Cable Voltage Drop Calculator in Excel for Multiple Circuits

After choosing a cable you must confirm the voltage drop stays within the allowed limit, especially on long runs. This sheet checks several circuits together and tells you right away whether each result is acceptable.

What is inside the sheet?

• Check up to 10 circuits on one page
• Voltage drop in volts from current, length and mV/A/m
• Automatic comparison with an editable allowed limit
• "OK" or "Too high" status for each circuit

How to use it

1. Enter the nominal voltage and the maximum allowed drop
2. Enter each circuit name, current and length
3. Take mV/A/m from the cable manufacturer table and enter it
4. Read the status next to each circuit and increase the cable size if needed

Tips for best results

• Use the value that matches the cable type and installation method
• If the result is too high try a larger cross-section
• Keep the sheet with the project files for review

Frequently asked questions

Where do I get mV/A/m?

From the cable manufacturer catalogue for each size and installation method.

What is the allowed limit?

It depends on the code and project, so enter the value you are required to use.

Download the sheet

Press the download button at the top of the page to get an Excel file ready to edit. The sheet is also available in Arabic from the language switcher.

Note: this sheet is for early estimates and day-to-day help. Have a qualified engineer verify results against the applicable code before construction.