Cable Size Calculator Australia Updated 〈Android EXTENDED〉

Even if a cable can handle the heat, it might be too small to prevent voltage drop over a long distance. This is the most common reason you have to upsize a cable.

| Parameter | Typical Values / Notes | |-----------|------------------------| | | Steady-state current (A), not just breaker rating | | Supply voltage | 230V (single-phase) or 400V (three-phase) | | Cable length | One-way distance (m) | | Installation method | Enclosed in conduit, clipped direct, underground, in air, etc. | | Ambient temperature | Default 30 °C for air, 25 °C for ground. Derate if hotter (e.g., 40 °C roof space) | | Insulation type | V90, V75, XLPE, PVC, etc. | | Conductor material | Copper (preferred) or Aluminium | | Voltage drop limit | 5% for lighting/power (max 11.5 V drop on 230 V) | | Protection device | MCB (B/C/D curve), RCD, fuse type | | Grouping factor | Multiple cables bunched together → derating | | Soil thermal resistivity | For underground cables (typical RHO = 1.2 °C·m/W) | cable size calculator australia

In Australia, cable sizing follows (Copper & Aluminium cables – Selection & installation). Even if a cable can handle the heat,