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The exception under 690.8(B)(1) definitely applies. All of Midnite'
breakers and boxes are rated for 100% continuous operation. I
believe, this does not apply to their touch safe fuse assemblies,
however. Also FYI, you should be able to use the 90 deg C rating
for complying with 110.14 (C) at least for the terminals in
Midnite's combiner. (This is according to my conversations with
Midnite)<br>
<br>
Also, it seems that you might be exceeding the max fuse rating of
the modules. You might want to check that. Why not have each
series string on its own 15 amp breaker?<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>
<div class="moz-cite-prefix">On 11/9/2016 6:57 PM, Jerry Shafer
wrote:<br>
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<div>Wrenches<br>
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We are getting some questions from
PRMD some questions relating to
690.8 here is what we have<br>
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3 modules, 260 watts at 9 amps ISC
each module is a single string which <br>
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goes into a MNPV6
disco/combiner/disconnect<br>
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combined to a 30 amp breaker, it is being
replaced with a 40 amp per 690.8(A) 1<br>
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leaves there and goes to a 32 amp disconnect
in our device.<br>
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here is where it gets interesting <br>
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690.8 (A) requires the 40 amp breaker but
reading down to 690.8 (B) 1 we <br>
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need to up-size to 50 amps (no 45 amp is non
available)<br>
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We also have added the 63 amp GFI in the disco<br>
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we have also moved up from # 10 wire to # 8 wire as a
result<br>
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All this seams over kill for three modules, there are 2
exceptions but PRMD do <br>
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not feel they are relative.<br>
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Is the Midnite solar disco considered an assembly with the
bus bars inside if we install the breakers<br>
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Any ideas would be helpful<br>
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Jerry<br>
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