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Cable section calculator

Home Electric cable section calculator

Advanced tool for calculating the optimal
section of electrical cables.

Simplify the process of selecting the optimal cable section with this easy-to-use tool.
Whether you're working on single-phase or three-phase circuits, this calculator helps you determine the required conductor section based on power, voltage drop, type of laying, material, and other factors. Ideal for electricians, engineers, or DIY enthusiasts seeking precision and efficiency. Make informed decisions to ensure safety, efficiency, and compliance with industry standards.

Electric conductor section calculator


How does this calculator work?

The cable section calculator is an intuitive tool designed to help you select the right conductor for your electrical projects. Simply input specific data such as power, current type, cable length, material, and voltage drop, and the calculator will provide the optimal minimum size to ensure safety and efficiency for your installation.


Conductor Section Calculator 230-400V – This tool is exclusively designed for electrical networks used in Europe, where standard voltages are 230V for single-phase current and 400V for three-phase current. Attention: The calculated values are not applicable to systems in other regions, such as North America, where standard voltages differ (e.g., 120V). Please verify local specifications before use.

User Responsibility

The results provided by this calculator are indicative and based on the data entered. It is the user's responsibility to verify and ensure that the obtained values comply with project norms and requirements. For final validation, consulting a certified specialist is strongly recommended.


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Formulas used in the cable section calculator

Calculation of electrical power in single-phase systems

\[ P = U \cdot I \cdot \cos\phi \]

Calculation of electrical power in three-phase systems

\[ P = \sqrt{3} \cdot U \cdot I \cdot \cos\phi \]

Calculation of current intensity in single-phase systems

\[ I = \frac{P}{U \cdot \cos\phi} \]

Calculation of current intensity in three-phase systems

\[ I = \frac{P}{\sqrt{3} \cdot U \cdot \cos\phi} \]

Calculation of voltage in single-phase systems

\[ U = \frac{P}{I \cdot \cos\phi} \]

Calculation of voltage in three-phase systems

\[ U = \frac{P}{\sqrt{3} \cdot I \cdot \cos\phi} \]

Calculation of conductor section (without insulation) in single-phase systems

\[ S = \frac{2 \cdot \rho \cdot L \cdot I}{\Delta U} \]

Calculation of conductor section (without insulation) in three-phase systems

\[ S = \frac{\sqrt{3} \cdot \rho \cdot L \cdot I}{\Delta U} \]

Calculation of conductor section (with insulation)

\[ D_{\text{total}} = D + 2 \cdot t \]

Calculation of conductor diameter from section

\[ D = \sqrt{\frac{4 \cdot S}{\pi}} \]

Where
  • \( P \) = Electrical power (in \( W \) or \( kW \))
  • \( U \) = Supply voltage (in \( V \))
  • \( I \) = Current intensity (in \( A \))
  • \( \cos\phi \) = Power factor
  • \( S \) = Conductor cross-sectional area (in \( mm^2 \))
  • \( \rho \) = Resistivity of the material:
    • Copper: \( 1.7 \times 10^{-8} \, \Omega \cdot m \)
    • Aluminum: \( 2.6 \times 10^{-8} \, \Omega \cdot m \)
  • \( L \) = Length of the conductor route (in \( m \))
  • \( \Delta U \) = Permissible voltage drop (in \( V \))
  • \( D_{\text{total}} \) = Total diameter of the conductor (including insulation, in \( mm \))
  • \( D \) = Diameter of the conductor without insulation (in \( mm \), calculated from \( S \))
  • \( t \) = Insulation thickness (in \( mm \))

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