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/
..................................................................................................
----- Original Message -----
From: "Brian Teitelbaum" <[email protected]>
To: "RE-wrenches" <[email protected]>
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: [email protected]
[mailto:[email protected]] 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 <[email protected]> wrote:
From: jay peltz <[email protected]>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
To: "RE-wrenches" <[email protected]>
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 <[email protected]>
wrote:
>
>> From: jay peltz <[email protected]>
>> Subject: [RE-wrenches] solid vs stranded AC
vs DC
>> To: "RE-wrenches" <[email protected]>
>> 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
>> _______________________________________________
>> List sponsored by Home Power magazine
>>
>> List Address: [email protected]
>>
>> Options & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive:
>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out participant bios:
>> www.members.re-wrenches.org
>>
>>
>
>
>
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: [email protected]
>
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive:
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>
_______________________________________________
List sponsored by Home Power magazine
List Address: [email protected]
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: [email protected]
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: [email protected]
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: [email protected]
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
