All wire sizes larger than 4 ought AWG are given as KCMIL sizes. KCMIL wire size is the equivalent cross sectional area in thousands of circular mills. A circular mill is the area of a circle with a diameter of one thousandth (0.001) of an inch. Notice that the wire sizes in the KCMIL system increase as the numbers get larger, which is exactly opposite from the AWG system.

Wire Size Graphic