kcmil to inches?

Question

I am looking for a conversion from kcmil to inches. I am using 650 kcmil welding cable for a design project but need to know what 650kcmil = in Inches. in other words the dia. in inches of a 650kcmil wire

Answer 1

One kcmil is "1000 circular mils".

A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil. A mil is one thousandth of an inch. A circular mil is not the true cross sectional area of a wire, and therefore is useless for many actual calculations involving true area. Circular mils can be a convenient unit for comparing the area of the cross section of various wires or cables that have circular cross sections, without the need to reference pi. The the area of a wire or cable listed in circular mils is a uniquely American unit, not used by much of the rest of the world. The circular mils unit of area should be used with care, since some confusion and potential error can result from the lack of pi in its definition. An example of this is when looking up the resitivity of metals. It is common to see two completely different resistivity values given for the same metal or alloy; one for sheet metal (whose calculation is based on the true cross sectional area) and a second very different value for round wire (where circular mils are substituted for the true area).

The area in circular mils, A, of a circle with a diameter of d mils, is given by: A = d^2

In wire gauge (cable sizing), the acronym MCM or kcmil means a thousand circular mils.

1 circular mil is equal to about 0.7854 millionths of a square inch (1 square inch is equal to about 1.273 million circular mils)

650,000 cmil x .7854 millionths of a sq. inch = .510 sq. inch.

Answer 2

Circular Mils To Inches

Answer 3

This Site Might Help You.

RE:
kcmil to inches?
I am looking for a conversion from kcmil to inches. I am using 650 kcmil welding cable for a design project but need to know what 650kcmil = in Inches. in other words the dia. in inches of a 650kcmil wire

Answer 4

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Answer 5

*Circular Mil – A unit of cross-sectional area, commonly used to express the area of conductor which is the area of a circle,
.001 inches in diameter.
*Area=3.14*diameter^2/4
Area=3.14*[0.001]^2/4
AREA of 1 circular mil
=0.000000785 INCH^2
*AREA of 1 kilo circular mil
=0.000000785*1000 INCH^2
=0.000785 inch^2
*AREA of 650 kilo circular mil
=0.000785**650 INCH^2
=0.51025 inch^2
[*kcmil – Thousands circular mil, a unit of area used to describe electrical conductors.]
Area=3.14*d^2/4
0.51*4=3.14*d^2
2.041/3.14=d^2
0.65=d^2
d=sqrt[0.65] inch
d= 0.81 inch.
Please refer:
http://www.amerifiber.com/old_site/powercablespecifications.htm
http://www.generalcable.com/NR/rdonlyres/BF15DEF5-8F68-41C5-BE04-01A3A0D4F3A0/0/pg5.pdf
http://www.bussmann.com/library/bifs/1042.PDF- Here , you will find diff. values of diameter for 500 kcmil.
*Its depends on volts also.

Answer 6

Wow! thank you! exactly what I was searching for. I looked for the answers on other websites but I couldn't find them.