Introduction Selecting the correct electrical cable size is one of the most critical decisions in any electrical installation—whether it’s a low-voltage automotive circuit, a residential feeder, or a high-voltage industrial distribution network. An undersized cable overheats, destroys insulation, causes fires, and creates excessive voltage drop. An oversized cable wastes material, increases cost, adds unnecessary weight, and may be difficult to terminate.
#2 AWG: 1.54 ohms/1000 ft → R = 0.46 ohms → VD = 9.2V (7.7%) – getting close. electrical cable size
[ VD = 2 \times K \times I \times L / A ] Introduction Selecting the correct electrical cable size is
[ A = \frac\sqrtI_sc^2 \times tk ]
Example: 90°C wire in 50°C ambient → factor 0.71. NEC 310.15(C)(1): More than 3 current-carrying conductors in a raceway or cable. a residential feeder