IS580 User Manual Chapter 8 EMC
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8.4 Shielded Cable
8.4.1 Requirements for Shielded Cable
The shielded cable must be used to satisfy the EMC requirements of CE marking. Shielded cables are
classified into three-conductor cable and four-conductor cable. If conductivity of the cable shield is not
sufficient, add an independent PE cable, or use a four-conductor cable, of which one phase conductor is
PE cable.
The three-conductor cable and four-conductor cable are shown in the following gure.
PE
Shield
PE conductor
and shield
PE
Shield
To suppress emission and conduction of the radio frequency interference effectively, the shield of the
shielded cable is cooper braid. The braided density of the cooper braid should be greater than 90% to
enhance the shielding efciency and conductivity, as shown in the following gure.
Cable core
Internal insulator
Copper braid
Copper shield
Insulation jacket
The following gure shows the grounding method of the shielded cable.
Figure 8-3 Grounding of the shielded cable
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