Beijer Electronics BoX2 extreme Installation Manual page 24

Additional Installation Tips
Place the 24 V DC and communications cabling in one cable trunk/cable duct
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and 230/380 V AC in another. If the cables need to be crossed, cross them at
90° only. Avoid combining the cabling for stronger 24 V DC outputs with
the communication cabling.
Ferrite cores that are snapped onto the shielded cabling may remove minor
disturbances. Large ferrite pieces that are snapped onto unshielded cabling and
where the wires go 2-4 times around the cores are approximately 5-25 times more
efficient.
24 Beijer Electronics, MAEN276