The loss of voltage along a circuit caused by the impedance of the cable. Excessive drop impairs equipment performance.
$$S = \frac\sqrtI^2 \times tK$$
The base current rating of the cable ($I_t$) is calculated using the formula: calculating cable size
Vd = (Ib × L × (R' cosφ + X' sinφ) × 2) / 1000 The loss of voltage along a circuit caused
Standard regulations usually limit voltage drop to for lighting and 5% for power. calculating cable size