Cable sizing — four checks on real standards

Enter voltage class, load and installation conditions: you get the cable section together with the four checks — ampacity (after correction), voltage drop, short-circuit thermal duty and minimum mechanical section. MV 10 kV ampacity comes from GB 50217-2018 Table C.0.3 (basis: air 40 °C / soil 25 °C, soil resistivity 2.0 K·m/W, 3-core XLPE; table values are for aluminium, copper = aluminium × 1.29). Voltage classes not covered by the loaded tables return no value instead of borrowing from another range.

Standards: GB 50217-2018 (Annex C ampacity, Annex D correction factors, Table 5.1.2 minimum section) · IEC 60287 · GB/T 16895.15 ≈ IEC 60364-5-52 (ambient correction) · GB/T 16895.5 ≈ IEC 60364-4-43 (thermal, S = Ik·√t/K). Every value shown carries its source and basis so it can be re-checked item by item.