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    Construction & Electrical

    Cable ampacity calculator

    Select the installation country before calculating: South Korea uses KEC-referenced KS tables and the USA uses NEC 2023 reference conditions. Korean sizes use mm²; US sizes use AWG or kcmil. Enter essential values first, then expand installation conditions and calculation details when needed.

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    Copper · XLPE 90°C · 30°C ambient · 1 circuit. Additional conditions below.

    Change site conditions
    Calculation basis

    KEC 232.5.2 references KS C IEC60364-5-52, confirmed 2024-07-31 (identical to IEC Edition 3). Copper only, B2/C, 2/3 loaded conductors, 1.5–300 mm².

    Automatic breaker selection gives a general-wiring rated-current candidate, not a specific product or final protection design. Motors, HVAC, welders, fault interrupting capacity and protective coordination require separate selection. The candidate sets are 15–630 A for Korea and 15–600 A for USA; US 10 A special applications are excluded. Thermal/rating reference only. Voltage drop, fault withstand, disconnection, manufacturer/terminal limits and special installation conditions require separate verification. Basis reviewed 21 October 2026.

    Check actual installation conditions before selecting a cable.

    Result

    Worked examples

    South Korea · 6 mm² Cu XLPE; 3 loaded; B2; 40°C; 2 bunched circuits

    44 × 0.91 × 0.80 = 32.032 A

    The 30°C single-circuit reference is reduced for warmer air and grouped circuits.

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