Key Conclusion: For home wiring, prioritize single-core (solid) wires for main circuits, while multi-core (stranded) wires are best suited for localized flexible applications or device connections.
Comparison of Basic Characteristics
Single-core Wire (BV): Features a single solid copper core; it is rigid, highly resistant to deformation, and ideal for installation within conduits or embedded in walls.
Multi-core Wire (BVR): Composed of multiple fine copper strands twisted together; it is flexible and easy to bend, making it suitable for wiring sockets or connecting to movable devices.
Analysis of Key Dimensions
Conductivity: Given the same cross-sectional area, single-core wires offer slightly superior current-carrying efficiency compared to multi-core wires (due to a lesser impact from the "skin effect").
Fatigue Resistance: Multi-core wires are more durable under frequent bending; single-core wires are prone to breakage if bent repeatedly.
Cost: Single-core wires involve a simpler manufacturing process and are typically 10% to 20% less expensive than multi-core wires.
Installation Difficulty: Single-core wires are rigid and often require tools to pull through conduits; multi-core wires allow for easier and more convenient manual routing.
Recommendations for Home Wiring Applications
Primary Use (Single-core): Fixed circuits such as lighting loops, dedicated air conditioning lines, etc. (typically in 2.5mm² or 4mm² specifications).
Auxiliary Use (Multi-core): Applications requiring localized flexibility, such as internal wiring within electrical sockets or connection cables for pendant lights.
Safety Risk Alerts
Oxidation Risk: Due to their larger surface area, multi-core wires are more susceptible to oxidation; they should be used in conjunction with tin-plating processes or terminal connectors.
Connection Requirements: Multi-core wire joints must be tinned (soldered) or fitted with crimp terminals to prevent loose connections and the risk of arcing/sparking.