[RE-wrenches] Combining conductors

[Larry Crutcher, Starlight Solar Power Systems]

Thanks Dan and Nathan. So simply by using the CMA and doubling it I can lookup an equivalent CMA size. That just sounds too easy.

"other code issues..." Since these conductors are attached to separate terminals on each battery, they aren't paralleled but the net result is like paralleling. 


Larry Crutcher
Starlight Solar Power Systems




On Apr 4, 2013, at 10:20 AM, Nathan Stumpff wrote:

Larry,
 
I don’t think the relationship of AWG size to ampacity is a linear curve, so while that “rule of thumb” may be pretty good, you can’t always count on it. I would use the circular area column in NEC Chapter 9, Table 8 for an easy, quick way to compare two of one conductor vs. one of another.
 
Of course there are other code issues regarding parallel conductors…
 
Cheers,
-Nathan
 
--
Nathan J. Stumpff
NABCEP Certified PV Installer #091209-175
NABCEP Certified Solar Heating Installer #032412-14
Project Manager | Arctic Sun, LLC
nathan at arcticsun-llc.com  | (907) 457-1297
www.reina-llc.com | www.arcticsun-llc.com
<image001.png>
 
From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Larry Crutcher, Starlight Solar Power Systems
Sent: Thursday, April 04, 2013 8:51 AM
To: RE-wrenches
Subject: [RE-wrenches] Combining conductors
 
Wrenches,
 
Here's a tough one for me to understand. I am installing 2 volt AGM batteries. There are two terminals for each battery polarity. I have some height limits so I need to use the minimum wire size. Here's my question: If I combine two identical conductors, what is the equivalent single conductor size? 
 
I found one "rule of thumb" that says doubling like conductors creates a AWG decrease of 3. Example: two #2 will be equivalent to 2/0. Is this true?

Thank you,

Larry Crutcher
Starlight Solar Power Systems
 
 



 
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