Advanced MX-4200V, Manual

Page: 66 / 72

66
5.8 Appendix 8
– Mx-4800V / Network Design Principles
This section gives recommendations on the design of the installation to cover specific EN54-2 requirements and
typical national codes of practice.
[EN54-2: 1997, Clause 13.7] Not more than 512 fire detectors and / or manual call points and their associated
mandatory functions shall be affected as a result of a system fault in the C.I.E.
5.8.1 Mandatory Functions
For full compliance with the requirements in EN54-2, the configuration and operation of all mandatory outputs
shall comply with the guidelines below.
Sounder Devices [EN54-2: 1997 Clause 7.8]:
Care should be taken with the cause and effect programming to ensure that any sounder / sounder output is
configured such that its fire response operation will only be affected if there is a system fault on the chassis /
panel to which it is directly connected.
Consideration should also be given to the applicable code of practice or national standard regulations for fire
systems installation (for example BS5839-1: 2002) for installation and operation of sounder devices.
Fire & Fault Routing [EN54-2: 1997 Clauses 7.9 & 8.9]:
Mx-4800V: If provided, then separate fire and fault routing interfaces should be provided on each chassis.
These should be individually configured to report fire and fault conditions from their respective chassis / panel.
Network: If provided, then at least two fire and fault routing interfaces should be provided. These should be
programmed to report all fire and all fault conditions.
5.8.2 Network Wiring
Where the installation design and codes of practice deem the network connections to be a 'Critical Signal Path'
then consideration should be given to the use of the
Fault Tolerant Network. For further
information see document 680-027.
In addition, the routing and type of cables employed is important to limit the risk of multiple failures causing
overall or partial loss of the network functions. BS5839-1: 2002 Sections 24-2 and 26.2 provide a useful guide.
— Use fire resisting
cables.
— Configure the
network as a loop.
— Employ diverse
routing of incoming
and outgoing
circuits, except in the
immediate vicinity of
the sub-panel.
— There is no loss of
communication to
any sub-panel in the
event of a single
open or short circuit
on the loop.
Detector Loop Wiring
www.acornfiresecurity.com
www.acornfiresecurity.com