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1.3
Fire detection system line network
1.3.1
Separate line network
1.3.2
Design
1.3.3
Wiring material
1.3.4
Existing line networks
1.3.5
Explosion hazard areas
1.3.6
Electromagnetic influence (EMI)
Fire & Security Products
Siemens Building Technologies Group
The fire detection system must be basically operated via a separate line network. The
common use of a main cable (e.g. PTT) is not recommended.
Never use low voltages and extra low voltages in the same main cable.
According to block diagram.
Maintain separation of low voltage and extra low voltage cables.
Basically, standard telephone and extra low voltage installation material can be used.
Twisted cable is preferred and is sometimes essential.
In order to ensure alarm activation in any situation, we recommend cables which are fire-
resistant over a longer period.
These networks can be basically used if capacitances, line and insulation resistances
comply with the data specified.
For explosion-hazard areas, comply with the guidelines according to document e1204,
«Fire detection in explosion-hazard areas».
All equipment is largely protected against EMI.
Nevertheless, the following precautions are necessary:
Maintain the greatest possible distances from thyristor control cables, high voltage
lines, lightning protection systems, transmitter cables etc.
5
e1453b
12.2001
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