5
16 | 42
Protective zone Position Impact on system Measures
Zone 2 Within 'zone 1'
● The lightning partial currents are
reduced by protective zone 1.
● The electromagnetic field is
attenuated by shield 2.
Depending on the
protection concept, the
device housing or an
extra shield represents
a protective zone limit.
Zone ...n
Other nested
protective zones
within 'zone 2'
● The lightning partial currents drift
towards zero.
● The electromagnetic field is reduced
to a minimum (almost 'EMC clean'
room).
● Protective zone limits minimize
repercussions on the function units.
Additional measures
prevent a spread and/or
influence, e.g. through
an "EMC pit" around an
oscillator.
Table 1: Table showing position of protective zones
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