[RE-wrenches] solid vs stranded AC vs DC

[boB Gudgel]

Matt Tritt wrote:
> 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
>

The reason that stranded is higher resistance than solid is that there 
is more "air" in between the strands.  Solid
wire doesn't have that empty space.  It's harder to maneuver though and 
can be harder on breaker studs for the
big stuff.   Stranded doesn't have any (or VERY little) effect on AC 
since the strands are not normally insulated
from each other.

However, multiple strands of insulated magnet wire in transformer 
manufacturing and other things DO have positive effects
and is done all the time to reduce high frequency effects.

boB





> 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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