Rules For The Interfaces Between Lightning Protection Zones 0 And 1 - Siemens SIMATIC ET 200iSP Operating Instructions Manual

Appendix
A.5 Lightning and overvoltage protection
A.5.3

Rules for the interfaces between Lightning Protection Zones 0 and 1

Rules for the lightning protection zone transition 0
bonding)
For lightning protection equipotential bonding at the interface of lightning protection zone 0
1, the following applies:
• No introduction of lightning component currents into the plant in hazardous areas.
Sufficient clearances of conductors and cables through which lightning current passes and
that are fed into hazardous areas.
• Define the zone transition 0
Note
Since this zone transition is not relevant for the typical applications of the ET 200iSP, this will
be discussed in no further detail in this manual.
Rules for the lightning protection zone transition 0
For overvoltage protection at the interface of lightning protection zone 0
applies:
• Use of power cables with peak current-capable cable shields (e.g., NYCWY) or twisted-pair IT
cables (for example, A2Y(K)Y).
• Laying cables and lines
– In continuous, peak current-capable metal pipes that are grounded at both ends, or
– In reinforced concrete channels in which the reinforcement is grounded at both ends, or
– On closed metal cable racks that are grounded at the beginning and end.
• Use of fiber optic cables without a metal shield if such a transmission is intended.
Other measures
If the actions listed above cannot be performed, protection by means of overvoltage suppressors
must be provided. The following table contains overvoltage suppressors that may be used to
protect facilities.
We recommend that the overvoltage suppressors for the signal cables and the 24 V supply be
integrated into an appropriate enclosure according to the specifications of the manufacturer of
the overvoltage suppressor. See "Enclosure specifications" in the section "Application example
for protection of ET 200iSP from overvoltages (Page 449)".
Note
To ensure the availability of a cable connection using overvoltage protection, both ends of the
cable must be connected to overvoltage suppressors.
446
to 1 (lightning protection equipotential
A
to 1 in the non-hazardous area.
A
to 1 (strong electromagnetic couplings)
B
Operating Instructions, 11/2022, A5E00247483-AK
to
A
to 1, the following
B
ET 200iSP