Recommended size
4 mm^2
This is the first standard conductor size that satisfies both the ampacity check and the voltage-drop target.
Calculator preliminar
Cable sizing calculator
Preliminary conductor sizing using deterministic logic: a simplified ampacity table combined with a resistive voltage-drop estimate.
Assumptions used by this calculator
- Preliminary sizing only, based on ampacity lookup and resistive voltage-drop estimate.
- Length is one-way route length. Single-phase and DC use the round-trip factor automatically.
- Final design still needs checks for installation method, ambient temperature, grouping, insulation, short circuit, and applicable code.
Governing constraint
Voltage drop
The voltage-drop requirement drives the final cable size.
Voltage drop
2.73%
10.91 V estimated drop at the recommended size.
Ampacity check
32 A
Estimated current capacity of the recommended cable size under the baseline table assumptions.
Size by ampacity
4 mm^2
Minimum standard size needed to pass the simplified current-carrying check.
Size by voltage drop
3.64 mm^2
Calculated minimum cross-sectional area before rounding up to the nearest standard size.