D-1 Lightning-Protection Zones Of A Building - Siemens SIMATIC S5 Manual

Lightning strikes Direct lightning strikes occur in lightning-protection zone 0, producing
and overvoltages high-energy electromagnetic fields that must be reduced or dissipated by
suitable lightning-protection elements/measures as they pass from one zone
to the next.
In lightning-protection zones 1 and higher, overvoltages may occur as the
result of switching operations, coupling operations, etc.
Lightning-
Fig. D-1 is a schematic showing the concept of lightning-protection zones as
protection zones: it applies to a free-standing building.
schematic
External
lightning
prot.
Line in
power
system
Figure D-1 Lightning-protection zones of a building
Principle of the At the interfaces between the lightning-protection zones, you must provide
interfaces between
measures to prevent or hinder the passage of overvoltage surges.
the lightning-
The principle of establishing lightning-protection zones also requires that all
protection zones
lines capable of carrying the lightning pulse between the lightning-protection
zones be included in the potential equalization system for lightning
protection.
Lines capable of carrying the lightning pulse include:
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
The ET 200 distributed I/O system and lightning protection
Lightning-protection zone 0 (field side)
Lightning-protection zone 1
Light.-prot. zone 2
Metal
part
Line in information system
metal pipes (e.g. for water, gas and heat)
cables in power systems (e.g. mains supply, 24 V supply)
and
cables in information systems (e.g. bus line)
Light.
prot.
zone 3
Device
Internal
line
Light. prot. potential equal.
Local potential equal.
Building
shield
(steel re–
inforcing)
Room shield
(steel re-
inforcing)
Device shield
(metal casing)
Non
electric
line
(metallic)
D-3
D