Appendix
S7-300 Programmable Controller Hardware and Installation
11-20 A5E00105492-01
Lightning-protection zone 0 (field side)
Ligtning-prot. zone 2
Ligtning-protection zone 1
Line in information system
Line in
power
system
Internal
line
Metal
part
Lightning
-prot.
Zone 3
device
Lightning-
protection equal
Local potential
equal
Building shield
(Steel reinforcing)
Room shield
(Steel reinforcing)
Device shield
(Metal casing)
Non-
electric
line
(metalic)
External
lightning prot.
-
Figure 11-6 Lightning protection zones of a building
Principle of the transition points between lightning protection zones
At the transitions points between lightning protection zones, you must take
measures to prevent surges being conducted downstream.
The principle of the lightning protection zone conception also specifies that all
cables which are capable of carrying lightning current (!) and installed at the
transition points of lightning protection zones must be included in the equipotential
bonding system.
Conductors and cables capable of carrying lightning current are:
• Metal pipes (e.g. water, gas and heat)
• Power cables (for example, mains voltage, 24 V supply)
• Data cables (for example, bus cable).
11.3.3 Rules for the transition point between lightning protection
zones 1
Rules for transition point 0 <-> 1 (Lightning protection equipotential bonding)
The following measures are suitable for lightning protection equipotential bonding
at the transition between lightning protection zones 0 <-> 1:
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