Shielding of cables

In principle, any electrical cable can cause or suffer electronic magnetic interference due to the coupling effect. To ensure its electromagnetic compatibility, a cable must be electrically shielded. This protective effect is primarily expressed by the so-called optical coverage of the shield. This refers to the area that is optically covered by the shield. For example, if the cable has a copper foil as a screen, it can be said to have 100% coverage because it acts like a tube. If the screen is braided or wrapped with wires, this has the advantage that the screen is not affected by movement, unlike the foil. However, the disadvantage is that the coverage area decreases because there is a small gap between each screen wire.

For cables in linear motion, it has been proven that a braided screen with high coverage and optimum braid angle is the best solution. If, on the other hand, a torsion cable  is involved, the optimum solution is a folded shield that is bedded on a gliding material. The best shielding result is achieved with an optical coverage of 90%.