[RE-wrenches] solid vs stranded AC vs DC

[Dave Click]

2% loss is significant, but I think that Darryl was saying that the 
resistance for stranded wire was 2% higher than solid. So if you had a 
3% voltage drop in your system with stranded wire, you could rewire the 
system with solid wire and have a voltage drop of (3% x 0.98) 2.94% at 
peak production; that's less than 1 kWh/yr per kW installed.

DKC

-------- Original Message --------
Subject: Re: [RE-wrenches] solid vs stranded  AC vs DC
From: Joel  Davidson <joel.davidson at sbcglobal.net>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Date: 2009/8/3 20:31

> 2% loss from any resistance source over 25 years is significant.
> 
> ----- Original Message ----- From: "Darryl Thayer" <daryl_solar at yahoo.com>
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Sent: Monday, August 03, 2009 2:04 PM
> Subject: Re: [RE-wrenches] solid vs stranded AC vs DC
> 
> 
> 
> Yes, that is what the code book and my electricians handbook says, but 
> 2% is very little.  I would think that passing through a conduit hole is 
> larger than that.
> Darryl
> 
> --- On Mon, 8/3/09, Matt Tritt <solarone at charter.net> wrote:
> 
>> From: Matt Tritt <solarone at charter.net>
>> 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, 3:49 PM
>>
>>
>>
>>
>>
>>
>> Darryl,
>>
>>
>>
>> Say what?! This would seem to indicate that solid core is
>> actually
>> better for DC than stranded wire. Can this possibly be
>> true??
>>
>>
>>
>> Matt
>>
>>
>>
>> Darryl Thayer wrote:
>>
>>   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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