Plena Voice Alarm System System overview | en 33
Bosch Security Systems B.V. Installation and Operation manual 9922 141 1037x (V2.16) | V0.6 | 2011.09
3.12.2 Swimming pool
Swimming pools and other indoor sports and recreational facilities are typical examples of
smaller applications with few zones. The main priorities are excellent speech intelligibility and
compliance with IEC 60849 standard (and its national equivalents), although music in
different areas is optional. An EVAC system for a swimming pool requires voice alarm
functionality with public address functionality for regular announcements and background
music (optional). To ensure that all visitors in the relatively noisy pool area hear emergency
messages, the power output for that zone is relatively high. Other areas, such as the changing
rooms and offices, have lower power requirements.
Summary of requirements
– Typically up to 6 zones
– Speech intelligibility is the main priority
– High power requirement in the noisy pool area
– Fireman’s panel by fire exit
– Call station in office/reception
– Additional public address functions for announcements
–BGM
Solution for a 5-zone system
The Plena Voice Alarm System controller handles routing to up to 6 zones, so no additional
routers are required. The office/reception is equipped with a call station plus keypad for
individually addressing zones, while a fireman’s panel (with overall priority) is built in by the
emergency exit. The Plena Voice Alarm System is a two-channel system, so BGM can still be
provided in zones not receiving a call.
Power requirements
The system controller has a built-in 240 W power amplifier, making it possible to drive up to
40 loudspeakers with a power handling capacity of 6 W each. The pool area requires high
power music horn loudspeakers qualified for use in a high humidity atmosphere. The snack
bar uses cabinet loudspeakers for music reproduction. The zones are defined as indicated in
the table. An additional Plena Power Amplifier is used for two-channel operation and as a
spare amplifier.
Layout
See Figure 3.15, Table 3.3 and Table 3.4
Table 3.3 Zones
Zone Description Power
Z1 Indoor pool area 5 x 30 W
Z2 Children’s pool area 2 x 10 W
Z3 Changing rooms 4 x 6 W
Z4 Snack-bar 4 x 6 W
Z5 Office 2 x 6 W
Total 230 W
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