[RE-wrenches] Parallel Wire combining

[boB at midnitesolar.com]

VERY nice example, Jarmo !

Hey, one day, probably after we are all gone, maybe everybody will be 
using high temperatue
superconductors and we won't have to worry about wire size any more.

If they can make them work well with AC....

boB

On 12/2/2014 4:26 PM, Jarmo.Venalainen at schneider-electric.com wrote:
> Hi:
>
> Look at it this way,
>
> The three conductors in parallel can handle more current because they 
> have more surface area with which to dissipate heat.  Or to put it 
> another way, the heat from the middle of the thick 975 kCM cant get 
> out and so the wire stays hotter.
>
> See picture,
>
>
>
> JARMO
> _____________________________________________________________________________________
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> Jarmo Venalainen*  | *Schneider Electric **|  Solar Business*  | 
> *CANADA*  | *Training & Development Specialist - Senior* *
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>
> From: 	Larry <larry at starlightsolar.com>
> To: 	RE-wrenches <re-wrenches at lists.re-wrenches.org>,
> Date: 	12/02/2014 03:30 PM
> Subject: 	Re: [RE-wrenches] Parallel Wire combining
> Sent by: 	"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>
>
>
> ------------------------------------------------------------------------
>
>
>
> Hey boB,
>
> This is the reference table I was using. They show 325 AWG and 325kCM 
> refer to the same diameter cable but I should have used kcm for clarity.
>
> If all insulation/temp rating is the same we are back to my original 
> question. Anyone else able to explain this? To be safe I am leaning 
> toward using the combined CM number to size for current rather than 3 
> times the ampacity as that just makes no sense to me.
>
>
> On 12/2/14 3:54 PM, _boB at midnitesolar.com_ 
> <mailto:boB at midnitesolar.com>wrote:
>
> The "area" of the conductor will be 3 times and you would think that 
> the NEC Ampacity would also be 3 times
> that of one conductor.   But one LARGE conductor with the same area 
> might not be as high as you think
> because of insulation.  I would think that ampacity of 3 cables in 
> parallel would be 3 times.  But probably
> not when you take a single cable of the 3X area out of the NEC table. 
> (I haven't looked at this to verify)
>
> Also,  Larry,  325 AWG 750 AWG (gauge) wire is a bit too small for 
> this, don't you think ?
>
> I know...  You mean circular mils...
> boB
>
>
>
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