17/07/2026
Difference Between 1.0 mm² and 1.5 mm² Single-Core Copper Wires
Feature 1.0 mm² Wire 1.5 mm² Wire
Conductor thickness Thinner Thicker
Current-carrying capacity Lower Higher
Strength More flexible but less robust Stronger and more durable
Common uses Light points, switch wiring, control circuits Lighting circuits, higher-load lighting, and some socket circuits (depending on local wiring regulations)
Voltage drop Higher over long distances Lower over the same distance
Cost Cheaper Slightly more expensive
How to Identify Them
1.0 mm² has a smaller copper conductor inside the insulation.
1.5 mm² has a noticeably thicker copper conductor and usually feels slightly heavier.
The easiest and most reliable way is to read the size printed on the insulation, such as "1.0 mm²" or "1.5 mm²".
For safety, always use the wire size recommended for the intended electrical load and follow your local electrical code.
