What are the differences between the bending radius requirements for photovoltaic cables and those for ordinary cables?
Release Time : 2026-04-15
The difference in bending radius requirements between photovoltaic cables and ordinary cables stems from fundamentally different material properties, application scenarios, and performance requirements. Photovoltaic cables, as special cables designed specifically for solar photovoltaic systems, must be exposed to outdoor environments for extended periods, enduring direct sunlight, high temperatures, low temperatures, humidity, and sandstorms, while simultaneously meeting the requirements for efficient and safe DC power transmission. Ordinary cables, on the other hand, are mostly used indoors or in relatively stable environments, such as household electricity, lighting, and small appliances. Their design focuses on meeting basic electrical safety and cost-effectiveness, rather than adaptability to extreme environments. This difference directly leads to a significant difference in their bending radius requirements.
The bending radius requirements for photovoltaic cables are generally more stringent, which is closely related to their material properties. The insulation and sheath of photovoltaic cables often use radiation-crosslinked polyolefin materials. After treatment with an accelerator, the molecular structure changes, giving them excellent high-temperature resistance, cold resistance, UV aging resistance, chemical corrosion resistance, and flame-retardant and environmentally friendly properties. While this material significantly improves the cable's durability, it also places higher demands on bending performance. If the bending radius is too small, the insulation or sheath may crack or deform due to excessive stretching, even damaging the internal conductors and affecting power transmission efficiency and safety. Therefore, the bending radius of a photovoltaic cable needs to be determined comprehensively based on material properties, cable structure, and installation scenario, and is generally required to be no less than a specific multiple of the cable's outer diameter to ensure long-term reliability.
The bending radius requirements for ordinary cables are relatively more lenient, which is related to their application scenario and material properties. Ordinary cables mostly use polyvinyl chloride (PVC) or ordinary cross-linked polyethylene (XLPE) as insulation and sheath materials, and their temperature resistance, weather resistance, and UV resistance are lower than those of photovoltaic cables, making them difficult to withstand harsh outdoor environments for extended periods. However, in indoor or stable environments, the bending radius requirements for ordinary cables can be appropriately reduced to meet installation convenience and cost-effectiveness. For example, the bending radius of multi-core ordinary power cables is usually required to be no less than fifteen times the cable's outer diameter, while single-core cables, due to their susceptibility to mechanical stress, may have even stricter requirements, but overall, they are still lower than the standards for photovoltaic cables. The bending radius requirement for photovoltaic cables is closely related to the specific application scenarios. In solar photovoltaic systems, cables need to connect solar panels, combiner boxes, inverters, and other equipment to transmit DC power. During this process, the cable may need frequent angle or path adjustments to adapt to the adjustability of the photovoltaic support system or the needs of regular maintenance. If the bending radius is insufficient, the cable structure may be damaged during repeated bending, leading to problems such as poor contact, increased resistance, or short circuits, affecting the overall system performance. Therefore, the bending radius requirement for photovoltaic cables must consider both fixed and mobile installation scenarios to ensure structural integrity and stable electrical performance under various operating conditions.
The bending radius requirement for ordinary cables focuses more on installation convenience and space utilization. In indoor or stable environments, the bending radius of cables usually does not need to consider extreme environmental factors, but rather focuses on meeting wiring specifications and equipment connection requirements. For example, in building electrical wiring, the bending radius of cables must ensure that there is no excessive stretching or compression at the bends to avoid damage to the insulation or conductor. However, the overall requirements are relatively flexible and can be adjusted appropriately according to the actual space and installation conditions.
The difference in bending radius requirements between photovoltaic cables and ordinary cables is also reflected in the consideration of sheath thickness. The sheath thickness of photovoltaic cables is usually designed according to their environmental stress resistance requirements. While a thicker sheath can improve weather resistance and mechanical strength, it also places higher demands on the bending radius. If the sheath thickness exceeds a certain standard, the bending radius needs to be increased accordingly to prevent the sheath from cracking or deforming due to excessive bending. Ordinary cables, on the other hand, focus more on cost and basic protection requirements in their sheath thickness design, and their impact on the bending radius is relatively smaller.