Power, Signal And Control Cables - Bosch LA3-VARI-B Installation Manual

12 en | Installation
Power supply
The VARI base unit requires an AC mains supply. Its internal power supply is of the auto-
switching type, and will operate on voltages between 100 - 120 V or 200 - 240 V, at 50 or 60
Hz. It is equipped with power factor correction and has short circuit and over-temperature
protection. The installer should ensure that an AC mains supply of sufficient capacity is
available at the mounting location; note the peak mains power consumption in the table
below:
Configuration
VARI-B/BH
VARI-B/BH + VARI-E
VARI-B/BH + 2 x VARI-E
Warning!
The third terminal of the mains outlet must be connected to a proper safety ground.
!
Unpower the units during lighting storms or when unused for long periods of time, unless
special functions are to be maintained, such as for evacuation systems.
The VARI base unit (and thus any attached extension units) can also operate from a 24 V DC
power supply, and will automatically switch to this in the event of mains failure. This may be
sufficient to satisfy local safety regulations covering the use of sound systems in emergency
situations, but the installer should ensure that he/she is aware of the precise local
requirements in this respect. It may be necessary to provide a separate mains distribution
network or an uninterruptible mains power supply (UPS).
4.2

Power, Signal and Control cables

Since VARI loudspeakers will frequently be installed in locations which are difficult to access
readily, consideration should be given to the cables required at each mounting position. VARI
units will operate satisfactorily with just a signal input and the mains supply. However, some
installations will require further cables to be installed. It is recommended that all necessary
cables are run to the mounting location before the loudspeaker is physically installed. Note
that all external connections are made to the VARI base unit, at the bottom of the loudspeaker
column. Cable access is via a 37 mm diameter hole at the rear of the connector compartment.
Depending on local wiring regulations, it may be necessary for all cables to the VARI to be
contained in flexible conduit made of a material with a specific fire rating. A suitable bush to
terminate the conduit at the VARI will need to be fitted in the hole before the loudspeaker is
mounted in position.
Notice!
It will generally be necessary to mount the loudspeaker in position and feed the cables
through the rear cable access hole before the cables are terminated.
Connection
AC Mains supply
2018.06 | V1.3 |
Max. power
60 W
97 W
124 W
Required?
Always required
Installation manual
Idle power
18 W
23 W
28 W
Cable type Section
3-core mains cable AC mains supply,
page 13
Bosch Security Systems B.V.
VARI-directional array