!!top!! — Loop Impedance Calculation

[ Z_{internal} \approx \frac{2 \times L \times \rho}{A} ]

( I_f = 230 / 1.796 \approx 128 , A ).

( Z_s = Z_e + R_{round-trip} = 0.35 + 1.446 \approx 1.796 , \Omega ). loop impedance calculation

where ( I_a ) is the current causing automatic operation of the OCPD within the specified disconnection time (e.g., 0.4 seconds for final circuits up to 32 A, or 5 seconds for distribution circuits). [ Z_{internal} \approx \frac{2 \times L \times \rho}{A}

[ I_f = \frac{V_0}{Z_s} ]

For safety, the following condition must be satisfied: the following condition must be satisfied: