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<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial>Hey Folks,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial>I don't want to dicourage anyone from doing good work that
meets or exceeds Code requirements. But I am a little quizzical about the
how we all seem to be ignoring what the Code actual says about
this.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial>"250.97 Bonding for Over 250V Volts....</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial>Exception: Where oversized, concentric, or eccentric knockouts
are not encountered....the following methods shall be permitted:...(3) Fittings
with shoulders that seat firmly against the box or cabinet, such as electrical
metallic tubing connectors..."</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009><FONT color=#0000ff
size=2 face=Arial>This tells me that if I run PV source conductors in EMT from
one metal box to another, I don't nessecarily need to bond the EMT as if it were
part of a service.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=140253322-09102009></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>Mark Frye</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>Berkeley Solar Electric Systems</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2 face=Arial>303 Redbud Way</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2 face=Arial>Nevada City, CA
95959</FONT></SPAN> <BR><SPAN lang=en-us><FONT size=2 face=Arial>(530)
401-8024</FONT></SPAN> <BR><SPAN lang=en-us></SPAN><A
href="http://www.berkeleysolar.com/"><SPAN lang=en-us><U><FONT color=#0000ff
size=2 face=Arial>www.berkeleysolar.com</FONT></U></SPAN></A><SPAN
lang=en-us><FONT size=2 face=Arial> </FONT></SPAN> </DIV>
<DIV> </DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>August
Goers<BR><B>Sent:</B> Friday, October 09, 2009 12:57 PM<BR><B>To:</B>
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] Rooftop wiring methods between
multiple subarrays<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">All
–<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">PVC
doesn’t hold up well in the Bay Area – Here’s a photo of some ~4 year old
PVC browned PVC from Marin County:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><IMG
id=Picture_x0020_0 alt="PVC (Small).jpg" src="cid:140253322@09102009-22FB"
width=341 height=150></SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">You
can see that the straps melted resulting in the conduit sliding down. Thank
goodness we didn’t install this. PCV seems like a good option for shaded areas.
<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">As
Bill pointed out, if we use EMT we need to bond both ends of the conduit to
comply with NEC 250.97. My issue is that it is hard to find outdoor rated
bonding bushings – that’s why we’ve just been installing cast metal boxes with
threaded connections (complies with NEC 250.92(B)(2)).<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">As
William point out, EMT is robust and reliable. I still think that there must be
more efficient way to go between arrays. Maybe that’s why commercial low profile
racking systems are often fully integrated systems with built in wire
raceways.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">-August<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">August
Goers<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Luminalt
Energy Corporation<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">O:
415.564.7652<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">M:
415.559.1525<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">F:
650.244.9167<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">august@luminalt.com<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>William
Miller<BR><B>Sent:</B> Friday, October 09, 2009 12:07 PM<BR><B>To:</B>
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] Rooftop wiring methods between
multiple subarrays<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Ray:<BR><BR>Good question. We do use PVC in coastal
zones to avoid corrosion. We try to keep it in the shade, paint it where
exposed to UV and support it in close intervals.<BR><BR>William<BR><BR><BR>At
10:57 AM 10/9/2009, you wrote:<BR><BR><o:p></o:p></P>
<P class=MsoNormal>Except for coastal installations.... where EMT is
NOT recommended outdoors, PVC browns out and warps, and we should
therefore use product X???<BR><BR>R. Walters<BR><A
href="mailto:ray@solarray.com">ray@solarray.com</A><BR>Solar
Engineer<BR><BR><BR><BR><BR>On Oct 9, 2009, at 11:38 AM, William Miller
wrote:<BR><BR><BR><o:p></o:p></P>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal>August:<BR><BR>I suggest the use
of EMT with proper fittings to protect high voltage, high amperage DC Wiring on
rooftops. Sure it is time consuming, but high quality, reliable
craftsmanship will always be thus.<BR><BR>William
Miller<BR><BR><BR><BR><o:p></o:p></P></DIV></BODY></HTML>