Here you have the possibility to calculate the required cross-section of copper connection
cables in the DC network. Normal DC loads such as DC motors are connected here. 

The cable calculator offered here only provides a rough estimate of the cross-section! 

A = (2 x I x L) / (K x Δu x U)
Cable cross section: A
Current: I
Cable length: L
Voltage Drop: Δu
Voltage: V
Please fill all mandatory inputs.

For Example:

A 24 volt DC motor has a rated current of 2.47 amps, a cable length of 28 m,
and the voltage drop of the cable is 2%.
Which cable cross-section results from these specifications?

A = (2 x I x L) / (K x Δv x V)
A = (2 x 2.47 A x 28 m) / (56 x 0.02 x 24 V)
A = (138.32) / (26.88)
A = 5.15mm²

The next larger suitable cross-section is 6 mm²!


Measuring Units:

Cross section      A = mm²
Voltage                V = Volt [V]
Current                I = Ampere [A]
Kappa copper     K = 56 [m / Ω ​​x mm²]
Delta V                Δv = %



Kabelquerschnitt berechnen Gleichstrommotor
To the product page "DC motors"