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Shield earthing
To ensure maximum protection from EMC interference*, Indirect shield earthing by means of DEHNrapid arresters
both ends of cable shields must be connected to the equi- can be implemented as follows: On the one end, the cable
potential bonding system. If systems with a different earth shield is connected to an earthing plug and is thus directly
potential, for example two buildings with insufficient equi- earthed. On the other end, the cable shield is connected to a
potential bonding, are connected via the cable, a significant disconnection block with integrated gas discharge tube, thus
equalising current may flow though the cable shield, thus preventing equalising currents. In case of lightning strikes or
interfering with the data signal to be transmitted. Therefore, surges, the gas discharge tube establishes a direct connection
cable shields are earthed directly on one end and indirectly to the earth potential and prevents that the connected
on the other end by means of a gas discharge tube which is devices are interfered with.
connected to earth potential. This indirect shield earthing pre-
vents equalising currents during normal operation.
LSA disconnection block LSA disconnection block
LSA disconnection block LSA disconnection block
for indirect shield earthing
LSA mounting frame 9 9 LSA mounting frame
LSA earthing plug LSA earthing plug
Indirect and direct shield earthing
* EMC: Electromagnetic compatibility 7
