106 en | Plena Voice Alarm System
9922 141 1037x (V2.16) | V0.6 | 2011.09 Installation and Operation manual Bosch Security Systems B.V.
5. System technical requirements
c Switching on or off, of selected loudspeaker
zones.
Compliant, if properly installed. Manual
selection of loudspeaker zones is
supported. Adding or removing zones
from a running call is supported.
d Broadcasting of live messages via the
emergency microphone (if any).
NOTE - The above controls may form part of
an emergency detection control panel.
Compliant, if properly installed. Live calls
from an emergency call station are
supported.
The emergency control microphone shall have
the highest level of priority for access to the
voice alarm system, with provision to allow it to
override all other broadcasts.
Compliant.
4.4 Safety requirements
The safety requirements applying to emergency
sound systems are given in IEC60065 or other
appropriate IEC safety standards.
Compliant. The Plena Voice Alarm System
complies with IEC60065.
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.
Compliant.
Where any part of the system is installed in areas
with hazardous or explosive atmospheres, the
relevant safety requirements of IEC60079 shall
be met.
Responsibility of the installer. The Plena
Voice Alarm System equipment itself
does not comply with IEC60079.
Clause / Requirement Compliance Signature
5.1 Speech intelligibility
Unless otherwise specified, the following
requirement shall be satisfied:
The speech intelligibility over all of an area of
coverage 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.
Responsibility of the installer.
Clause / Requirement Compliance Signature
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