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Cable shielding is a layer of conductive material (often aluminum or copper) that surrounds the inner conductors to block electromagnetic interference (EMI). It is necessary in environments with high levels of electrical noise or in applications where signal integrity is critical, such as in instrumentation or data transfer cables.

The voltage rating indicates the maximum voltage the cable can safely carry without risk of insulation breakdown. For control cables, voltage ratings are typically lower than for power cables, often ranging between 300V and 600V, but this can vary based on the type of cable.