Solid-core wire possesses a distinct advantage in tensile strength; its single-strand copper structure resists deformation during conduit installation, making it particularly well-suited for scenarios requiring long-distance wire pulling. In contrast, flexible wire-due to its multi-strand copper structure-is prone to localized strand breakage when subjected to repeated bending, which can lead to increased electrical resistance and even overheating. Accelerated aging tests conducted by a power engineering laboratory demonstrated that, following bending tests simulating ten years of service, the decline in conductivity observed in solid-core wire was 40% lower than that of flexible wire.
Nevertheless, the inherent flexibility of flexible wire allows it to perform more effectively in environments subject to vibration. For instance, the connection cables for appliances such as refrigerators and air conditioners typically utilize flexible wire, as it effectively dampens the mechanical vibrations generated during equipment operation. It is worth noting that high-quality flexible wires often incorporate tinned copper strands or feature an added nylon sheath to enhance fatigue resistance; for example, wires from German manufacturers typically boast a service life that exceeds that of standard products by more than 30%.