<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi Howie,</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">As usual, the code is not written as clearly as it could be, but 705.12(D)(2)(3)(b) starts out by stating "Where two sources, one a utility and the other an inverter", so I think that the only logical interpretation is that when it says "the sum of 125 percent of the inverter(s) output circuit current and the rating of the overcurrent device protecting the busbar", that the latter refers to the main breaker protecting the busbar from the utility. </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Cheers,</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Mark</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font><font><font><font>----</font></font></font></font></div><div dir="ltr"><div><div dir="ltr" style="font-size:12.8px"><font face="Calibri"><span style="font-size:15px"><font color="#0076be">Mark Westbrock</font><font color="#666666">| VP, Branch Manager | Employee Owner</font></span></font></div><div dir="ltr" style="font-size:12.8px"><font color="#666666" face="Calibri"><span style="font-size:15px"><div style="font-family:tahoma,sans-serif;font-size:small;color:rgb(68,68,68);display:inline">NABCEP\u2122 Certified PV Installation Professional</div></span></font></div><div dir="ltr" style="font-size:12.8px"><span style="color:rgb(68,68,68);font-family:tahoma,sans-serif;font-size:small">NABCEP\u2122 Certified </span><font color="#666666" face="Calibri"><span style="font-size:15px"><div style="font-family:tahoma,sans-serif;font-size:small;color:rgb(68,68,68);display:inline">Technical Sales Professional</div></span></font></div><div dir="ltr" style="font-size:12.8px"><span style="color:rgb(68,68,68);font-family:tahoma,sans-serif;font-size:small">NM EE98J Licensed Electrician</span><font color="#666666" face="Calibri"><span style="font-size:15px"><br></span></font><div><font color="#666666" face="Calibri"><span style="font-size:15px">510 S. Main St., Las Cruces, NM 88001</span></font></div><div><font color="#666666" face="Calibri"><span style="font-size:15px">cell 575.640.2432 | office 575.524.2030</span></font></div><div><font color="#3d85c6" face="Calibri"><span style="font-size:15px"><a href="mailto:Your.Email@PositiveEnergySolar.com" style="color:rgb(17,85,204)" target="_blank">mw@PositiveEnergySolar.com </a></span></font></div><div><font color="#3d85c6" face="Calibri"><span style="font-size:15px"><a href="http://www.positiveenergysolar.com/" style="color:rgb(17,85,204)" target="_blank">www.PositiveEnergySolar.com</a></span></font></div><div><font color="#3d85c6" face="Calibri"><br></font></div><div><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><div class="gmail_quote">On Fri, Aug 12, 2016 at 9:38 AM, Howie Michaelson <span dir="ltr"><<a href="mailto:howie@suncatchervt.com" target="_blank">howie@suncatchervt.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div>Mark, I read that section as stating that <u>both</u> must be true, which I would take to mean if one is using a 20 amp breaker to protect the output from a 3 kW inverter, you need to count it as 20 amps toward the 120% rule, not the 15.63 amps the 125% calculation would infer. I know that 2014 was changed to allow for larger breakers to feed hybrid inverters, but I can't recite the code that allows that (unless I am misreading the intent of the section you quoted). Can you clarify this for me?<br><br></div>Thanks,<br></div>Howie<span class=""><font color="#888888"><br></font></span><div><div><div><div class="gmail_extra"><span class=""><font color="#888888"><br clear="all"><div><div data-smartmail="gmail_signature"><div dir="ltr"><span style="color:rgb(120,63,4)"><b>Howie Michaelson</b></span><br><font size="1"><i>NABCEP Certified Solar PV Installer\u2122</i></font><br><span style="color:rgb(106,168,79)"></span>Sun Catcher, LLC<br><span style="color:rgb(68,68,68)"><span style="background-color:rgb(255,255,255)"><font size="2">Renewable Energy Systems Sales and Service<br>VT Solar Electric Incentive Partner</font><span></span></span></span><br><span style="color:rgb(180,95,6)"><a href="tel:802-272-0004" value="+18022720004" target="_blank">802-272-0004</a></span></div></div></div></font></span><div><div class="h5">
<br><div class="gmail_quote">On Fri, Aug 12, 2016 at 9:39 AM, Mark Westbrock <span dir="ltr"><<a href="mailto:westbrock@positiveenergysolar.com" target="_blank">westbrock@<wbr>positiveenergysolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:tahoma,sans-serif">Hi Mac,</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">The wording changed because in the 2011 NEC 705.12(D) you had to use the size of your backfeed breaker in calculating the busbar loading, but in 2014, 705.12(D)(2)(3)(b) now says "125 percent of the inverter output circuit current and the rating of the OCPD protecting the busbar shall not exceed 120%". </div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">So, the 2014 wording basically allows all inverters to follow the exception that used to be there for hybrid inverters. I hope that helps.</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">Cheers,</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">Mark</div></div><div class="gmail_extra"><br clear="all"><div><div data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font><font><font><font>----</font></font></font></font></div><div dir="ltr"><div><div dir="ltr" style="font-size:12.8px"><font face="Calibri"><span style="font-size:15px"><font color="#0076be">Mark Westbrock</font><font color="#666666">| VP, Branch Manager | Employee Owner</font></span></font></div><div dir="ltr" style="font-size:12.8px"><font color="#666666" face="Calibri"><span style="font-size:15px"><div style="font-family:tahoma,sans-serif;font-size:small;color:rgb(68,68,68);display:inline">NABCEP\u2122 Certified PV Installation Professional</div></span></font></div><div dir="ltr" style="font-size:12.8px"><span style="color:rgb(68,68,68);font-family:tahoma,sans-serif;font-size:small">NABCEP\u2122 Certified </span><font color="#666666" face="Calibri"><span style="font-size:15px"><div style="font-family:tahoma,sans-serif;font-size:small;color:rgb(68,68,68);display:inline">Technical Sales Professional</div></span></font></div><div dir="ltr" style="font-size:12.8px"><span style="color:rgb(68,68,68);font-family:tahoma,sans-serif;font-size:small">NM EE98J Licensed Electrician</span><font color="#666666" face="Calibri"><span style="font-size:15px"><br></span></font><div><font color="#666666" face="Calibri"><span style="font-size:15px">510 S. Main St., Las Cruces, NM 88001</span></font></div><div><font color="#666666" face="Calibri"><span style="font-size:15px">cell <a href="tel:575.640.2432" value="+15756402432" target="_blank">575.640.2432</a> | office <a href="tel:575.524.2030" value="+15755242030" target="_blank">575.524.2030</a></span></font></div><div><font color="#3d85c6" face="Calibri"><span style="font-size:15px"><a href="mailto:Your.Email@PositiveEnergySolar.com" style="color:rgb(17,85,204)" target="_blank">mw@PositiveEnergySolar.com </a></span></font></div><div><font color="#3d85c6" face="Calibri"><span style="font-size:15px"><a href="http://www.positiveenergysolar.com/" style="color:rgb(17,85,204)" target="_blank">www.PositiveEnergySolar.com</a></span></font></div><div><font color="#3d85c6" face="Calibri"><br></font></div><div><a href="http://www.positiveenergysolar.com" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/Positive-Energy-Solar-horizxs.png" alt=""></a><font color="#3d85c6" face="Calibri"><br></font></div></div></div><div><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Fri, Aug 12, 2016 at 7:26 AM, Mac Lewis <span dir="ltr"><<a href="mailto:maclewis1@gmail.com" target="_blank">maclewis1@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello wrenches,<div><br></div><div>I am looking for the exception to the 120% rule in the 2014 code that allowed for compliance to the 120% rule to be based on the utility-interactive current as opposed to the backfeed breaker size for hybrid inverter. I hope this still exists, but I'm having a hard time finding it in the 2014 code. In 2011 it was 705.12(D)2 Exception. That was nice clear language that all inspectors accepted, I'm hoping the same exists for the 2014 code.</div><div><br></div><div>Thanks in advance code experts</div><span><font color="#888888"><div><br></div><div><br clear="all"><div><br></div>-- <br><div data-smartmail="gmail_signature"><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:"Times New Roman";font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p></font></b></span></div>
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