<div dir="ltr">The conductors have to be rated for 200A as normal. Fault current can only come from the grid. <div>While the total available current on the bus of a panel is the total of the source breakers, in the conductors, grid and solar power cancel out and the total is not the sum of the two.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Mar 4, 2014 at 1:05 PM, Kirk Herander <span dir="ltr"><<a href="mailto:kirk@vtsolar.com" target="_blank">kirk@vtsolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:14.0pt">Hello,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">I have a 225 amp 3-phase main lug sub-panel protected by a 200 amp breaker. My inverter breaker feeding the sub panel is 60 amps. So 225 a bus x 1.2 = 270 amps. That’s less than the sum of the two breakers of 260 amps, so no issue there. The conductors between sub and main panel have to be rated for at least 260/1.2 = 217 amps, correct? Is this 217 amps before or after derating the conductor?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt">Kirk Herander<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">VT Solar, LLC<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt">dba Vermont Solar Engineering<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt">NABCEP<sup>TM </sup>Certified Inaugural Certificant<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">NYSERDA-eligible Installer<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt">VT RE Incentive Program Partner<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:14.0pt"><a href="tel:802.863.1202" value="+18028631202" target="_blank">802.863.1202</a><u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p></div></div><br>_______________________________________________<br>
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