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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hi Wrenches –<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I’ve noticed discrepancies in load rating methods for various modules and wondered if there was any insight from the installer community. REC claims 113 PSF, Sharp claims only 50PSF. Solarworld notes 50PSF load rating, but 113 PSF snow load rating. I’m assuming the difference is that snow load rating is greater because its assumed to be widely distributed, but yet its still per square foot so perhaps not. Is a Sharp module such as the 240NUQ-240F2 as durable as REC, Evergreen, Solarworld etc and they are just more honest in their portrayal of load rating.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks for your help,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Rich<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Gary Willett<br><b>Sent:</b> Monday, October 03, 2011 4:33 PM<br><b>To:</b> re-wrenches@lists.re-wrenches.org<br><b>Subject:</b> Re: [RE-wrenches] interrupting current calculations used to determine the interrupting of the AC equipment.<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:13.5pt;line-height:115%'>James:<br><br>I believe your PE is referring to the short circuit current calculations of 110.10, and the 110.24 marking requirements for AFC (Available Fault Current). The utility company should be able to give you the AFC at the secondary of their transformer, or better yet - at the service equipment.<br><br>The short circuit current rating of the utilization equipment, and the AIC (Available Interrupting Current) rating of the OCPD in the utilization equipment, must exceed the AFC.</span><o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'>Regards,<br><br>Gary Willett, PE<br><br><o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='color:#1F497D'><br><br></span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;line-height:115%;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;line-height:115%;font-family:"Tahoma","sans-serif"'> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>James Rudolph<br><b>Sent:</b> Monday, October 03, 2011 1:54 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] interrupting current calculations used to determine the interrupting of the AC equipment.</span><o:p></o:p></p></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Dearest Wenches,<br><br> I received an e-mail from PE reviewing one of our projects to build, and this is what they wrote-<br><span style='font-family:"Arial","sans-serif"'><br>No interrupting current calculations were included. It is suggested the utility company be consulted for available at the service entrance and these values be used to determine the interrupting of the AC equipment.</span><br><br>Does any one out there have experience dealing with this issue, or have the ability to shed some light on this subject.<br><br>Many thanks in advance,<br clear=all><br>-- <br><b>James B Rudolph<br>NABCEP Certified PV Installer<br><br><br></b><o:p></o:p></p><p class=MsoNormal style='margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br><br><br><o:p></o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre>List sponsored by Home Power magazine<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Options & settings:<o:p></o:p></pre><pre><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List rules & etiquette:<o:p></o:p></pre><pre><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Check out participant bios:<o:p></o:p></pre><pre><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre></blockquote></div></body></html>