Where:
$$Z_s = Z_e + (R_1 + R_2)$$
$$% \textDrop = \fracV_dV_supply \times 100$$ calculation of cable size formula
S=I2×tkcap S equals the fraction with numerator the square root of cap I squared cross t end-root and denominator k end-fraction Minimum cross-sectional area ( mm2m m squared I: Fault current (Amps). t: Disconnection time of the protective device (Seconds). Where: $$Z_s = Z_e + (R_1 + R_2)$$
Iz=It×Cg×Ca×Ci×Cfcap I sub z equals cap I sub t cross cap C sub g cross cap C sub a cross cap C sub i cross cap C sub f Itcap I sub t : The tabulated current rating (from a standard table). Cgcap C sub g calculation of cable size formula