[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
>> 69 Railroad Avenue, Suite A-7
>> Hilo, Hawaii 96720 USA
>> (808) 969-3281, fax 934-7462
>>
>>
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>>
>>
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>> David Brearley, Technical Editor
>> SolarPro magazine
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