[RE-wrenches] solid vs stranded AC vs DC

[Wind-sun.com]

See http://en.wikipedia.org/wiki/Eddy_current

The practical effects of running a single wire in 98% of the systems that 
any solar installers will ever see is probably just about zero, and it also 
only applies to AC currents (or rapidly varying DC, which is not common). 
The only time I have ever actually seen this happen was several years ago 
when the leads for a large 30 HP/440AC motor were fed by separate wires, 
each in their own metal conduit (don't ask me why...).

..................................................................................................
Northern Arizona Wind & Sun - Electricity From The Sun Since 1979
Solar Discussion Forum: http://www.wind-sun.com/ForumVB/
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----- Original Message ----- 
From: "Brian Teitelbaum" <bteitelbaum at aeesolar.com>
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Sent: Monday, August 03, 2009 1:12 PM
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC


> Hey Darryl,
>
> You said - " never allow a single wire to pass through a metal surface as 
> this will induce eddy currents and magnetic effects into the metal causing 
> voltage drop and heating"
>
> Is that true even for non-ferrous metals, like aluminum, or say, gold?
>
> Brian Teitelbaum
> AEE Solar
>
>
>
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org 
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Darryl 
> Thayer
> Sent: Monday, August 03, 2009 1:01 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
>
>
> I looked in the code book and found stranded wire has about 2% higher DC 
> resistance than solid, Chapter 9 table 8, and that for AC resistance the 
> same value as DC resistance to within the table accuracy Chapter 9 Table 9
>
> This table points out that for AC resistance it is important to know the 
> conduit system, as the reactance will have an effect.  With AC it is 
> important to never allow a single wire to pass through a metal surface as 
> this will induce eddy currents and magnetic effects into the metal causing 
> voltage drop and heating.
>
> --- On Fri, 7/31/09, jay peltz <jay at asis.com> wrote:
>
>> From: jay peltz <jay at asis.com>
>> Subject: Re: [RE-wrenches] solid vs stranded  AC vs DC
>> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>> Date: Friday, July 31, 2009, 10:01 PM
>> Hi Darryl,
>>
>> But what are the differences and when do they come into
>> play?
>>
>>
>>
>>
>> On Jul 31, 2009, at 7:25 PM, Darryl Thayer wrote:
>>
>> >
>> > Well there is very slight differences between AC and
>> Dc But this
>> > difference
>> > is so slight that it has no effect on anything we will
>> do.
>> > Darryl
>> > --- On Fri, 7/31/09, jay peltz <jay at asis.com>
>> wrote:
>> >
>> >> From: jay peltz <jay at asis.com>
>> >> Subject: [RE-wrenches] solid vs stranded  AC
>> vs DC
>> >> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>> >> Date: Friday, July 31, 2009, 7:00 PM
>> >> HI All,
>> >>
>> >> I'm trying to understand this wire issue.
>> >>
>> >> Whether or not there is a difference between
>> stranded or
>> >> solid wire for DC or AC.
>> >>
>> >> Any takers on this one?
>> >>
>> >> thanks,
>> >>
>> >> jay
>> >>
>> >> peltz power
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>> >
>> >
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>
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