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#35488 - 03/11/04 11:47 PM kcmil?
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
What exactly is a kcmil?.
I realise that it is used on the larger sizes of wire in the US, but what does this term mean?
Sorry but I don't understand this term.
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#35489 - 03/12/04 01:14 AM Re: kcmil?
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Mike take a look here.

http://www.bluesea.com/techtalk/circularmils.htm

This is a little dated as they say MCM we used to use that term now we use Kcmil.

It is the same measurement with a different abbreviation.

Bob
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#35490 - 03/12/04 01:19 AM Re: kcmil?
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA


1 Circular Mil = 1 cmil

1000 Circular Mil = 1 Kcmil

A 250 Kcmil conductor is a conductor with an area of 250,000 Circular Mils

[This message has been edited by iwire (edited 03-12-2004).]
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#35491 - 03/12/04 04:23 AM Re: kcmil?
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
Iwire,
Thanks, mate!.
We have a term over here in New Zealand, (and this is used in a few Non-US countries)
it is called Square Millimetres and gives the Cross-sectional Area of a particular wire or cable, based on the size of the individual wires and the number of such wires.
Here, the wires number 1,3,7,19, in numbers of strands, as the cables get bigger.
That doesn't include CEMPEX flexible Mains conductors that we use inside switch panel enclosures, that may have up to 2000 fine wires, but has the same size as a 1/0 conductor.
Different strokes for different folks, you know!.
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#35492 - 03/12/04 06:50 AM Re: kcmil?
C-H Offline


Member
Registered: 09/17/02
Posts: 1508
Loc: Stockholm, Sweden
Rule of thumb: 1 sq mm = 2 kcmil
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#35493 - 03/12/04 04:25 PM Re: kcmil?
Sandro Offline
Member
Registered: 12/30/01
Posts: 449
Loc: Stoney Creek, ON, Canada
A little history about MCM.... The first M is Italian for "mille" which means thousand. For some strange reason, it got changed to KCM, I believe to mean "Kilo".
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#35494 - 03/13/04 03:19 AM Re: kcmil?
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
C-H, Sandro,
Thanks for your advice.
I just have a wee bit of trouble getting my head around that term.
I think that it is because it is not a familiar one, ie not Metric!.
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Let's face it, these days if you're not young, you're old - Red Green grin
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#35495 - 03/13/04 05:48 AM Re: kcmil?
winnie Offline
Member
Registered: 09/15/03
Posts: 652
Loc: boston, ma
I believe that the change from the use of M to mean 1000x to the use of K is part of a general trend to use metric prefixes. If CM is circular mil, then is MCM 1000000 circular mils or 1000 circular mils.

The problem is that depending upon where you are coming from, the answer is _clearly_ 1000, unless you come from some place where the answer is _clearly_ 1000000.

-Jon
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#35496 - 03/13/04 05:58 AM Re: kcmil?
Sir Arcsalot Offline
Member
Registered: 11/17/03
Posts: 117
Loc: Lynden, Washington
In our state DOT we still use "M" gallons for measurement/payment of water to construction contractors. Apparently it continues to confuse some people from what I've heard. I would much rather use K gallons (or circular mils) instead, it seems that a lot more folks understand K = 1,000 from my experience.
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#35497 - 03/13/04 07:29 AM Re: kcmil?
golf junkie Offline
Member
Registered: 04/22/01
Posts: 511
Loc: York, NE
FWIW.....

MCM is still the common term here. I see kcmil on engineering drawings but that is about it's only usage.
I guess we are just slow to change the old ways.

GJ
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