<div dir="auto"><div>Greg,</div><div dir="auto"><br></div><div dir="auto">It would seem that the 30A disco, if 100% rated, is fine with the max circuit current, and I'm sure it's fine with the voltage. The unfused disco is not going to be the limiting factor for your short circuit current. (The disco is probably 100kAIC.) Rather, the limiting factor would be the (40A / 10kAIC?) breaker. In other words, I don't see how 705.22(4) rules out the 30A disco.<br><br><div data-smartmail="gmail_signature" dir="auto">Blake Gleason, PE<br>Director of Innovation<br>& Technical Excellence<br>Sun Light & Power</div><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Wed, Aug 21, 2019, 9:52 PM Greg <<a href="mailto:greg@remotepowerinc.com">greg@remotepowerinc.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000099" bgcolor="#FFFFFF">
All, thanks for the responses. I greatly appreciate it. Yes the 30
amp disco is non-fusible and rated for full load. True, you have to
check the manu's specs. You <u>always</u> should check the
manufacturers specs. <br>
Anyway, 705.22(4) indicates the disco:<br>
<i>Have ratings sufficient for the maximum circuit current, </i><i><br>
</i><i>available short-circuit current, and voltage that is
available </i><i><br>
</i><i>at the terminals</i>.<br>
That rules out a 30 amp disco in this case. <br>
<br>
Best, <br>
Greg Egan<br>
Remote Power Inc.<br>
<br>
<div class="m_8257325804847795430moz-cite-prefix">On 8/21/2019 3:20 PM, Greg wrote:<br>
</div>
<blockquote type="cite">
All, the engineer came back with 705.22(4) to back up his
request. I think that's the end of it. Per code he is right but
since the inverter is only capable of 25 amps, the only time the
30 amp disco would see more than 30 amps is if the inverter was
shorted. If that's the case opening the 30 amp disco at that time
could cause failure. Pretty unlikely event. <br>
Although I think installing a 60 on this circuit is an
overabundance of caution but I'll be installing a 60 amp disco on
this one. <br>
<br>
Best, <br>
Greg Egan<br>
Remote Power Inc.<br>
<br>
</blockquote>
<br>
</div>
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