CAN BUS network
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Network (across several buildings) with CAN bus converter CAN-BC/C:
Maximum cable length: subject to the set Baud rate CAN-BC/C
The screen of the
disconnected
network is connected at each BUS converter to CAN BUS earth
(GND). This screen must
not
be
directly
earthed.
Without CAN BUS surge arresters
, this version only protects against potential differences
up to
1 kV
, therefore cannot be considered as lightning protection.
The best solution is the use of CAN BUS converters CAN-BC/L and connection via a fibre-optic con-
ductor, as these neither create electromagnetic interference nor surges.
Routing BUS cables underground
The cable should be routed at a depth of at least 0.8 m (below the frost level) and at least 30 cm clear
of other cables, preferably inside a conduit.
According to the SEP principle, all cables (power, data, etc.) should enter the building at a single point
in order to avoid potential differences.
No equipotential bonding currents must flow across the BUS screen.
Consequently the screen must only be linked into the equipotential bonding of a
single house
(ex-
ample: network (across several buildings
without
CAN-BC).
In other houses this must be done
indirectly
via gas discharge arresters.
min. 0.8 m
Building 1
Building 2
Ground
Conduit
Screened BUS cable
Equipotential bonding rail
Indirect earthing
indirect earthing
indirect earthing
indirect earthing
optional
