Larry: Yep, it basically that easy. To paraphrase the handbook...
Conductors connected in parallel are treated by the Code as a single conductor with a total cross-sectional area of all conductors in parallel. The main requirements for parallel conductors are in Article 310.10(H). Larger than 1/0 each, etc. There are some related requirements for conductor routing and equipment ground conductors as well. Best Regards, John Berdner General Manager, North America SolarEdge Technologies, Inc. 3347 Gateway Boulevard, Fremont CA 94538 USA (*Please note of our new address.) T: 510.498.3200, X 747 M: 530.277.4894 From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Larry Crutcher, Starlight Solar Power Systems Sent: Thursday, April 04, 2013 11:46 AM To: RE-wrenches Subject: Re: [RE-wrenches] Combining conductors 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 nat...@arcticsun-llc.com <mailto:nat...@arcticsun-llc.com> | (907) 457-1297 www.reina-llc.com<http://www.reina-llc.com> | www.arcticsun-llc.com<http://www.arcticsun-llc.com/> <image001.png><http://www.facebook.com/ArcticSunLLC> From: re-wrenches-boun...@lists.re-wrenches.org<mailto:re-wrenches-boun...@lists.re-wrenches.org> [mailto:re-wrenches-boun...@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 _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org> CONFIDENTIALITY NOTICE: This e-mail and its attachments are intended only for the use of the individual or entity who is the intended recipient and may contain information that is privileged, confidential and exempt from disclosure or any type of use under applicable law. If the reader of this e-mail is not the intended recipient, or the employee, agent, or representative responsible for delivering the e-mail to the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this e-mail is strictly prohibited. If you have received this e-mail in error, please reply immediately to the sender. P Please think of the environment before printing this email
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