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Routing cables
between buildings
Note
82 / 88
Siemens
Building Technologies
Variant 2 with surge arresters
With Alternative 2, the bus cable is protected with surge arresters and routed in a
metal conduit or duct which is part of the equipotential bonding system.
The minimum cross-section of the conduit or duct must be sufficient to allow a
substantial part of the lightning current to pass across it (min. cross-section: Cu 16
2
2
mm
, Al 25 mm
, Fe 50 mm
Surge arrester
(secondary protection)
Lightning arrester
(primary protection)
Bus
device
(room unit)
Piping (water)
Equipotential bonding rail
With Variants 1 and 2, a surge arrester must be installed as secondary on the bus
device closest to the entry to the building. In relation to the bus cable length, the
bus device should be installed some meters away from the lightning arrester, so
that the surge arrester is not also partly responsible for primary protection.
KNX bus communications
Appendix
2
).
External
lightning protection
Bus
PE
device
(controller)
Metal pipe / - duct
230/400 V
For internal use only
CE1P3127en
2013-04-08
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