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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | EN60849: 1998 en | 21
EN60849 - 5.6 Secondary power supply
In complex buildings in which actions, such as initiation
of evacuation signals, silencing of alarm signals, etc.,
can be implemented at remote voice alarm equipment,
consideration shall be given to whether there is a need
for such actions to be indicated at any central fire
detection and alarm control and indicating equipment.
Responsibility of the installer.
Requirement Compliance Signature
If the building is to be evacuated following primary
power failure, a secondary power supply shall be
provided. This shall be capable of operating the system
in the emergency mode for a period equal to twice the
evacuation time determined by the appropriate
authority for the building. In any event, the secondary
power supply shall be capable of powering the system
for a minimum of 30 min.
Responsibility of the installer.
If the building is not to be evacuated following failure of
the principal power supply, the secondary power
supply shall be capable of operating the system for at
least 24 h, or 6 h if an emergency generator is
available, and then powering the system in emergency
mode for a minimum of 30 min. If a building remains
unoccupied for several days, provision should be made
to ensure that the voice alarm system is capable of
operation in emergency mode for 30 min. when the
building is re-occupied.
Responsibility of the installer.
Non-emergency functions within the system, such as
background music, shall not operate from the
secondary power supply if this will reduce the capacity
for emergency operation.
Compliant if properly installed. Responsibility of the
installer.
If batteries are used as a secondary power supply they
shall be of the secondary type, complete with automatic
charging facilities. Where lead-acid batteries are used
they shall be of the valve-regulated type unless
otherwise specified, and the charging system shall
incorporate charging current compensation for
changes in the ambient temperature, where this is
necessary to achieve the specified battery life.
Responsibility of the installer.
Batteries shall be used in accordance with the
manufacturer's recommendations in order to achieve
their specified life, which shall be not less than four
years. The end of life shall be taken as the time when
deterioration to less than 80% of the rated ampere-
hour capacity (at the one-hour rate) has occurred.
Responsibility of the installer.
Automatic charging shall ensure that the batteries are
fully recharged to 80% of their maximum rated capacity
from the fully discharged state in a period of not more
than 24 h.
Responsibility of the installer.
Adequate ventilation and protection against corrosion
and dangers resulting from gases emitted by the
batteries shall be provided.
Responsibility of the installer.
Requirement Compliance Signature