Bosch Plena Installation And User Instructions Manual page 110

Plena Voice Alarm System | Installation and User Instructions | IEC60849
IEC60849 - 4.4 Safety requirements
table 5: IEC60849 - 4.4 Safety requirements
Requirement
The safety requirements applying to
emergency sound systems are given in
IEC60065 or other appropriate IEC safety
standards.
The mechanical construction of the system
shall be such that under the influence of
internally generated heat, explosion or
implosion, however caused, no part shall
cause injury to any person.
Where any part of the system is installed in
areas with hazardous or explosive
atmospheres, the relevant safety requirements
of IEC60079 shall be met.
IEC60849 - 5. System technical requirements
IEC60849 - 5.1 Speech intelligibility
table 6: IEC60849 - 5. 1 Speech intelligibility
Requirement
Unless otherwise specified, the following
requirement shall be satisfied:
The speech intelligibility over all of an area of
coverage (see 3. 1 ) shall be greater than or
equal to 0,7 on the common intelligibility scale
(CIS). See annexes A and B for the conversion
between CIS and other scales of intelligibility.
The noise level (see B.5) at the time of
measurement (but in the absence of the test
signal) and the test signal level shall be stated
with the test result
NOTE -
If the persons who are required to understand
the messages are, or will be, reasonably
familiar with them through regular system tests,
the effective intelligibility tends to increase by
approximately 0,05 on the CIS if the
intelligibility is in the range 0,6 to 0,7. This may
apply, for example, in an office building.
However, in a sports ground, for example, most
of the messages are likely to be relatively
unfamiliar to the majority of persons present
and no relaxation of the above requirement
should be considered.
The system specification may exclude from the
area of coverage, defined areas rarely or never
occupied by people.
Bosch Security Systems | 2006-06 | 9922 141 10377 en
Compliance
Compliant. The Plena Voice Alarm System
complies with IEC60065.
Compliant.
Responsibility of the installer. The Plena Voice
Alarm System equipment itself does not comply
with IEC60079.
Compliance
Responsibility of the installer.
Responsibility of the installer.
en | 110
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