Lightning Protection Zones Of A Building - Siemens CPU 313C Hardware And Installation Manual

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Direct lightning strikes occur in lightning protection zone 0. Lightning strike
generates high-energy electromagnetic fields which can be reduced or eliminated
from one lightning protection zone to the next by suitable lightning protection
elements/measures.
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In lightning protection zones 1 and higher, a lightning strike might additionally
cause overvoltage as a result of switching operations, coupling etc.
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The figure below shows a block diagram of the lightning protection zone concept
for a detached building.
External
lightning
protection
Line in
power
system
Figure 12-6 Lightning protection zones of a building
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
Lightning-protection zone 0 (field side)
Lightning-protection zone 1
Lightning-prot. zone 2
Lightning-
protection
zone 3
Device
Metal
part
Line in information system
Building shield
(Steel reinforcing)
Room shield
(Steel reinforcing)
Device shield
(Metal casing)
Non-electric
line (metallic)
Internal
line
Lightning-
protection equal
Local potential
equal
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