Metric (mm²) sizing is refused: no IEC 60364 or วสท. table cells are extracted or verified yet, and the legacy metric rows overstate small sizes, so the engine does not use them. Only AWG/kcmil sizes reach the sparse primary-verified NEC 2023 cells.
Enter positive-sequence X from the actual cable/manufacturer data. Required when power factor is below 1; VerElect will not assume zero reactance.
Required unless the equipment conductor marking below is known. Sets the termination ceiling: 60°C at 100 A or less, 75°C above 100 A — NEC 110.14(C)(1) does not permit an assumed termination temperature.
A separately installed connector stacks its listed temperature as an additional ceiling (110.14(C)(2)).
Required — nothing is pre-selected. Insulation of the actual conductor (TW = 60°C, THW = 75°C, THHN = 90°C). Used as the base for temperature and CCC corrections; the final ampacity is capped by the termination ceiling resolved from the panel above.
Count CCC, including applicable spares. Do not count equipment grounding conductors.
NEC 210.19(A)(1) / 215.2(A)(1): the conductor carries 125% of a continuous load plus 100% of a noncontinuous load. The whole load entered above is treated as the declared class; the rule text is pending primary extraction, so the factor is labelled screening in the derivation.
Select the Conductor Insulation Rating (60, 75 or 90°C) to continue. It is the Table 310.16 column the ampacity and the ambient correction are both read from, so it is a property of the conductor you are installing, not a value this page can pick for you.
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Enter parameters to calculate cable size
- •Branch-circuit screening target: 3% voltage drop
- •Feeder screening target: 3% voltage drop
- •Total screening target: 5% from service to load
- •Continuous loads (max current for 3 h or more): conductor sized at 125% of the continuous load, NEC 210.19(A)(1) / 215.2(A)(1) — applied only when you declare the load continuous; rule text pending primary extraction
Design-policy targets are not code-compliance evidence; verify the applicable code pack and project requirements.
- •Temperature: Higher ambient = lower ampacity
- •CCC: More than 3 current-carrying conductors requires Table 310.15(C)(1) adjustment
- •Installation: Free-air and tray paths require their own verified source rules; no synthetic uplift is used