| mm² | Current in conduit (A) | Current in air (A) | |-----|------------------------|--------------------| | 1.5 | 15.5 | 19.5 | | 2.5 | 21 | 27 | | 4 | 28 | 37 | | 6 | 36 | 48 | | 10 | 50 | 66 | | 16 | 68 | 88 |
Load = 24.5 A, ambient 40°C (k₁=0.87), grouping 4 cables (k₂=0.70) [ I_\textmin = \frac24.50.87 \times 0.70 = \frac24.50.609 \approx 40.2 A ] → Choose cable rated ≥40.2 A from tables. Step 3 – Select Cable Size from Current Rating Table Copper, PVC insulated, 30°C ambient (typical IEC table excerpt): electrical cable size calculations
Common factors: