<div dir="ltr"><div><div>I think I'm a bit confused on this point. I can't seem to find the code that specifically exempts the GEC requirement for inverters of ungrounded PV systems. The only exception I can find is only for AC PV modules (2014 NEC 690.47 (C) ). <br><br></div>I just looked in the installation manual for Solectria's new TL inverters and found this:<br>"Per NEC 690.47, a GEC must be installed, and the Grounding Electrode Terminal (GET) conductor must be sized in accordance with NEC article 250.166."<br><br></div><div>What am I missing?<br><br>Thanks,<br></div><div><div><div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr">Dana<br><br>Dana Brandt<br>Ecotech Energy Systems, LLC<br><a href="http://www.ecotechenergy.com" target="_blank">www.ecotechenergy.com</a><br><a href="mailto:dana@ecotechenergy.com" target="_blank">dana@ecotechenergy.com</a><br>360.318.7646</div></div></div>
<br><div class="gmail_quote">On Tue, Oct 28, 2014 at 11:30 AM, Rebekah Hren <span dir="ltr"><<a href="mailto:rebekah.hren@o2energies.com" target="_blank">rebekah.hren@o2energies.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">If you are on 2014:<div> 690.47(B) <br>
<div title="Page 637">
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<div>
<p><span style="font-size:10pt;font-family:Times">An ac equipment grounding system shall be permitted
</span></p>
</div>
</div>
<div>
<div>
<p><span style="font-size:10pt;font-family:Times">to be used for equipment grounding of inverters and other
</span></p>
</div>
</div>
<div>
<div>
<p><span style="font-size:10pt;font-family:Times">equipment <b>and for the ground-fault detection reference for
</b></span></p>
</div>
</div>
</div><div><span style="font-family:Times;font-size:10pt"><b>ungrounded PV systems.</b></span></div><div><br></div><div>and 690.47(C)(3) </div></div><div>
<div title="Page 637">
<div>
<div>
<p><span style="font-size:10pt;font-family:Times"><b>For ungrounded systems, this con</b></span><span style="font-family:Times;font-size:10pt"><b>ductor shall be sized in accordance with 250.122 </b>and shall</span></p></div></div>
<div>
<div>
<p><span style="font-size:10pt;font-family:Times">not be required to be larger than the largest ungrounded
</span></p>
</div>
</div>
<div>
<div>
<p><span style="font-size:10pt;font-family:Times">phase conductor. </span></p>
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</div>
</div></div></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Tue, Oct 28, 2014 at 2:22 PM, Gary Willett <span dir="ltr"><<a href="mailto:Gary@icarussolarservices.com" target="_blank">Gary@icarussolarservices.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">Kirk:<br>
<br>
A DC grounding electrode conductor (GEC) is not required for inverters that do NOT have a ground reference for the PV+ and PV- conductor(s) from the PV array.<br>
<br>
A GEC is not required if the string inverter is one of the new TL (transformerless) types. Also, this applies to micro-inverters such as the new Enphase M250 and later versions of the M215.<br>
<br>
Where this applies, only a properly sized equipment grounding conductor (EGC) is required.<br>
<br>
The EGC is sized according to [NEC 690.45] and can be a minimum of #14AWG when not exposed to damage, or #6AWG when exposed to potential damage.<br>
<br>
Regards,<br>
<br>
Gary Willett PE<br>
Icarus Engineering LLC<div><div><br>
<br>
On 10/28/14, 12:53 PM, Kirk wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hi,<br>
I'm on a jobsite without my code book. Could someone tell me where in the code ungrounded systems do not require the inverter GEC? Basically my onsite electrician doesn't believe me. Thanks.<br>
<br>
Kirk Herander<br>
VSE<br>
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