50
en | Installation wiring
PRAESENSA
2021.12.21 | V0.15b | F.01U.402.882
Underwriters Laboratories Listing Document (ULLD)
Bosch Security Systems B.V.
3.5.6
Lifeline
The lifeline is required for UL2572 to meet the backup time requirements and is a cable
connection between a PRAESENSA amplifier and a PRAESENSA multifunction power supply.
This interconnection serves multiple functions:
–
Lifeline audio routing (backup audio signal for the connected amplifier in case its netwerk
interface or both network links would fail).
–
Not required for UL2572. This backup audio signal is optional and allowed to be used
in a UL2572 compliant system.
–
Lower power consumption during mains absent.
–
Required for UL2572 compliancy.
(MPSx)
To create a lifeline connection, follow the procedure below.
1.
Crimp ferrules E onto the ends of the electrical wires of cable G to provide a solid and
reliable electrical connection.
–
Use a dedicated crimping tool.
2.
Insert each wire into the appropriate slot of the connector C. The wiring order is not
critical, but use the same order for all lifeline cables in the system to minimize the risk of
errors.
–
Use a flat blade screwdriver to tighten each connection.
3.
Insert the cable connector into the amplifier's lifeline socket, cut the cable to length and
mount a connector of the same type, delivered with the multifunction power supply to
the other end of the cable, observing wiring order. Insert this connector into the lifeline
socket of the multifunction power supply.
