[RE-wrenches] 690.4 (B) ???

[William Miller]

Kirk:

When you say inverter combiner, I am confident you mean the device 
combining the AC output conductors of multiple inverters.

I got the same jive from an over zealous inspector once, but he and your 
inspector are just plain wrong.   Examine and show them the diagram in the 
code book of PV source and output conductors (690.2).  These are all DC PV 
conductors, not AC conductors, and, assuming the statement in the paragraph 
above is correct,  the passage has no application here.  This is a rookie 
inspector mistake.

Good luck,

William

PS:  By saying the source and output connectors are connected together, 
this is an oblique way of describing the PV combiner, the one point where 
PV source and output circuits are connected together.

WM



At 06:10 PM 4/9/2011, Kirk Herander, VSE wrote:
>2008 NEC states that:
>
>(B) Conductors of Different Systems. Photovoltaic
>source circuits and photovoltaic output circuits shall not be
>contained in the same raceway, cable tray, cable, outlet box,
>junction box, or similar fitting as feeders or branch circuits
>of other systems, unless the conductors of the different systems
>are separated by a partition or are connected together.
>
>Can anyone describe and give an example of what "connected together" means
>to inverter PV circuits in the same conduit as a branch (load) circuit?
>
>I have a single existing PVC conduit to a barn with an AC load subpanel. I
>want to run the output conductors of an inverter combiner panel in the barn
>through the same conduit to get to be main building. The fill / derating
>calcs work to do this. The inspector says I have to run a new conduit for
>the AC inverter combiner because the subpanel feeder and the combiner output
>conductors are "not connected". But they are both connected to the main
>building panel. Any insight will be appreciated. Thanks. I've also been told
>that the NEC 2011 comments on 690.4 (B) clarify this. Can anyone comment?
>Obviously I am not mixing DC and AC conductors.
>
>
>
>Kirk Herander

William Miller
Miller Solar
Voice :805-438-5600
email: william at millersolar.com
http://millersolar.com
License No. C-10-773985
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