Kcmils

[kda3310]

In the states we us wire or cable that is sized by AWG. Over here in Iraq we use cable that is sized by MM Squared. My problem is how do I find the KCMILS of millimeter sized cable to do voltage drop calculations.

 

[George Stolz]

I'd just use table 8 to get approximations, depending on what you got going.

View attachment 808

 

[eric stromberg]

1 sqmm. = 1.97 kcmil

 

[eric stromberg]

Here's a little chart i made up:

View attachment 809

 

[Pierre C Belarge]

Eric
How accurate is your table?
I have looked on Manufacturer's sites for mm sizing and they are much closer to Table 8 than the sizes you have posted.

 

[cadpoint]

I think caution is in order here, where is the Material is to come from?

Note this page of euporean wire supppliers and their conversation charts to whats made as opposed to (implyed) with a math conversation.
http://www.simetric.co.uk/siwire_elect.htm

The point is two fold: 1st is the cost money wise to make .001 and even .01 product is very high in the manufacturing process. Note where their decimal point is.

Table 8 was made under controlled conditions.

Granted roundup and all that, I just got struck by where the decimal place is.

!!! Thanks for Serving !!!

 

[eric stromberg]

Eric
How accurate is your table?
I have looked on Manufacturer's sites for mm sizing and they are much closer to Table 8 than the sizes you have posted.

Pierre,
Thanks for keeping me on my toes, but i'm not sure i understand your question. All the AWG sizes on my chart agree with Table 8. A circular mil is the area of a circle that has a diameter of .001 inches. The conversion from square millimetre to kcmil is a purely mathematical conversion. Now, if you are talking about ampacity, that is a totally different subject. European Ampacities are higher for the same size conductor as AWG. K is another issue. Just what is the value? Great question. There are threads in this forum that discuss this at length. But sqmm to kcmil is a hard and fast mathematical conversion. The table is accurate. It may not be applicable to ampacity or K, but it is accurate.

Cadpoint,
You bring up a good point, i should lose the decimals. The decimals are not meant to ascribe any accuracy. Since these are not standard mm^2 sizes anyway, i didn't think it made any difference. The mm^2 sizes are given in column 2 and they are what they are. The mm^2 sizes of the AWG are simply for comparison.

 

[bsh]

to convert US to metric multiply the circular mil size by .000567. This will give you square milimeters. if yo have square MM multiply by 1973.5 to get circular mills. remember this is CM not MCM. The table that Eric Stromberg provided is correct, I have a calculator that stores fomulas so that is what I use. Thanks for serving.