29
CD1-k – Installation Guide
Chapter 4 - Connections
2 - WIRING RECOMMENDATIONS
(according to EN61000.4-2-3-4-5 and EN55011 standards - see diagram "Shield connection on the connectors " –
2.1 - GROUND CONNECTIONS AND GROUNDING
A shield has no effect if it is not connected:
- to a reference potential,
- by a connection as short as possible (a few centimeters; 10 centimeters is prohibited),
- by a "360°" shield connection. This means that the whole circumference of the shield sleeve must be
connected to the reference conduction via a metal collar.
The connectors used for the compliance with the EN61000.4 standard must be made of metal or metallized and
must allow the 360° shield connections.
Reference potential loops (especially with the ground) are recommended
only
if these connections have a very
low impedance (< 0,1
Ω
). Any shield that is used as a conductor can be connected at both ends with the condition
to be connected over 360° at both ends by means of metal links in order to ensure the shield continuity.
The reference potential must be the ground.
Cables with low potential should
never
run in the proximity of power lines.
If there is a potential reference, i.e. a main chassis or cabinet with a low impedance between its different
elements, it should be used to connect ALL references to it and also being grounded itself.
CAUTION !
Each potential conducting element
must be
shielded
. Several potential conductors
in the same sleeve
must be
twisted and shielded
.
