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.
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Northern Arizona Wind & Sun - Electricity From The Sun
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----- Original Message ----- From: "William Miller" <[EMAIL PROTECTED]>
To: "RE-wrenches" <[email protected]>
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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