Calculation of the conductor cross-section - direct current DC, 12V

Hello users,

I need to calculate the cross section of the DC conductors for 2 devices.
Voltage 11-12.5V, DC
The value of the current, if it ever flows like this - 30A. Nominal value 10-25A.

Cable length in 1 device: 0.8m.
Cable length in device 2: 0.5m.

At the moment I have a 2.5mm ^ 2 cable, which I would like to use due to the small distance between the source and the receiver.

While searching the forum, I found an online calculator available at:
https://enterius.eu/wsparcie/kalkulator-przekrój-pirectow-led/
In the link to the calculator available above, the 2.5mm ^ 2 cable fits, but nevertheless I would like to consult the forum.

The 2.5 cable is perfectly suited to your application.

daro31ie wrote:

The 2.5 cable is perfectly suited to your application.

For both devices?
Cable length in the device 1: 0.8 m.
Cable length in device 2: 0.5m.

greetings

For a current of 30A, the cable cross-section should be 4mm2. You can load a 2.5mm2 cable with a current of up to 20A

There is no clear answer to the question, because we do not know what the acceptable voltage drops may be and how the cable is arranged and thus cooled. For copper, the resistance is 18m?xm / mm? and this formula should be used in such calculations.

Hello!
If I need to give a cable, e.g. 10mm², can I give e.g. 3x5mm² instead?

You can give 2x5mm2. 3x5mm2 even more.