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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks. One last thing: 690.47(C) has its
own set of grounding requirements (C)(1)-(8). So we need to follow those as
apposed to 250-166?</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- Peter</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> </span></font></p>
<br clear=ALL>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt'> </span></font></p>
<p class=MsoNormal><img width=67 height=80
src="cid:image002.gif@01C9F0CF.52A48520" align=left hspace=12><font size=1
color=navy><span style='font-size:9.0pt;color:navy'>Peter T. Parrish, Ph.D.,
President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a>
<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885
</span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt'> </span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>R. Walters<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, June 19, 2009 10:50
AM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] What is
a "direct-current system"?</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I just sort of hit this in a previous post: </span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>check 690.47C(3). Your system falls under (C) AC & DC grounding
requirements.....</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>This just shouldn't be that hard with the inspectors....</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<div><span style='border-spacing: 0px 0px;text-align:auto;-khtml-text-decorations-in-effect: none;
-apple-text-size-adjust: auto;orphans: 2;widows: 2;word-spacing:0px'>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:6.0pt;font-family:Helvetica;color:black'>R. Walters</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:6.0pt;font-family:Helvetica;color:black'>Solarray.com</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:6.0pt;font-family:Helvetica;color:black'>NABCEP # 04170442<span
class=apple-style-span> </span></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:6.0pt;font-family:Helvetica;color:black'> </span></font></p>
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<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:6.0pt;font-family:Helvetica;color:black'><br>
<br>
</span></font></p>
</div>
</span>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Jun 19, 2009, at 10:55 AM, Peter Parrish wrote:</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
</span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I have a LA Dept. of B&S inspector
cite Article 690.47(B) “Direct-Current Systems” and its consequent
grounding requirements (250.166(A)(B)) in connection with a very
straightforward grid tied PV system (i.e. no batteries, just PV and a Xantrex
GT inverter).</span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>He said that since there is a DC circuit
as well as an AC circuit, 690.47(B) applies. I countered that all PV systems
have a DC circuit, so to separately call out a “Direct-Current
System” must apply to something other than the DC PV circuit inherent in
all PV systems.</span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Am I missing something here? Is
“Direct-Current System” defined in Article 690? We are working off
NEC 2008.</span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks in advance for your help.</span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face="Times New Roman"><span style='font-size:10.0pt'>-</span></font><font
size=1><span style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Peter</span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><image003.gif></span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Peter T. Parrish, Ph.D.,
President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a>
<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885 </span></font><font size=1
color=navy><span style='font-size:9.0pt;color:navy'> </span></font></p>
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