In Australia, we use the metric system for cross-sectional area (mm²). A common mistake is thinking "thicker wire is always better." While thicker wire reduces resistance, it is more expensive and harder to terminate.

In the automotive world, the naming conventions can be tricky. Unlike household wiring, "Auto Cable" is often named by the external diameter of the insulation, not the actual copper inside. Auto Trade Size Approx. Cross Section (mm²) Common Amp Rating Example Use Case 10 - 15 Amps LED lights, stereos, UHF radios 4mm 1.84 - 2.0 mm² 15 - 20 Amps Small fridges, driving light switches 6mm Solar panels, Anderson plugs for caravans 3. B&S and AWG (Thick Cables)