To reduce risks associated with misinterpretation of visual and
auditory danger Signals, this International Standard specifies a
System of danger and information Signals taking into account the
different degrees of urgency.
This International Standard is applicable to all danger and
information Signals which have to be clearly perceived and
differentiated as specified in ISO/TR 12100-2:1992, 5.3, by other
requirements or by the work Situation, and to all degrees of
urgency - from extreme urgency to an ALL CLEAR Situation. Where
visual Signals are to be complementary to Sound Signals, the Signal
Character is specified for both.
This International Standard does not apply to certain fields
covered by specific Standards or other conventions in forte
(international or national); in particular, fire alarms, medical
alarms, alarms used in the field of public transport, navigation
Signals and Signals for special fields of activity (for example,
military). When new Signals are being planned, however, this
International Standard should be considered in Order to avoid
For auditory Signals, the System of Signal Character is a
guideline for a Signal language based on message categories which
are classified according to urgency. Certain characters are
specified for purposes which require safe and rapid recognition.
Certain categories allow possibilities for variants, e.g. control
and warning Signals at workplaces where the signalling is intended
for personnel with specific training.
For visual Signals, the established meanings of the safety
colours are not affected by this International Standard. For
different needs, complementary meanings have been assrgned to the
Signals by timed Patterns, and in a very few cases by alternating
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