2.1 The systems should readily identify the routes
of escape when the normal emergency lighting is less effective due
to smoke.
2.2 The systems should be such that, in case one
exit may not be used, persons are still able to easily find their
way towards another exit.
2.3 Systems relying on external power sources,
including those that are automatically activated or continuously operating,
should be capable of being manually activated by a single action from
a continuously manned central control station.
2.4 Electrically powered systems should be connected
to the emergency switchboard required by regulation
II-1/42 of the 1974 SOLAS Convention, as amended, so as to
be powered by the main source of electrical power under normal circumstances
and also by the emergency source of electrical power when the latter
is in operation.
2.5 All electrically powered systems should be
arranged so that the failure of any single device, or battery will
not result in the system being ineffective.
2.6 The systems should not prevent effective communication
between the fire-fighting parties and the continuously manned control
station.
2.7 The performances of the systems should not
be impeded by the simultaneous functioning of any other systems, expected
to be used in normal or under emergency conditions (e.g. public address
systems, emergency lighting systems, etc.).