The
consequence this that ever more opposing influ-
ences (electromagnetic interferences) can occur from
system parts and cables, causing damage and eco-
nomic losses.
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Chapter The internal lightning protection system
. Foil shields are particularly
effective high frequencies, whereas braided shields
are better suited low frequencies.4 Cable shielding
Cables are shielded with foil braided shields, or
combinations the two. recent years, the use electronic circuits has
increased continually. Whether industrial systems,
medicine, households, telecommunications systems
or electrical building installations everywhere there
are powerful electrical equipment and systems, which
switch ever greater currents, achieve greater radio
ranges and transport ever more energy smaller
spaces.
However, the use state-of-the-art technology means
that the complexity applications also increases.g. creating
an indirect earth connection via gas-discharge pro-
tector, normal operation, the cable shield insu-
lated one end.1. large coupling occurs, the poten-
tials can equalised through the ignited gas-dis-
charge protector. The measure of
shielding quality shown the shielding attenuation
or shielding level.
If, for technical reasons, e. order prevent Hz
ground loops, direct connection the cable shield
at both ends not possible, one end should be
earthed directly and the other indirectly. Existing cables can also shiel-
ded using earthed cable support metal pipe sys-
tems.3.TBS
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Mobile telecommunications mast SAS clamp clip connect the shielding braid with MDP
surge protection devices
3
