Charts may not account for extremely long cable runs where voltage drop or impedance becomes a factor.
This is the "shortcut" method. For smaller installations, you simply match the earth wire to the phase wire size up to 16mm². For cables larger than 35mm², the earth wire is generally required to be at least half the size of the phase wire. 2. The Adiabatic Equation (The Calculation Method) earth cable size selection chart
There are two ways to determine the size, and you must choose the one that results in the larger cable. Charts may not account for extremely long cable
This is the calculation method used when you want to minimize cable size or when the fault current is very high. It ensures the cable doesn't melt during a short circuit. For cables larger than 35mm², the earth wire
When it comes to electrical installations, ensuring the safety and reliability of earthing systems is paramount. A crucial aspect of this is selecting the correct earth cable size. An earth cable, also known as an earthing cable or grounding cable, is designed to provide a safe path for electrical currents to flow into the earth in case of a fault, thereby protecting people and equipment. The size of the earth cable is critical because it must be able to carry fault currents without overheating.