PV and New Residential Construction [RE-wrenches]

[Dan Rice]

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Peter,

If your jurisdiction has adopted the 2005 NEC, you can reference 690.31(E),
which covers PV DC circuits run inside of a building. See also 690.14(C)(1)
Exception. Prior to the '05 NEC there was no NEC provision for running these
circuits inside of a building beyond the first "readily accessible"
disconnect (though it was no-doubt done regularly). I agree with others'
suggestions that these raceways and enclosures be marked to indicate that
they enclose potentially live conductors.  Your building inspector, of
course, has the final say.

Dan Rice
Abundant Sun, LLC.

----- Original Message ----- 
From: "Peter Parrish" <peter.parrish at calsolareng.com>
To: <RE-wrenches at topica.com>
Sent: Monday, September 26, 2005 6:23 PM
Subject: PV and New Residential Construction [RE-wrenches]


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Wrenches



I am working with a home under construction and we plan to deploy about
3,360W-STC of PV modules on three separate roof spaces. The client wants the
PV DC runs to be routed in the same manner as the branch circuit wiring:
drilling studs, routing Romex, etc. Inverter will be mounted on an outside
wall.



It would seem that once indoors, I can assume dry conditions and an ambient
of 40 deg C or less.



The two questions I have are:



"Can I use NM cable with adequate protection (i.e. 1.25" of stud or
otherwise metal protection plates) as long as I observe the 1.56x ampacity
correction?"



"Assuming that the j-box where I switch from say USE-2 to NM cable must be
indoors, how accessible must it be? Attic space okay? And are attics in
southern California rated at 40 deg or less?

Peter T. Parrish
California Solar Engineering, Inc.




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