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--></style></head><body bgcolor="white" lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Peter:</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">I think it is a mistake to not locate a sub-panel in the house. Running branch circuits 45 feet to a separate building is not efficient or practical.</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Voltage drop: 1% VD is a choice, not a requirement. Code requires 3% on feeders and 5% cumulative on AC branch circuits. I like to use 1% for average voltage drop for PV because of the cost of wasted PV energy. I am more lax on AC circuits. If I calculate a PV feeder for 1%, that drop will occur only occasionally, when peak solar is achieved. Analyze your load or charging profiles and look for a calc that provides the chosen VD for average use. Analyzing PV energy curves over a given day, approximately 50% of the energy is under the bell curve.</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Neutrals are current carrying. Try powering a 120VAC load without one and you will see what I mean.</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">William Miller</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><img width="64" height="28" id="Picture_x0020_1" src="cid:image003.jpg@01D19BB8.0CDFB410" alt="Gradient Cap_mini"><br>Lic 773985<br><a href="http://www.millersolar.com/"><span style="color:blue">millersolar.com</span></a><br>805-438-5600</span></p></div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"> </span></p><div><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;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 [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Peter Parrish<br><b>Sent:</b> Thursday, April 21, 2016 8:57 AM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> [RE-wrenches] Does a Netral COunt as a CCC</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I am working with a customer who is doing a complete remodel and addition to his house: stripped to the open studs and floor joists, and rafters. Not a wire in the house. We have designed a 14.4 kWp PV system with 16 kW of storage for backup and load shifting. The main panel, inverters, critical load subpanel and batteries are all going to be in the garage which is about 45 feet from the house. The customer and I have identified the critical loads.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The GC is running conduit from the main house to the garage. I have been given seven (7) 1-1/2” PVC conduits, and I am currently doing conduit fill, ampacity and voltage drop calculations for the branch circuits that represent the critical loads.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">So I have two questions:</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style="mso-list:Ignore">(1)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Should I stick to a <1% voltage drop on all circuits?</span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style="mso-list:Ignore">(2)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Do 120 V neutrals count as current carrying conductors? I think they do, but the electrician stated quite emphatically that they didn’t. I thought that the derating calcs for CCCs were based solely on ohmic losses and phasing was not taken into account.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Does the NEC provide guidance on this latter situation?</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo4"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Peter Parrish</span></p><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Peter T. Parrish, Ph.D.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">President, SolarGnosis</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">1107 Fair Oaks Ave.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Suite 351</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">South Pasadena, CA 91030</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(323) 839-6108</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="mailto:petertor@pobox.com">petertor@pobox.com</a></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p></div></body></html>