Are you designing a low-voltage installation and want to quickly verify whether you’ve used a cable with the correct cross-section? You’re in the right place! The new tool allows you to calculate the voltage drop depending on:

  • the cable material (copper/aluminum),
  • the cable length,
  • the cable cross-section,
  • the current drawn by the loads,
  • the supply voltage of the circuit.

Sounds familiar? Not quite. We have something for you SOMETHING NEW. Our tool is divided into two sections:

  1. Room conditions (for temperature 20ºC)
  2. FIRE CONDITIONS (temperature rise over time – taking into account the conductor resistance correction factor in accordance with SITP WP-02:2021 guidelines)

Try out the new tool and check whether the circuit you’re designing will perform correctly when exposed to high temperatures (such as during a fire).

It should be noted that circuits powering fire protection devices are, by design, required to operate reliably after a fire hazard occurs (exposure to extreme temperatures exceeding even 1000ºC).

The tool is completely free. You can find it here: https://w2.com.pl/en/new-tool-voltage-drop-calculator-for-direct-current-circuits/

We hope that access to the Calculator will make it easier to verify the basic parameters of a circuit, as well as draw your attention to the challenging issue of conductor resistance increasing with temperature.

Best regards,
W2 Team