[RE-wrenches] voltag drop

David Brearley david.brearley at solarprofessional.com
Mon Dec 8 19:03:56 PST 2008


This seems more convenient than remembering the constants for copper and
aluminum. Please note that I did not give the complete units for those in my
previous email. The units for ³k² in those formulas is ohms/mil foot.


On 12/8/08 6:48 PM, "Michael Gullo" <mgullo3 at comcast.net> wrote:

> Marco,
>  
> I use the following formulas:
>  
> single-phase     Vd = (I x L x R x 2)/1000
>  
> 3-phase            Vd = (1.73 x I x L x R)/1000
>  
> L = one-way length
> R = resistance of conductor from Table 8 (usually from uncoated copper ohm/kFT
> column)
>  
>  
> Mike
> Michael Gullo
> Solar Solutions LLC
> Marlton, NJ
> NABCEP Certified PV Installer ™
> mgullo at solarsolutionsnj.com
>  
>>  
>> ----- Original Message -----
>>  
>> From:  Marco <mailto:marco at pvthawaii.com>
>>  
>> To: re-wrenches at lists.re-wrenches.org
>>  
>> Sent: Monday, December 08, 2008 5:12  PM
>>  
>> Subject: [RE-wrenches] voltag drop
>>  
>> 
>>  
>> I feel kinda  foolish in asking this.....but when calculating voltage drop in
>> a conductor  over distance, do I use the one-way or round-trip distance?
>>  
>>  
>>  
>> thanks,
>>  
>> marco
>>  
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>>   
>> 
>>  
>> 
>> Marco  Mangelsdorf, Ph.D., President
>> Electrical Contractor License  C-26351
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>>  
>> 
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