[RE-wrenches] Rooftop DC disconnects

[Darryl Thayer]

I like the idea for larger systems, someone tell Sq. D to make a 4 blade 600 volt disconnect.  I would like to see it disconnect the "fuse grounded" conductor also. and then it could be a combiner and load rated disconnect.   
darryl

--- On Tue, 9/22/09, Chris Anderson <CAnderson at borregosolar.com> wrote:

> From: Chris Anderson <CAnderson at borregosolar.com>
> Subject: Re: [RE-wrenches] Rooftop DC disconnects
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Tuesday, September 22, 2009, 10:55 AM
> I am pretty sure it is in the draft
> of the 2011 code. While we are not governed yet by the 2011
> code, I think it is good practice and is something we should
> all do sooner than later. Borrego is moving that direction
> as we speak. No reason to wait around for the code to tell
> us what we have to do. I would recommend getting an
> integrated load break combiner - there are several on the
> market already - and breaking the output circuits from the
> combiner immediately so that conduits running on the roof
> and through the building can be de-energized in the event of
> a fire.
> 
> -Chris Anderson
>   Chief Technology Officer
>   Resources Group 
>   C: 603-732-2411
>   Borrego Solar Systems
> 
> 
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org]
> On Behalf Of Troy Harvey
> Sent: Tuesday, September 22, 2009 11:43 AM
> To: RE-wrenches
> Subject: [RE-wrenches] Rooftop DC disconnects
> 
> I am being told we need rooftop DC disconnects for a 6
> string  
> commercial solar install, instead of DC disconnects in the
> mech room.  
> I don't see anything about this in the NEC. Any truth to
> this?
> 
> 
> thanks
> 
> Troy Harvey
> ---------------------
> Heliocentric
> 801-453-9434
> taharvey at heliocentric.org
> 
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