I asked a while back in this thread, but more specifically...
zman said his system was ground mounted and over 600V DC. What are the "complications" with over 600V DC, as long as it's outside and not attached to a building?
Obviously, everything underground is inaccessible.
This part after the italics from the 1000V DC link is saying (outdoor) DC combiners over 600V have to be kept locked?
And could someone confirm this? ->The over 600V DC ends at the inverter(s) DC input(s). Which code section is re: how far the 600v DC can go to an inverter which is inside an electrical shed? Is it 10 feet? Or 5 feet? And it must be metal conduit for that short indoor DC run?
Am I in the right neighborhood with the 10 (or 5) foot rule there?
Thanks.
SolarPro magazine-Apr/May 2013
Section 110.31, “Enclosure for Electrical Installations.” In
indoor installations, electrical equipment in systems above
600 V—inverters, combiners, switches and so on—must be
metal enclosed and marked with appropriate caution signs
if they are accessible to unqualified persons. Alternately,
the equipment can be rendered accessible only to qualified
persons by installing a lock or locating the equipment in
an access-controlled vault, room, closet or other walled or
fenced-in area. The upshot here is that inverters, combiners
or switches with nonmetallic enclosures may be subject to
different requirements than those with metallic enclosures.
While it stands to reason that components properly evaluated
and certified to UL 1741, whether in a metallic enclosure
or not, should have the same installation requirements,
an AHJ may interpret this differently.
In outdoor installations, electrical equipment behind
a locked fence, wall or screen is considered inaccessible to
unqualified persons. Per Table 110.31, a fence must have
10-foot clearance to live parts. Equipment that is accessible
to unqualified personnel, whether nonmetallic or metal enclosed,
must be designed “such that exposed nuts or bolts cannot be
readily removed.” If the enclosure has a door or hinged cover and is
mounted less than 8 feet above the ground level, it must be kept locked. Note that this section also
references Article 225, which in turn references Section 300.37
(both of which are discussed later in this article).
http://www.sma-america.com/fileadmi...gn/SolarProMagazine_1000VDC_AprilMay_2013.pdf