Siemens Simatic S7-1500 / ET 200MP - Page 157

Wiring
7.3 Operation on grounded infeed
Automation system
156 System Manual, 01/2023, A5E03461182-AK
Short-circuit and overload protection
Various measures as protection against short-circuits and overloads are required for setting
up a full installation. The nature of the components and the degree to which the required
measures are binding depends on the IEC (DIN VDE) regulation applicable to your plant
configuration. The table refers to the following figure and compares the IEC (DIN VDE)
regulations.
Table 7- 1 Components and required measures
Reference to follow-
ing figure
IEC 60364
(DIN VDE 0100)
IEC 60204
(DIN VDE 0113)
Shut-off device for control system, sen-
sors, and actuators
①
Main switch
Disconnector
Short-circuit and overload protection:
In groups for sensors and actuators
②
③
Single-pole protection of
circuits
• With grounded sec-
ondary circuit: fuse
unipolar
• Otherwise: fuse all
poles
Load power supply for AC load circuits
with more than five items of electromag-
netic equipment
④
Galvanic isolation by trans-
former recommended
Galvanic isolation by trans-
former recommended