High-flexibility control cables typically consist of a conductor, insulation layer, outer wrapping, and outer sheath. The insulation layer prevents electrical leakage, ensuring safety; the outer sheath reduces damage and corrosion from the external environment; and the inner wrapping primarily protects the conductor.
However, there is also a special protective layer inside the control cable known as the shielding layer. The main reasons for the existence of the shielding layer are:
The shielding layer helps terminate the electrons in the electric field at the surface of the shield and directs them to the ground. This separation of the electric field protects the cable core inside from external strong electric field interference, which is crucial for control cables, communication cables, computer cables, and instrumentation cables.
When current flows, it generates a magnetic field—the larger the current, the stronger the magnetic field. The shielding layer prevents this magnetic field from affecting nearby equipment or devices, ensuring smooth operation and reducing potential issues.
The shielding layer also provides some protection against electrical leakage. If the cable gets damaged and leaks, the grounding shield directs the current to the ground, offering a level of safety. Additionally, it protects the cable conductor itself.
In control cables, the current flow is usually not very high, but the shielding layer plays a vital role in reducing external signal interference. Since control cables transmit signals, they are prone to external influences and fluctuations. The shielding layer helps mitigate these effects, ensuring stable signal transmission.
This is the primary function of the shielding layer in control cables—protecting the internal components from external interference.
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