Rules For The Interfaces Between Lightning Protection Zones 1 And 2 And Higher - Siemens SIMATIC ET 200iSP Operating Instructions Manual

Appendix
A.5 Lightning and overvoltage protection
Note
For all other PROFIBUS DP components outside the hazardous area, we recommend the
procedure described in the manual PROFIBUS SIMATIC NET
support.automation.siemens.com/WW/view/en/1971286).
Note
If you use surge protection devices, the equipotential bonding should be installed using a
minimum cross section of 6 mm
A.5.4

Rules for the interfaces between lightning protection zones 1 and 2 and higher

Rules for the lightning protection zone transition 1 to 2 (strong electromagnetic couplings)
For overvoltage protection at the interface of lightning protection zone 1 to 2, the following
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.
• Creation of local equipotential bonding at the transitions of lightning protection zones,
including metallic supply systems (pipes, ventilation ducts, cable ducts, cable trays, etc.) and
electrical line and cable installations.
Other measures
If the actions listed above cannot be performed, protection by means of overvoltage suppressors
must be provided if unshielded electrical wiring and cable systems are routed within a lightning
protection zone. See table "Components for the overvoltage protection" in section "Rules for the
interfaces between Lightning Protection Zones 0 and 1 (Page 446)".
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)".
Overvoltage suppressors at lightning protection zone transition 2 --> and higher
When installing the ET 200iSP, the zone transition 2 --> and greater is usually not applied.
448
Cu.
2
Operating Instructions, 11/2022, A5E00247483-AK
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ET 200iSP