TCI KRF User Manual
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For operating currents greater than 250 A, we recommend the PE connection to be set up
between the feed (filter: line) and output (filter: load) not via the PE terminal bolt in the filter
housing. This is because of the restricted area of the cable lug of the PE connection to the filter
housing. Ideally, the PE feed line should be connected with the PE output line to a PE busbar
which also carries the PE terminal(s) of the EMC filter. The number of necessary PE
connections to the filter depends on the cross-section and the required KU factor as a function
of the magnitude of the leakage current. The PE conductor connections must satisfy the
requirements defined in IEC 60364-5-54 (DIN VDE 0100 T540). For currents >1000 A and/or
short-circuit currents >25 kA, it is not permissible to loop the PE conductor through the filter
housing.
3. In your system, set up connections at the same reference potential in order to reduce
galvanically coupled interferences. All metallic reference potentials of housings,
machines and installations should be linked via a low-impedance connection suited for
RF and intermeshed as far as possible.
Set up large-area metallic connections, use equipotential busbars and set up short
connections to ground via flat ribbon cables.
The following conditions apply:
• Large-area ground connection,
• Low-inductance connection (preferably a copper ribbon and not circular conductors),
• Short connections (rule of thumb: length divided by width < 3).