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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Hi Kelly and William,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Certainly NEC 250.64(E)(1) requires ferrous metal raceways containing a GEC to be bonded at each end. 250.97 requires us to assure that we maintain electrical continuity of raceways and metal sheaths to ground. As far as I can tell this includes both ends of the raceway. William, if you have a concentric knockout on one side I would think that you do have to use a bonding bushing for that side and then using a grounding locknut on the other side. At least that’s what our inspectors in San Francisco seem to think.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Kelly, do you have any code section you can point to which shows that bonding one side of the conduit is sufficient for circuits over 250 V to ground with a EGC?</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">Best,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a">August </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546a"> </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"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> 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>William Miller<br>
<b>Sent:</b> Monday, July 14, 2014 10:47 PM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> Re: [RE-wrenches] Concentrics at 250 volts plus</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Kelly:</span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Just as I suspected. I wish you could be here to share the lunch I have earned on my bet.</span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Thanks,</span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">William</span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> </span></p>
<div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><img width="64" height="28" id="Picture_x0020_1" src="cid:image001.jpg@01CF9FFC.EB4052F0" alt="Gradient Cap_mini"><br>
Lic 773985<br><a href="http://www.millersolar.com/">millersolar.com</a><br>805-438-5600</span></p></div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> </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"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> RE-wrenches [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Kelly Larson<br>
<b>Sent:</b> Monday, July 14, 2014 10:16 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Concentrics at 250 volts plus</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">Hi William,</p>
<div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">The requirement for bonding on BOTH ends comes when the wire though the conduit is a GEC. For EGC, just one end of the conduit is sufficient.</p><div><div><div>
<div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"><br>Blessings,</span></p>
</div><div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Kelly</span></p></div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"> </span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"> </span></p></div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">~~~~~</span></p>
</div><div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Kelly Larson</span></p></div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">707-223-3209</span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"> </span></p></div><div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Box 504<br>
Ukiah, CA 95482<br>Electrical Engineer</span></p></div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">NABCEP Certified Solar PV Installation Professional</span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">IREC Certified Master Trainer for Photovoltaic Installer<br>CA Electrical Contractor# 868189</span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"><a href="http://SolarKelly.com">SolarKelly.com</a></span></p></div></div></div></div></div>
</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Jul 14, 2014, at 3:11 PM, William Miller wrote:</p></div><p class="MsoNormal" style="margin-bottom:12.0pt">
</p><div><p class="MsoNormal" style="margin-bottom:12.0pt">Friends:<br><br>Please help us settle a crew debate before we come to blows: for circuits 250 volts and higher, do we need to bond EMT at both ends? Or, if there is bonded cabinet with a concentric on one end and a solid, bonded metal cabinet on the other, do we need a bonding bushing on the concentric end?<br>
<br>I say a conduit needs to be bonded only on one end. My misguided employee says both ends. Both cabinets are independently bonded.<br><br>Thanks in advance. <br><br>William<br>Miller Solar<br>_______________________________________________<br>
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