25
CD1-a
Chapter 4 - Connections
2 - WIRING
(according to EN61000.4-2-3-4-5 and EN55011 standards - see diagram "Shield connection on the connectors " –
chapter 4, section 2.2).
2.1 - EARTH WIRING AND EARTHING
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 conductor 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 loops have a very low
impedance (< 0,1 Ω). Any shield that is used as a conductor can be connected at both ends under the condition
to be connected over 360° at both ends by means of metal links in order to ensure the shield continuity.
The preferred reference potiential must be the earth.
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 with 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.
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