Siemens CERBERUS AlgoRex Series Installation Manuallines page 14

1.3.9 «Interactive» detection lines
10
Fire & Security Products
Siemens Building Technologies Group
«Interactive» detection lines can be installed as stub or loop lines. According to equip-
ment configuration, a maximum of 100 or 128 fire detectors can be connected to a loop
line and a maximum of 32 fire detectors can be connected to a stub line (regulations).
Branch lines can be connected to the detector bus direct.
New systems: Twisted cable, minimum 7 turns per metre.
With powerful EMI: Twisted cable, minimum 10 turns per metre.
With extremely powerful EMI: Shielded and twisted cable
Existing systems: Takeover of existing wiring possible, with certain remaining risk that a
part would have to be replaced.
Line resistances and line capacitances see document e1508, «Connection factors, line
resistances, capacitances».
Type of cable
Twisted, min. 7 turns
Twisted, min. 10 turns
(generally preferred cable)
Shielded, twisted
min. 10 turns
Non-twisted
Shielded/non-twisted
Upper level
Ground floor
CT..
Basement level
Fig. 8 Block diagram «interactive» detection system
Application
Essential in areas where EMI is not critical
e.g. offices, hotels, homes, museums, computer rooms etc.
Essential in areas where EMI is critical
e.g. X-ray rooms, radar systems, transmitter stations, proximity to
thyristor controls etc.
Essential in areas where EMI is extremely critical
e.g. in the vicinity of thyristor controls, high voltage etc.
Utilization of cable from existing systems with minimum remaining
EMI risk, if necessary with written protection for critical parts
Not recommended for new systems
Utilization of cable from existing systems with minimum remaining
EMI risk, if necessary with written protection for critical parts
Not recommended for new systems
L3
24V
DC1154
L2
24V
DC
24V
DC1154
2
FDC 1,5mm
CC1140
L1
24V
DC1154
DC1192
È È È È
SB
Ex
È È È È
240V~/10A
e1453b
12.2001