Shielded wire Shielded wire is widely used in signal transmission. It can not only reduce the influence of external electromagnetic fields on power supply or communication lines, but also prevent the line from radiating electromagnetic energy.

So what should you pay attention to when using shielded cables?
1. The ground wire of the shielded wire cannot be broken, and must be twisted into a strand;
2. The braided ground wire of the shielded wire should be as short as possible;
3. The ground wire of the shielded wire must be grounded firmly, and the grounding resistance should be small;
4. The shielding layer of the shielded wire should not be stripped too long, resulting in too much exposure of the signal wire;
5. The shielded wire cannot be grounded at multiple points, because different grounding points are always different, and there is a potential difference at each point. The formation of current in the shielding layer not only fails to shield, but also introduces interference. Especially in the occasions where the frequency converter is used a lot, the interference contains various high-order harmonic components, which has a greater impact and should be paid special attention.