Metal shielding is an important measure for reducing and preventing electrical interference. This includes overall shielding, sub-shielding, and double-layer overall shielding. The type of metal shielding for control cables should be selected based on the potential impact of electrical interference, taking into account comprehensive interference suppression measures to meet interference and overvoltage reduction requirements. The higher the interference prevention requirements, the greater the corresponding investment. When using steel tape armor or braided steel wire overall shielding, the cable price increases by approximately 10% to 20%.
The following describes two shielding methods for control cables:
1. Winding is inferior to braiding in terms of shielding effectiveness.
2. Its shielding effect is directional.
3. Its shielding properties change when bent.
4. However, it offers advantages such as a small finished outer diameter, flexible wire material, and a relatively low price.
5. It is suitable for low-frequency shielding.
2. Braided Shielding
Similar to diagonal wrapping, braiding primarily shields the cable, protecting it from external electric and magnetic fields.
It improves the cable's interference resistance and offers the following advantages over diagonal wrapping and aluminum foil:
1. The shielding is non-directional.
2. It has excellent high-frequency shielding properties and is suitable for high-frequency shielding.
3. Through multiple layers of shielding, the shielding effectiveness can reach 100%.
4. The shielding properties remain unchanged when bent.
