Are you required to meet the latest code? In many retrofit/ replacement
situations, you are only required to meet the code requirements of the
date the original system was installed. Metal vs PVC is dependent on
the code version you are meeting. Was metal a NEC 2008 requirement? I
don't have my old code versions here. When metal is required, its only
from the point of entry into the building to the inverter, so if you
mount the inverter outdoors, it doesn't have to change either. I've got
lots of legacy systems that have PVC on the inside, and never had an
issue. Seems like more trouble to change out than its worth, but if the
AHJ requires it, then yes.
Also, you didn't mention if the array was roof or ground mounted, which
would effect the 690.12 interpretation.
Ray Walters
Remote Solar
303 505-8760
On 6/12/19 12:49 PM, Kirk Herander wrote:
All,
I am retrofitting an existing PV system with Storedge / LG Chem /
optimizers and updating some code issues. I am replacing the PVC
conduit carrying the array conductors into the building with metallic
raceway to the point of DC disconnect(i.e. the inverter). The array
is presently connected to an Outback inverter / FM60 controller / AGM
batteries (grid tied with backup). If I am interpreting NEC 690.12
etc. correctly, a DC disconnect outdoors is generally not required
because of new rapid shutdown capability, amongst other reasons. Would
this be the case regardless of metal or plastic conduit penetrating
the building? The system at present has no outdoor DC disco, and to me
that’s a violation in addition to lack of metallic raceway entering
the building. Thanks.
*Kirk Herander*
*Owner|Principal, VT Solar, LLC *
*/Celebrating our 28^th Anniversary 1991-2019/*
*www.vermontsolarnow.com
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