[RE-wrenches] Wire sizing calculator online

Sun Feb 3 20:48:50 PST 2013

Hi William,

I am unsure what others refer to, I have used the attached spreadsheet in
the past, I think it originates from New Mexico. I have added a reference to
cross sectional area.

On the issue if resistance, I wonder how much cable is pure copper these
days, we see a lot of cheap cable out of Asia that very likely has
additives. I am guessing that one might need to go back to the supplier to
be sure of resistance if that were possible.

You will see in the spreadsheet reference to NEC 2005, chapter 9, table 8 –
this is very comprehensive and includes resistance – among other places, it
can be found nicely laid out here

http://www.buildmyowncabin.com/nec/nec2005_chap9_table8.html

This is good for DC only I believe.

I could ask contacts I have in Germany what they use, I would guess they
have it tied down to the last ohm

Hope this helps

Regards
Carl Emerson

Carl:

You are very welcome.  

I'd be willing to provide a metric chart.  I need some information to get
started.  In the US, practices are dictated by our NEC which provides the
resistance values for standard wire gauges.  By putting the values in the
Code, it gives all parties a reference and (hopefully) avoids arguments
about conflicting data.

I downloaded the New Zealand Electrical Code of Practice (NZECP 51:2004) and
did not find in it any resistance values.  Is this the correct document to
look in?  Are resistance values in there and I am just not finding them?  If
the values are not in the NZECP, where do professionals in New Zealand look
for the resistance values?

There is a slight difference in resistance (impedance) between AC and DC
circuits as listed in the NEC.  I used the higher values to allow conformity
in all cases.  Let me know if there is a different consideration for AC
versus DC in New Zealand.

Do you know what other Metric based nations use for determining wire
resistance values?

Thanks in advance.

William Miller

At 04:32 PM 2/3/2013, Carl Emerson wrote:

Hi William,

Just a comment on the spreadsheet.

You have made provision for Centigrade, being friendly to those outside USA.

It would be nice to have reference to wire cross sectional area in mm² as
AWG is foreign to lots of folks from outside the US who reference your site.

I must say that your making information freely available over the years has
assisted many.

Regards
Carl Emerson

fcb06a.jpg
 022 630 9689
 carl at solarking.net.nz
 solarking.net.nz
 PO Box 305-130,
 Triton Plaza,
 Auckland 0757 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: 4 February 2013 12:06 p.m.
To: RE-wrenches
Subject: Re: [RE-wrenches] Wire sizing calculator online

Todd:

Thanks for the plug.  The copy you have is outdated.  Here is where you will
find the new and improved version:
http://millersolar.com/MillerSolar/Resources/_Resources.html

What we created in the Miller Solar wire sizing spreadsheet is an
opportunity to compare the voltage drop for all common wire sizes in one
view so you can evaluate the tradeoffs for various scenarios.

Questions or comments are appreciated.

William Miller

At 09:54 PM 2/1/2013, toddcory at finestplanet.com wrote:

thank you... this is useful. do you have william millers calculator too? its
attached in case you dont.

todd

On Friday, February 1, 2013 5:23pm, "Solarguy" <ntrei at 1scom.net> said:

I stumbled onto this wire sizing calculator that gives NEC qualified data. 
Wikipedia had a link to it.
http://www.cablesizer.com/
Jim Duncan
North Texas Renewable Energy Inc
www.ntrei.com <http://www.ntrei.com/>  
NABCEP PV 031310-57
TECL-27398
ntrei at 1scom.net 
817.917.0527
NABCEP Logo

Sent from Finest Planet WebMail.

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