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<div class="moz-cite-prefix">This seems like another well meaning
but slightly awkward code requirement. I think it would be
sufficient to list the nominal battery voltage (very important to
know) and then the actual variation in voltage is not going to be
too hard to comprehend.<br>
Knowing array Voc is also very important. If you think you have a
12 v based battery system, but the array is actually at 480 Voc,
you need to know that, before taking any covers off.<br>
<br>
Code requirements aside, I think we need to list:<br>
Array Voc<br>
Battery Nominal Voltage<br>
AC voltages<br>
<br>
That should be on the outside of every J box with connections
inside, so you know how to set your meter. If there's DC, and
you're testing for AC in a box, you might think power is off. My
handy voltage sniffer only senses AC for instance, so modern
battery based PV systems can get dangerous with high voltage DC
arrays, especially if you're trouble shooting a DIY system. I've
seen wires fed by three different sources, and gotten shocked
trying to remove the 2nd source. <br>
On code requirements like this, I move closer to the spirit of the
law, which is to keep everybody safe. The inspectors usually
agree, but you'll always have an AHJ that wants something
different.<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 6/11/2013 9:33 AM, jay peltz wrote:<br>
</div>
<blockquote cite="mid:279679BF-6E0B-419B-ACA2-DEA6A15C6EF1@asis.com"
type="cite">HI All,
<div><br>
</div>
<div>I mean as its worded, it would also be 240vac?</div>
<div><br>
</div>
<div>jay </div>
<div><br>
</div>
<div>peltz power</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div>
<div>On Jun 11, 2013, at 7:30 AM, <a moz-do-not-send="true"
href="mailto:Eric.Bentsen@schneider-electric.com">Eric.Bentsen@schneider-electric.com</a>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<br>
<font face="sans-serif" size="2">Hi Bob,</font>
<br>
<font face="sans-serif" size="2">I would rather it be worded
"maximum
normal operating voltage". </font>
<br>
<font face="sans-serif" size="2">Maximum operating voltage
would be the
recommended BULK voltage for the battery type being
utilized. </font>
<br>
<font face="sans-serif" size="2">Equalization is a
maintenance procedure,
which is why it calls for separate listing. </font>
<br>
<font face="sans-serif" size="2">It must also include
polarity of grounded
conductor.</font>
<br>
<br>
<font face="sans-serif" size="2">Eric<br>
</font><font size="3" color="#008000">_____________________________________________________________________________________</font><font
size="3">
<br>
</font><font face="Arial" size="1"><b><br>
Eric Bentsen</b> | </font><font face="Arial" size="1"
color="#008000"><b>
Schneider Electric </b></font><font face="Arial"
size="1"><b> | Solar
Business</b> | <b>UNITED STATES</b> | <b>Technical
Support
Representative</b> <b><br>
Phone:</b> +(650) 351-8237 ext. 001# | <b><br>
Email:</b> </font><a moz-do-not-send="true"
href="mailto:eric.bentsen@schneider-electric.com"><font
face="Arial" size="1" color="blue"><u>eric.bentsen@schneider-electric.com</u></font></a><font
face="Arial" size="1">
| <b>Site:</b></font><a moz-do-not-send="true"
href="http://www.schneider-electric.com/solar"
target="_blank"><font face="Arial" size="1" color="blue"><u>
www.schneider-electric.com/solar</u></font></a><font
face="Arial" size="1">
| <b>Address:</b> 250 South Vasco Rd., Livermore, CA
94551
<br>
</font><font face="Arial" size="1" color="blue"><u><br>
</u></font><a moz-do-not-send="true"
href="x-msg://179/www.schneider-electric.com/solar"><span><Mail
Attachment.jpeg></span></a><font face="Arial"
size="1" color="#00a000"><br>
*** Please consider the environment before printing this
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<br>
<br>
<br>
<table width="100%">
<tbody>
<tr valign="top">
<td><font face="sans-serif" size="1" color="#5f5f5f">From:</font>
</td>
<td><font face="sans-serif" size="1">"Bob Clark" <<a
moz-do-not-send="true"
href="mailto:bclark@solar-wind.us">bclark@solar-wind.us</a>></font>
</td>
</tr>
<tr valign="top">
<td><font face="sans-serif" size="1" color="#5f5f5f">To:</font>
</td>
<td><font face="sans-serif" size="1">"'RE-Wrenches'"
<<a moz-do-not-send="true"
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>></font>
</td>
</tr>
<tr valign="top">
<td><font face="sans-serif" size="1" color="#5f5f5f">Date:</font>
</td>
<td><font face="sans-serif" size="1">06/10/2013 08:08
PM</font>
</td>
</tr>
<tr valign="top">
<td><font face="sans-serif" size="1" color="#5f5f5f">Subject:</font>
</td>
<td><font face="sans-serif" size="1">[RE-wrenches] NEC
690.55 - "maximum
operating voltage"</font>
</td>
</tr>
<tr valign="top">
<td><font face="sans-serif" size="1" color="#5f5f5f">Sent
by:</font>
</td>
<td><font face="sans-serif" size="1"><a
moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a></font></td>
</tr>
</tbody>
</table>
<br>
<hr noshade="noshade">
<br>
<br>
<br>
<font face="Calibri" size="2">RE_Wrenches:</font>
<br>
<font face="Calibri" size="2"> </font>
<br>
<font face="Calibri" size="2">Can someone tell me what is
being referred
to in NEC 690.55 when it says “Photovoltaic power systems
employing energy
storage shall also be marked with the “maximum operating
voltage, . .
.” ?</font>
<br>
<font face="Calibri" size="2"> </font>
<br>
<font face="Calibri" size="2">We have an off-grid system
which employs
energy storage [i.e.; batteries]; so I need to know what
exactly is referred
to when this section mentions “maximum operating voltage”
so I can put
it on a sign.</font>
<br>
<font face="Calibri" size="2"> </font>
<br>
<font face="Papyrus" size="2" color="#e26200"><b>Bob Clark</b></font>
<br>
<font face="Papyrus" size="2" color="#e26200"><b><i>SolarWind
Energy Systems,
LLC</i></b></font></blockquote>
</div>
<br>
</div>
<br>
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