Data cable with shield
When laying the cable must ensured that the
shield connection continuous and earthed both
ends. Depending the coupling resistance the
cable and the shield cross-section, the shield may be
able withstand lightning current. cable shield that only earthed one end is
only effective against capacitive coupling. Shields that
are earthed both ends are additionally effective
against inductive coupling.
The cable the example connected both ends
so shielded against both capacitive and inductive
coupling.
Device 1
Device 2
Data cable
Shield connected both ends
Equipotential busbar
Earth connection
Cable shield earthed both ends
Transmitter
Data cable
Adjacent cable with potential difference
Parasitic capacitances
Interference currents
Interference-free signal
Shield for conducting interference currents away
Capacitive coupling onto the transmitter prevented the shield
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Chapter The internal lightning protection system
