There are three important principles to be especially considered:
– Keep all connections as short as possible (in particular the grounding con-
ductors)
– Use large conductor cross sections (in particular for the grounding conduc-
tors)
– Create low-impedance, i.e. good and large-sized contacts (in particular for
the grounding conductors)
Pay attention to the following:
– Use vibration-resistant connections
– Clean metallic contact areas
– Use solid plug and screw-type connections
– Use earth cable shields with clips on a well-grounded metallic surface
– Do not use aluminium parts
– Do not use sheath wires
– Do not use toothed lock washers under screw connections
Fig. 10: Assembly: wrong
Fig. 11: Assembly: correct
Make a connection between the DIN rails and PE (Protective Earth). For this, use an grounding
wire with a minimum conductor cross section of 10 mm².
The wire is connected to the DIN rail with an M6 screw.
A large-area contact of the DIN rail with the metallic mounting plate improves the EMC behavior
significantly, as the disturbances can be discharged more effective.
6.2.2 Cable routing
● Route cables meeting the standards.
● Sort the cables into cable groups:
– Power current cables
– Power supply cables
– Signal cables
– Data cables
EMC-conforming assembly and construction > Cable routing
2023/03/033ADR011074, 1, en_US60
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