Basic Structure of 1.5 mm² Copper Wire
1.5 mm² copper wire can be either single-core or multi-core, depending on its intended application. Single-core wire consists of a single solid copper conductor and possesses greater rigidity; multi-core wire, conversely, is composed of multiple fine copper strands twisted together, offering superior flexibility. In typical residential wiring installations, wires with a 1.5 mm² cross-section are predominantly single-core rigid wires, whereas connecting cables for electrical appliances commonly utilize multi-core flexible wires.
Performance Comparison: Single-Core vs. Multi-Core Wires
Conductivity: Given the same cross-sectional area, the electrical conductivity of single-core and multi-core wires is comparable.
Flexibility/Bend Resistance: Multi-core wires can be bent repeatedly without easily breaking, whereas single-core wires are prone to deformation after bending.
Ease of Installation: Multi-core wires are better suited for complex wiring routes, while single-core wires require a larger bending radius.
Oxidation Resistance: Due to their smaller surface area, single-core wires exhibit greater resistance to oxidation; multi-core wires, however, require particular attention regarding insulation protection.
Purchasing Recommendations and Application Scenarios
Selection Based on Operating Environment:
Fixed Installations (e.g., concealed in-wall wiring): Prioritize single-core wires for their superior stability.
Mobile Devices (e.g., power tools): Multi-core wires are mandatory to prevent conductor breakage caused by movement.
Humid Environments: It is advisable to select multi-core wires featuring a waterproof sheath; pay close attention to verifying the thickness of the insulation layer.
High-Frequency Vibration Environments: Employ specialized fatigue-resistant multi-core wires to prevent metal fatigue.