Earthing Cable Sizing Best -

Formula (copper, 1 second fault):

| Largest service conductor (AWG/kcmil Cu) | GEC size (AWG Cu) | |------------------------------------------|-------------------| | 2 AWG or smaller | 8 AWG | | 1/0 – 4/0 | 4 AWG | | 250 – 500 kcmil | 2 AWG | | Over 1100 kcmil | 3/0 AWG | Used for large installations (generators, substations, industrial plants). earthing cable sizing

[ S = \frac\sqrtI^2 \times tk ]

[ A_mm^2 = I \times \sqrt\fract\Delta T \times k ] Formula (copper, 1 second fault): | Largest service