Next question: Should a 3R rated box like the SolaDeck, or an Outback or
Midnite combiner box, or even a bell-type box be used on a rooftop that
normally has snow on it in the winter?
Here's the NEMA description for various enclosure
ratings:http://www.nema.org/Products/Documents/nema-enclosure-types.pdf
<http://www.nema.org/Products/Documents/nema-enclosure-types.pdf>
From NEMA's definitions there is little difference between a type 4 box
and 3R box. But the seal on a type 4 box prevents the entry of blowing
snow while a 3R box doesn't.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
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