What you get
Estimate cable cross-section from current, length and allowed voltage drop. This guide does not replace an installation safety assessment.
How to use it
Enter only the requested values and check the unit shown beside each field. The main result gives the figure to use first. Details explain conversions, secondary quantities and rounding. Change any value to compare another situation without starting again.
Before using the result
Use the actual installation data and check every unit. Cable sizing, protection choices and safety-critical electrical work must still be checked against the applicable rules.