Siemens SIMATIC S7-400 Hardware And Installation Manual page 247

Example of Cabinet Installation for EMC
Figure A-2 shows a cabinet installation in which the measures described above
(grounding of inactive metal parts and connection of cable shields) have been
applied. However, this example only applies to grounded operation. Observe the
points marked in the figure when installing your system.
Figure A-2
The numbers in the following list relate to the numbers in Figure A-2.
1. Grounding Strips
If there are no large-area metal-to-metal connections, you must interconnect
inactive metal parts such as cabinet doors or support plates via grounding strips
or to ground. Use short grounding strips with a large surface.
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
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1
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Example of Cabinet Installation for EMC
Assembling and Installing Systems
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A-7