circular mil

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circular mil

A unit of cross-sectional measurement, especially of wire, equal to the area of a circle with a diameter of one mil.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

circular mil

(Units) a unit of area of cross section of wire, equal to the area of a circle whose diameter is one thousandth of an inch. 1 circular mil is equal to 0.785 × 10^–6 square inch or 0.2 × 10^–9 square metre

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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1 circular mil = 5.067 * [10.sup.10] [m.sub.2] = 5.067 * [10.sup.^-4] [mm.sup.2]

PCB fusing currents: why, relatively speaking, wider traces are quicker than narrower ones to reach the fusing temperature

To convert it to circular mils (because that is the form of Onderdonk's Equation) and [Log.sub.10], recognize the following relationships:

Who were Preece and Onderdonk? The first men to investigate the maximum current a copper conductor can carry before it starts to melt devised lasting equations

In Lane's original system, 70 feet of 2/0 wire (see table for circular mils) was used to carry a maximum of 26 amps: