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The earth wire should be the same size as the phase wire. 16 mm² < S ≤ 35 mm²: The earth wire should be 16 mm² .
| Width x Thickness (mm) | Cross-Sectional Area (mm²) | Approx. Weight (kg/m) | | :---------------------: | :------------------------: | :-------------------: | | | 60 mm² | 0.53 | | 25 x 3 | 75 mm² | 0.67 | | 30 x 4 | 120 mm² | 1.07 | | 40 x 4 | 160 mm² | 1.42 | | 50 x 5 | 250 mm² | 2.23 | | 50 x 6 | 300 mm² | 2.67 | | 60 x 6 | 360 mm² | 3.20 | | 80 x 6 | 480 mm² | 4.27 | | 100 x 6 | 600 mm² | 5.34 |
The Importance of Earth Cable Size. Cable size is crucial, as its cross-sectional area directly determines the current it can carr... Dongguan Greater Wire & Cable Co., Ltd 5.4.4 - Protective conductor cross-section assessment If the circuit concerned is in the form of a ring, one quarter of the resistance of the complete protective conductor round the ri... TLC Electrical Supplies Earth Bonding Cable Size Selection - Eland Cables Earth Bonding Cable Size Selection. Guidance on earth conductor and protective bonding conductor cross-sectional areas is given in... Eland Cables LEARN SAFE EARTH CABLE SIZING Sizing an earth cable is an important step in ensuring the safety and performance of an electrical system. The earth cable plays a... Electrical Projects Australia how to calculate Earthing conductor size Jul 14, 2025 —
If you need to calculate the exact size rather than using the table (for example, if the earth cable is a different material than the phase cable, or if fault current is unusually high), use the :
| OCPD Rating (Amps) | Copper EGC Size (AWG) | Copper EGC Size (mm²)* | |--------------------|-----------------------|------------------------| | 15 | 14 AWG | 2.1 | | 20 | 12 AWG | 3.3 | | 30 | 10 AWG | 5.3 | | 40–60 | 10 AWG | 5.3 | | 100 | 8 AWG | 8.4 | | 200 | 6 AWG | 13.3 | | 300 | 4 AWG | 21.2 | | 400 | 3 AWG | 26.7 | | 500 | 2 AWG | 33.6 | | 600 | 1 AWG | 42.4 | | 800 | 1/0 AWG | 53.5 | | 1000 | 2/0 AWG | 67.4 |
Would you like a printable chart or help calculating earth size using the adiabatic equation for a specific fault current level?
Earth wires buried directly in the soil often require a minimum of 16mm² or 25mm² to account for corrosion and mechanical stress, regardless of the circuit load.
The earth wire should be the same size as the phase wire. 16 mm² < S ≤ 35 mm²: The earth wire should be 16 mm² .
| Width x Thickness (mm) | Cross-Sectional Area (mm²) | Approx. Weight (kg/m) | | :---------------------: | :------------------------: | :-------------------: | | | 60 mm² | 0.53 | | 25 x 3 | 75 mm² | 0.67 | | 30 x 4 | 120 mm² | 1.07 | | 40 x 4 | 160 mm² | 1.42 | | 50 x 5 | 250 mm² | 2.23 | | 50 x 6 | 300 mm² | 2.67 | | 60 x 6 | 360 mm² | 3.20 | | 80 x 6 | 480 mm² | 4.27 | | 100 x 6 | 600 mm² | 5.34 |
The Importance of Earth Cable Size. Cable size is crucial, as its cross-sectional area directly determines the current it can carr... Dongguan Greater Wire & Cable Co., Ltd 5.4.4 - Protective conductor cross-section assessment If the circuit concerned is in the form of a ring, one quarter of the resistance of the complete protective conductor round the ri... TLC Electrical Supplies Earth Bonding Cable Size Selection - Eland Cables Earth Bonding Cable Size Selection. Guidance on earth conductor and protective bonding conductor cross-sectional areas is given in... Eland Cables LEARN SAFE EARTH CABLE SIZING Sizing an earth cable is an important step in ensuring the safety and performance of an electrical system. The earth cable plays a... Electrical Projects Australia how to calculate Earthing conductor size Jul 14, 2025 —
If you need to calculate the exact size rather than using the table (for example, if the earth cable is a different material than the phase cable, or if fault current is unusually high), use the :
| OCPD Rating (Amps) | Copper EGC Size (AWG) | Copper EGC Size (mm²)* | |--------------------|-----------------------|------------------------| | 15 | 14 AWG | 2.1 | | 20 | 12 AWG | 3.3 | | 30 | 10 AWG | 5.3 | | 40–60 | 10 AWG | 5.3 | | 100 | 8 AWG | 8.4 | | 200 | 6 AWG | 13.3 | | 300 | 4 AWG | 21.2 | | 400 | 3 AWG | 26.7 | | 500 | 2 AWG | 33.6 | | 600 | 1 AWG | 42.4 | | 800 | 1/0 AWG | 53.5 | | 1000 | 2/0 AWG | 67.4 |
Would you like a printable chart or help calculating earth size using the adiabatic equation for a specific fault current level?
Earth wires buried directly in the soil often require a minimum of 16mm² or 25mm² to account for corrosion and mechanical stress, regardless of the circuit load.
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