[ I_req = \fracI_loadk_t \times k_g \times k_s \times \dots ] Step 3: Select Cable from Tables Choose a cable where ( I_rated \ge I_req ). Step 4: Check Voltage Drop Voltage drop formula (single-phase): [ V_d = 2 \times L \times I \times (R_ac \cos\phi + X \sin\phi) ]
[ I_rated \ge I_load \times k_1 \times k_2 \times \dots \times k_n ] cable sizing formula
[ V_d = \sqrt3 \times L \times I \times (R_ac \cos\phi + X \sin\phi) ] [ I_req = \fracI_loadk_t \times k_g \times k_s
Correction factors: ( k_t ) (40°C PVC) = 0.87 ( k_g ) (single circuit) = 1.0 ( k_s ) (air) = 1.0 cable sizing formula