Note
For all the other PROFIBUS DP components outside the hazardous area, we recommend that
you follow the instructions in the PROFIBUS SIMATIC NET (
support.automation.siemens.com/WW/view/en/1971286
Note
If you use overvoltage protection devices, the equipotential bonding should be installed using
a minimum cross section of 6 mm
2
.
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 (e.g. 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 a local equipotential bonding at the transitions of lightning protection zones,
with incorporation of metal supply systems (pipes, air ducts, cable ducts, etc.) and electrical
wire and cable systems.
Other actions
If the actions listed above cannot be performed, protection by means of overvoltage
suppressors must be provided, if unshielded electrical wire and cable systems pass within a
lightning protection zone. See Table "Components for overvoltage protection" in Chapter Rules
for the interfaces between Lightning Protection Zones 0 and 1 (Page 359) .
We recommend that three 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. Refer to the "Enclosure specifications" in Chapter Application
example for protection of ET 200iSP from overvoltages (Page 362).
Appendix
A.5 Lightning and overvoltage protection
ET 200iSP
Operating Instructions, 11/2017, A5E00247483-07
361