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<div class="moz-cite-prefix">Hi August;<br>
<br>
250.162(A) says "operating at greater than 50 v", which a 48 v
nominal system operates most of the time at over 50 v, at least
when solar charging and/or selling back.<br>
We used to get dinged many years ago for using breakers rated at
50v dc on 48 v systems. John Wiles used to insist we use the
highest possible voltage (Voc of modules on coldest day)<br>
Personally I prefer ungrounded systems, so I'm not saying there's
anything wrong from a safety stand point, just that inspectors
here don't see it the same way.<br>
<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 4/15/2013 2:20 PM, August Goers wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi
Drake,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The
Sunny Island System runs at 48 V nominal so I don't believe
250.162(A) applies. We have some really savvy inspectors in
the Bay Area and they were happy for us to be ungrounded
since we're operating at 48 V. Yes, the actual voltage might
go above 50 V when charging but I believe it is the nominal
voltage that the code cares about. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best,</span></p>
<br>
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