Wind-sun.com wrote:
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).
Won't make a noticeable difference in the small stuff in this industry
most all of the time.
Brian Teitelbaum said:
Is that true even for non-ferrous metals, like aluminum, or say, gold?
Yes. Anything that conducts electricity would be susceptible to eddy
currents. (IF it ~did~ create a problem that is)
I don't know why anyone here would normally run just one wire through a
box or conduit though.
boB
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"
<bteitelb...@aeesolar.com>
To: "RE-wrenches" <re-wrenches@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-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@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 <j...@asis.com> wrote:
From: jay peltz <j...@asis.com>
Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
To: "RE-wrenches" <re-wrenches@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 <j...@asis.com>
wrote:
>
>> From: jay peltz <j...@asis.com>
>> Subject: [RE-wrenches] solid vs stranded AC
vs DC
>> To: "RE-wrenches" <re-wrenches@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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