Voltage drop & wire section
Current + length + voltage → minimum wire section meeting the allowed voltage drop (DC/1φ/3φ).
How to use
- Enter the calculation conditions
Enter the dimensions, loads, speeds or operating conditions requested by the form.
- Run the calculation
The tool applies the formulas shown on this page to the entered values.
- Review the result
Review the resulting specification and checks, then verify them against the cited source, current standard and real operating conditions before use.
Core formula
A_min = k · ρ · L · I / (U · %limit/100)
Example using default values
A_min = 2 · 0.0225 · 40 · 16 / (220 · 5/100) = 2.62 mm² → choose 4 mm²
Source: Ohm's law; IEC 60364-5-52 / TCVN voltage-drop guidance.
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