
User Manual
Section 7
GFK-2958L
May 2021
Earthing and shielding
418
•
Radio interference
•
ESD (electrostatic discharge)
•
Burst
•
Mains feedback
Note
:
Another area of concern as regards shield contact is the flow within the conductor. Temperature
changes caused by the current lead to changes in the conductor cross-section. A rigid contact can
therefore only be partially effective. A self-adjusting contact is what is really required.
Figure 249: Use of a Clamping Bracket
7.1.3
Effective Shielding
It is important that the shielding is not positioned on the earth of the connected
component, but on the protective earth. In the case of components that are installed in a
metal housing, the shielding must be positioned to this housing. If no earthed housing is
available, the shielding is positioned on a separate earth.
When installing ground connections on shielding, it is generally also important that no earth
loops are created. The smaller the earth loop, the less the danger of the induction of
interference voltages. It is therefore most suitable to have a purely neutral-point
installation.
The following sketches show the possible shielding connections to protective earth.
A one-sided connection of the shielding protects against capacitive coupling of interference
voltages.