Ampacity
Wire Ampacity Chart: NEC Table 310.16 Copper and Aluminum at 60, 75 and 90 C, Termination Rules, Temperature Correction and Bundling Derating
NEC Table 310.16 ampacities for THHN, THWN, XHHW and USE from 14 AWG to 1000 kcmil in copper and aluminum, why the 75 C column is the one that usually governs, the small-conductor cap in 240.4(D), the ambient correction and conductor-count adjustment factors, and how the lug's temperature rating ties the whole thing together.
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