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Siemens
Installation guide RXB, RXL
CM110381en_01
Building Technologies
Periphery wiring (without bus)
28 Feb 2009
Very good:
Stranded cable with solid coverage
Sufficient: Foil
screens
Insufficient: Vaporized
screening
No equipotential bonding current may flow over the cable screen.
The absence of equipotential bonding may be required within the same zone or
floor. In case of doubt or for connection over larger distances, e.g. between various
buildings, the one end of the cable is connected to the structure galvanically, the
other capacitive.
Condenser: Self-correcting metal foil condenser ca. 100 nF, min. 250 V.
Do not breach required wiring cross sections.
The
bus wire (KNX, PPS2)
cannot be wired in parallel to increase the cross
section. Parallel wiring is, however, permitted for power, valve actuators and
analog signals, e.g. temperature sensors.
Cable cross section