EN 54-25-2008 pdf download.Fire detection and fire alarm systems-Part 25 : Components using radio links.
The following influences are not covered:
C) random influences as a result of electromagnetic effects, because these are covered by EMC guidelines (see EN 50130-4);
d) deliberate attacks on the radio controlled transmission paths with the help of electromagnetic effects (sabotage via the radio controlled route), because no special sabotage resistance Is required for fire alarm systems in the parts of EN 54.
4.2.5.2 Availability of RF link in two or more technically similar systems coming from the same manufacturer
In the case of two or more technically similar systems coming from the same manufacturer operating within the radio range it shall be ensured that the RF links do not mutually impede one another.
The manufacturer shall specify the means. The means shall be suitable to ensure the availability of all parts of the system in all expected system configurations.
The test shall be carried out in accordance with 8.2.6.
4.2.5.3 AvailabilIty of the RF link in the presence of other band users
The manufacturer shall take measures to ensure that signal transmission is possible even if other users are working in the same band.
These measures shall ensure that an external user who uses the maximum permitted limits in the assigned band or sub-band, such as bandwidth and duty cycle, does not cause interference.
NOTE The definition in EN 300220-1 V 1.3.1:2000 apphes for establishing the duty cycle.
The test shall be carried out in accordance with 8.2.7.
4.2.5.4 integrity of the RF link
The application of one of the interfering RF signals defined in 8.2.7 to one of the FDAS receivers shall cause
neither an alarm condition nor a fault warning condition at the CIE.
4.2.6 Loss of communication
The loss of the ability of the system to transmit a message of any RF linked component to the CIE within in EN 54-2 defined periods shall be recognized in less than 300 s and shall be indicated in less than 100 s.
The test shall be carried out in accordance with 8.2.8.
venfied by visual inspection or engineenng assessment, shall be tested as described in Clause 8 and shall meet the requirements of the tests.
5.2 General
5.2.1 All components shall meet the requirements of the relevant part of EN 54 and the following additional specific requirements. including the transmission paths and/or radio links.
5.2.2 The component shall be designed such that any non-destructive dismantling is detected and indicated as a fault.
5.2.3 Components that rely on software control in order to fulfil the requirements of this specification shall comply with the relevant part of EN 54.
5.3 Power supply equipment
5.3.1 The components shall be powered by:
a) an autonomous power source, e.g. a primary battery, or
b) a power supply equipment In accordance with EN 54-4.
NOTE In accordance with EN 54-2 a CIE Is powered with power supply equipment complying with EN 54-4,
5.3.2 All components powered by an autonomous power source shall comply with the following requirements:
a) the autonomous power source shall be within the enclosure of the component;
b) the autonomous power source shall allow normal operation of the component for a minimum period of 36 months.
The manufacturer shall declare the type of the autonomous power source and its service life for the component in normal operation. The service life shall be demonstrated by a statement of calculation. This calculation shall take into account the mean consumption and voltage under quiescent and at standard atmospheric conditions. The product of the specified discharge time of 36 months and the mean discharge current shall not be greater than 85 % of the rated capacity of the power source.
NOTE The remaining 15 % of the rated capacity takes into account of self discharge of the power source. The mean consumption shall be calculated based on the electronic element of the circuit.
Where calculation is not practical, the mean consumption shall be measured at nominal voltage for at least 1 h under quiescent operation after the stabilisation period given by the manufacturer.EN 54-25-2008 pdf download.