The characteristics of medium and low voltage power cables

Medium and low voltage power cables refer to cable products used for transmitting and distributing medium and low voltage electrical energy (typically with voltage levels ranging from 1kV to 35kV).

Oct 16,2025

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The characteristics of medium and low voltage power cables

Medium and low voltage power cables refer to cable products used for transmitting and distributing medium and low voltage electrical energy (typically with voltage levels ranging from 1kV to 35kV). This type of cable is an indispensable infrastructure in the power system, widely used in urban power grids, industrial parks, building distribution, rail transit, and new energy power generation, etc. It undertakes the important task of safely and efficiently transmitting electrical energy from the power generation end or substation to the user end.

Technical characteristics and classification
The core structure of medium and low voltage power cables includes conductors, insulation layers, and sheath layers. Some products also incorporate shielding layers or armor layers to enhance performance. According to the material of the conductor, cables can be classified into copper core cables and aluminum core cables. The former has better electrical conductivity but is more expensive, while the latter is more economical. Classified by insulating materials, there are mainly cross-linked polyethylene (XLPE) insulated cables, polyvinyl chloride (PVC) insulated cables, etc. Among them, XLPE cables have become the mainstream choice due to their high-temperature resistance and aging resistance. The sheath materials are mostly made of PVC or low smoke zero halogen (LSZH) materials. The former has a low cost and strong protective performance, while the latter releases less smoke and toxic gases when burning, making it more suitable for crowded places.

Application scenarios and advantages
urban power grid ‌ : Medium and low voltage cables are the main components of urban underground pipe networks. They achieve concealed transmission of electrical energy through direct burial or pipeline laying, reducing the impact on the urban landscape.
In the ‌ industrial field ‌ : In factories, mines and other scenarios, cables need to withstand complex environments such as mechanical stress and chemical corrosion. Armored or corrosion-resistant cables can effectively extend their service life.
building power distribution ‌ : It is used for vertical or horizontal wiring inside buildings, and the cables are required to have flame retardancy, low smoke and other properties to ensure fire safety.
new energy access ‌ : With the development of distributed energy sources such as photovoltaic and wind power, medium and low voltage cables have become a key link connecting power generation units to the power grid and need to adapt to harsh outdoor weather conditions.
Industry standards and key points for selection
Internationally, medium and low voltage cables follow the IEC 60502 standard, while domestically, the GB/T 12706 series specifications are adopted. When selecting the model, the following parameters should be given special attention:

Voltage level ‌ : It needs to match the nominal voltage of the system and leave a certain margin.
current-carrying capacity ‌ : Select the cross-sectional area of the conductor based on the load current to avoid overheating;
Environmental adaptability ‌ : Consider factors such as temperature, humidity, and chemical corrosion, and select cables of the corresponding protection grade;
Installation method ‌ : Direct burial, pipe threading or cable tray laying have different requirements for the mechanical strength and sheath performance of the cable.
Development trend
With the advancement of smart grids and energy transitions, medium and low voltage cables are evolving towards high performance and environmental friendliness. For instance, the use of ultra-clean insulating materials can reduce dielectric loss and enhance transmission efficiency. Use degradable materials to reduce the environmental burden; Integrated sensors are used to achieve status monitoring and provide early warnings of faults. In addition, modular design facilitates quick installation and maintenance and is also an important direction for future innovation.

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