Cable Sizing Formula 🎁

Short-circuit thermal check (k for Cu/PVC = 115): [ A_min = \frac10,000 \times \sqrt0.1115 \approx 27.5 \text mm^2 ] 25 mm² is slightly below → upgrade to 35 mm² for fault withstand.

[ A_min = \fracI_sc \times \sqrttk ]

But for sizing, we use the formula:

From table — 25 mm² Cu/PVC (rated ~110 A in air at 30°C). Acceptable. cable sizing formula

[ 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) ] Short-circuit thermal check (k for Cu/PVC = 115):

[ 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