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Thanks, Hans. <br>
<br>
The part about shorting the array was abandoned, I'm not sure but it
may be have been removed for the 1993 code. <br>
<br>
It's item two on this list that I've been trying to backtrack to. It is
pretty much the same as in the current code: "open the grounded
conductor". It is also not the way things are actually done. The GFP
fuse, circuit breaker, or PTC (Positive Temperature Coefficient) in
inverters and now in some charge controllers opens the system bond (As
described by John Wiles) not the grounded PV array conductor. Not
openning the PV array grounded conductor means that not only is the
normally grounded conductor in the PV array possibly energized (that
can't be avoided), but everything else it is attached to is possibly
energized. For battery based systems that includes: the battery
negative terminal, battery vent fan wiring, and all dc loads. The fact
that all dc loads may be energized to the potential of the PV array is
troubling. Especially with the possibility now of a 600-volt PV array
charging a battery system.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
<br>
<br>
Hans Frederickson wrote:
<blockquote
cite="mid:39AEE1DC1E2740A2A5C3D3A092765CA3@frederickson.local"
type="cite">
<title></title>
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<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">Kent,</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">I'm not a geezer yet, but thanks
to my dad I do have a copy of the 1987 NEC. 690-5 (Ground Fault
Detection and Interruption) was added in the 1990 NEC. There is
no 690-5 or mention of ground fault detection/interruption in the 1987
NEC.</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"></span> </div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">In the 1990 NEC, section 690-5
is very small compared to 690.5 in the 2011 NEC. Here's the complete
text from 1990:</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"></span> </div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">"690-5. Ground Fault Detection
and Interruption. Roof-mounted photovoltaic arrays located on
dwellings shall be provided with ground-fault protection to reduce fire
hazard. The ground-fault protection circuit shall be capable of
detecting a ground fault, interrupting the fault path, and disabling
the array."</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"></span> </div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">The handbook for 1990 goes on to
say that the gfp device must:</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">1) detect the ground fault</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">2) open the grounded conductor
to interrupt the ground fault</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">3) open the ungrounded
conductors and short the photoltaic array source to disable it</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"></span> </div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">For some reason, I've never
heard of item #3, specifically the part about shorting the array. Can
anyone shed light on this?</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"></span> </div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">Regards,</font></span></div>
<div dir="ltr" align="left"><span class="908360519-19072011"><font
color="#0000ff" face="Arial" size="2">-Hans</font></span></div>
<br>
<div class="OutlookMessageHeader" dir="ltr" align="left" lang="en-us">
<hr tabindex="-1"><font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Kent
Osterberg<br>
<b>Sent:</b> Monday, July 18, 2011 10:07 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:gary@icarussolarservices.com">gary@icarussolarservices.com</a>; RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] 1987 NEC<br>
</font><br>
</div>
Gary,<br>
<br>
No one else has come up with a 1987 NEC. If you can get a copy of 1987
section 690.5 (I think it was 690-5 back then), I'd appreciate it.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
<br>
Gary Willett wrote:
<blockquote cite="mid:4E20D179.7040506@icarussolarservices.com"
type="cite"><font size="+1">Kent:<br>
<br>
I am a member of the International Association of Electrical Inspectors
(IAEI), and they're headquartered here in the Dallas area.<br>
<br>
If you aren't successful getting the info from a Wrench with the 1987
code book, let me know and I am sure I can request a FAXed copy of 1987
section 690.5.<br>
<br>
</font>
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<p class="MsoNormal"
style="margin-bottom: 0pt; line-height: normal;"><span
style="font-size: 10pt;">Regards,<br>
<br>
Gary Willett, PE<br>
<a href="mailto:Gary@IcarusSolarServices.com" moz-do-not-send="true">Gary@IcarusSolarServices.com</a><O:P></O:P></span></p>
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</div>
<br>
On 7/15/2011 4:30 PM, Kent Osterberg wrote:
<blockquote cite="mid:4E20B16A.6030600@coveoregon.com" type="cite">I'm
looking for the text of 1987 NEC 690.5 to compare with 2011 version. If
any of you geezers have kept copies that old, please contact me off
list. Thanks. <br>
<br>
Kent Osterberg <br>
Blue Mountain Solar <br>
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