Shanghai STEP Electric Corporation
Appendix A EMC Installation Guide
A2.2 Requirements on Cable Size
Greater cable size causes greater ground capacitance and greater ground leakage current.
Therefore, motor cable with excessive cross-sectional area shall be used by derating so as to
reduce output current (each increment of cross sectional area makes current decreasing by 5%).
A2.3 Requirements on Shielded Cable
High frequency low-impedance shielded and armored (such as weaved copper wire mesh or,
aluminum wire mesh) cable shall be used.
A2.4 Requirements on Installation of shielded cable
Control cables are mostly shielded cables which shielding-purpose metal wire mesh must be
connected to metal casing by 360° girth jointing method with cable clip at both ends, as shown by
figure A2.2. In addition, the figure A2.3 shows an incorrect shield grounding method.
Figure A2.2 Correct Shield Grounding Method
Fig A2.3 Incorrect Shield Grounding Method
A3 Grounding Requirements
A3.1 Grounding Method
See figure A3.1 for grounding method of Ground pole
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