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The shield has two functions:
1. To shield the electrical wire and cable.
(1) Electric currents increase as power flows through the power cable and generate an electrical
field. Such interference can be suppressed inside the cable by shielding the power cables or
the electrical wires.
(2) To form a protective earthing. When the cable core is damaged, the leakage current will flow
via the shield to ground
2. To protect the cable. A power cable used for the computer control purpose generates only
relatively low amount of current inside the cable. Such power cable will not become the source of
interferences but has great possibility to be interfered by the surrounding electrical devices.
Metal lic shield
Plastic jacket
Dielectric insulator
Centre core
Figure A-18
Appendix A. EMC Standard Installation GuideEB3000
Figure A-19
A-17
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