 8.10.6.
5.1.3 The
general emergency alarm distribution system is to be so arranged that
a fire or casualty in any one main vertical zone other than the zone
in which the crew and embarked personnel address control station is
located, will not interfere with the distribution in any other such
zone.
5.1.4 There
are to be segregated cable routes to crew and embarked personnel rooms,
alleyways, stairways, and control stations, so arranged that any single
electrical fault, localised fire or casualty will not cause the loss
of the facility to sound the general emergency alarm in any crew and
embarked personnel rooms, alleyways, stairways, and control stations,
be it at a reduced capacity.
5.1.5 Where
the special alarm fitted to summon the crew – operated from
the navigation bridge, or fire-control station, forms part of the
ship’s general alarm system, it is to be capable of being sounded
independently of the alarm to the passenger spaces.
5.1.7 Sound
signal equipment, fire and general alarm bells are to be supplemented
by visual indications in areas having high levels of background noise,
such as machinery spaces.