A chart that suggests 25mm² for PVC might only require 16mm² for XLPE. If you blindly follow a chart without checking the insulation type column, you are either overspending on copper or dangerously undersizing your protection.
Where:
Different regions use different methods. The most common approaches: earth cable sizing chart
Always cross-reference your chart selection with a calculated verification using the adiabatic equation. It takes two minutes and could save a life. ⚡ A chart that suggests 25mm² for PVC might
If you have ever looked at an and simply picked a number because "the table said so," you are missing the physics behind the safety. : Often requires 25 mm² to 95 mm²
: Often requires 25 mm² to 95 mm² to handle high fault currents from heavy machinery.
Here is a deep dive into what that chart is actually telling you.