Engineer wants to see #6 above grade (fine), but #2 direct buried between ground rods (seems excessive).<div><br clear="all">Phil Schneider<br>Creative Energies<br><br>
<br><br><div class="gmail_quote">On Wed, May 5, 2010 at 10:44 PM, August Goers <span dir="ltr"><<a href="mailto:august@luminalt.com">august@luminalt.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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<div>Phil,</div>
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<div><font size="2" face="tahoma">The inspector wants to see #2 tinned copper for equipment ground in exposed areas? Or is he referring to the grounding electrode conductor? This kind of stuff gets mixed up all the time in my neck of the woods...</font></div>
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<div><font size="2" face="tahoma">-August</font></div>
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<div><font size="2" face="Tahoma">August Goers</font></div>
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<div><font size="2" face="tahoma">Luminalt Energy Corporation</font></div>
<div><font size="2" face="tahoma">O: 415.564.7652</font></div>
<div><font size="2" face="tahoma">M: 415.559.1525</font></div>
<div><font size="2" face="tahoma">F: 650.244.9167</font></div>
<div><font size="2" face="tahoma"><a href="http://www.luminalt.com/" target="_blank">www.luminalt.com</a></font></div>
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<font color="#000000" size="2" face="Tahoma"><b>From:</b> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] On Behalf Of Phil Schneider [<a href="mailto:phil@creativeenergies.biz" target="_blank">phil@creativeenergies.biz</a>]<div class="im">
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<b>Sent:</b> Wednesday, May 05, 2010 8:24 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] bare tinned solid copper<br>
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<div>Wrenches,
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<div>We are working through submittal steps for a 75 kW ground mounted array. The array is split into 8 subarrays. There is a combiner or junction box at each subarray, with a ground rod spec'd at each subarray, underneath the "box station", with a bare stranded
#6 from an equipment grounding bus to the rod, and equipment grounding conductors through conduit between a ground bus in each box. 15A fuses in combiners, and 100A fuses at inverter.</div>
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<div>The engineer we're working with to stamp the plans wants to see bare, tinned, solid copper anywhere this equipment ground is in the elements, and wants to see #2 (!) bare, tinned, solid copper cadwelded and direct-buried between all 8 rods and back to
the existing AC grounding electrode system. He says this is the standard (from telecom, I'm afraid) to ensure that all the rods are at the same potential. No Code reference, and I don't see anything in article 250 along these lines. Hard to convince him
that #6, untinned, across the board is adequate.</div>
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<div>In the end, we'll probably go ahead and do it because it is relatively low cost and we want a good relationship here, but I'm wondering if anybody else out there is using bare tinned copper in this type of application, and I'd like more info on this to
make a better argument next time.</div>
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<div>Phil</div>
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<div>Phil Schneider<br>
Creative Energies<br>
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