How To Select Earthing Cable Size Extra Quality ◎

Where:

| Cross-sectional Area of Phase Conductor ($S_phase$) | Minimum Cross-sectional Area of Earth Conductor ($S_earth$) | | :--- | :--- | | | $S_earth = S_phase$ (Same size) | | $16 \text mm^2 < S_phase \le 35 \text mm^2$ | $S_earth = 16 \text mm^2$ | | $S_phase > 35 \text mm^2$ | $S_earth = S_phase / 2$ (Half size) | how to select earthing cable size

✅ Calculate fault current and clearing time ✅ Apply adiabatic equation ( S = \sqrtI^2 t/k ) ✅ Check minimum sizes from your local code table ✅ Increase for mechanical strength, corrosion, or high ambient temperature ✅ Never use earthing cable smaller than 2.5 mm² copper (for fixed wiring) Where: | Cross-sectional Area of Phase Conductor ($S_phase$)