Cable Core Size Calculator

Formula

The formula to calculate cable core size is:

\[ A = \frac{V}{\rho \cdot I} \]

Where:

\(A\) is the cable core size (mm²)
\(V\) is the voltage drop (V)
\(\rho\) is the resistivity of the material (Ohm mm²/m)
\(I\) is the current (A)

What is Cable Core Size?

Cable core size refers to the cross-sectional area of the conductive part of a cable, typically measured in square millimeters (mm²). The core size determines the amount of current the cable can safely carry and the voltage drop over a given length. Larger core sizes can carry more current with less voltage drop, making them suitable for higher power applications. The choice of cable core size is crucial for ensuring electrical safety, efficiency, and performance in various applications, from household wiring to industrial power distribution.

Example Calculation 1

Let's assume the following values:

Voltage Drop (V) = 10 V
Current (I) = 20 A
Resistivity (ρ) = 0.017 Ohm mm²/m

Using the formula:

\[ A = \frac{10}{0.017 \times 20} = 29.41 \text{ mm²} \]

The Cable Core Size is 29.41 mm².

Example Calculation 2

Let's assume the following values:

Voltage Drop (V) = 5 V
Current (I) = 15 A
Resistivity (ρ) = 0.017 Ohm mm²/m

Using the formula:

\[ A = \frac{5}{0.017 \times 15} = 19.61 \text{ mm²} \]

The Cable Core Size is 19.61 mm².