[RE-wrenches] need for outdoor DC disconnect

[Ray]

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. Â  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 PVCÂ  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). Â 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 *
>
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