Siemens FS20 - Safety; Safety instructions

Protective zones
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Building Technologies
Fire Safety
2016
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04
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04
Position of protective zones around buildings
The protective zone 0/E is actually located inside the building, but is assigned to
the outer area for consideration in the case of fire detection installations.
Figure 2: Example of protective zones on buildings
Protective zone Position Impact on system Measures
Zone 0/A Outside buildings
● Surge voltage has a direct and
unattenuated effect.
● A direct lightning effect is possible.
● No shielding from electromagnetic
field.
None
Zone 0/B ● The surge voltage is attenuated.
● No direct lightning effect.
● No shielding from electromagnetic
field.
External lightning
protection is installed.
Zone 0/C ● No dangerous step voltage.
Earthing network is
installed.
Zone 0/E
In building roof
(<0.5 m)
In inner wall area
(<0.5 m and above
20 m)
● No direct lightning effect.
● No shielding from electromagnetic
field.
Zone 1 In devices
In rooms
Neighboring 'zone 0'
● The lightning partial currents are
reduced and flow via surge protectors
or equipotential bonding lines.
● The electromagnetic field is
attenuated by shield 1.
Internal and external
lightning protection
measures are
coordinated and
installed. All cables
leading into the building
are included in the
lightning protection
equipotential bonding.
0,5 m
0,5 m
2
0
m
0
,
5
m
Zone 0/E
Zone 0
Zone 0/E
Zone 1
Zone 2Zone 2
Zone 1
Zone 2
Zone 1