[RE-wrenches] solid vs stranded AC vs DC

[Darryl Thayer]

Yes, all metals (the conductive nature of metals allows currents to flow in the presence of changing magnetic fields), this is enhanced when ferro magnetic metals are involved. I have seen it a few times when AC currents are involved.  This is not the case with DC, but we are not really working with DC when the input to an inverter is involved.  It is a pulsing DC or it can be thought of as a DC and an AC added together.  

However I am not aware of how large an effect it is in most Solar circuits.  But we want to be sure our systems perform well, so watch out for it.
Darryl 

--- On Mon, 8/3/09, Brian Teitelbaum <bteitelbaum at aeesolar.com> wrote:

> From: Brian Teitelbaum <bteitelbaum at aeesolar.com>
> Subject: Re: [RE-wrenches] solid vs stranded  AC vs DC
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Monday, August 3, 2009, 3:12 PM
> 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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