How to Distinguish High-Voltage Cables from Low-Voltage Cables
Cables are widely used in daily work and life, and they can be roughly categorized into low-voltage cables and high-voltage cables. Here are two straightforward and practical ways to tell them apart:
1. Judging by Appearance: Thickness of the Insulation Layer
The most intuitive difference lies in the thickness of the outer insulation layer.
High-voltage cables require a thick insulation layer to withstand high voltage and prevent electric leakage. Generally, the thickness of their insulation layer is around 1 centimeter, presenting a sturdy and bulky overall appearance.
Low-voltage cables have a much thinner insulation layer. Their thickness is similar to that of the data cables we use daily, or only slightly thicker, making them relatively lightweight and flexible.
2. Identifying by Cross-Section: Presence of a Shielding Layer
This is a more essential and accurate distinguishing feature, which requires observing the internal structure of the cable cross-section.
High-voltage cables are equipped with a special shielding layer—a structural component that low-voltage cables usually do not have. Since high-voltage cables carry large currents, they will generate strong electric fields during operation. The shielding layer plays a critical role in blocking the external interference of these electric fields and ensuring the stable and safe operation of the cable.
Low-voltage cables only have basic structures such as conductors and insulation layers, without an additional shielding layer, because their operating voltage and current are low, and the generated electric field will not cause significant interference.

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