[RE-wrenches] voltage drop

[William Miller]

Dear Wind & Sun:

What "standard" are you referring to?  We are using the 75C values from the 
NEC in order to assure code compliance.  We need to have a direct link to 
the NEC in case of compliance or liability issues.

Thanks for asking.

William Miller


At 09:34 PM 12/9/2008, you wrote:
>I looked at the resistance values you have in that spreadsheet. Do you 
>have some kind of "fudge factor" built into it for temperature?
>
>The values in the spreadsheet seem to be the NEC values for 75C. For 
>example, #10 your sheet shows 1.24 ohms/1000 feet, whereas the "standard" 
>at 25C is around.998 to 1.014 ohms.
>
>..................................................................................................
>Northern Arizona Wind & Sun - Electricity From The Sun
>..................................................................................................
>
>----- Original Message ----- From: "William Miller" <wrmiller at charter.net>
>To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>Sent: Tuesday, December 09, 2008 1:27 PM
>Subject: Re: [RE-wrenches] voltage drop
>
>
>>Colleagues:
>>
>>We have a voltage drop spread sheet on our web site.  Excuse any 
>>immodesty, but we feel it is superior to any others we have seen for 
>>several reasons, including the spreadsheet allows you to judge a range of 
>>wire sizes in one glance and you are not limited to standard voltage 
>>(120, 240, etc) like other charts.  I have recently updated the sheet I 
>>use to also account for temperature and conduit fill.  The newest version 
>>is on the web yet, but I will get it there in the next few days.  IN the 
>>meantime, the tried and true tool is at: 
>>http://mpandc.com/resources/resources.html  It is about the fourth item down.
>>
>>I have heard from many installers and designers that they use the sheet 
>>and no one has complained of any inaccuracies.  But, as always, you are 
>>responsible for verifying your results.
>>
>>Good luck,
>>
>>William Miller
>>
>>
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