PV and Fences [RE-wrenches]

[Joel Davidson]

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I may be wrong, but I think double-insulated pigtails will protect from 
shock the same way double-insulated tool cords and extension cords protect.

----- Original Message ----- 
From: "Mark Frye" <markf at berkeleysolar.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, April 15, 2008 2:59 PM
Subject: RE: PV and Fences [RE-wrenches]


>
> Joel,
>
> as i understand it, the double insulated in europe is part of an 
> ungrounded
> PV dc system. With an ungrounded pv dc the inverter can incorporate a much
> higher level of circuit control and personnel protection.  This is not
> afforded by the us standard grounded pv dc system. I guess i don't quite
> understand how the double-insulated pigtail helps you out of your
> predicament.
>
> Mark Frye
> Berkeley Solar Electric Systems
> 271 Vistamont Dr
> Grass Valley CA 95945
> (530) 401-8024
> www.berkeleysolar.com
>
> -----Original Message-----
> From: Joel Davidson [mailto:joel.davidson at sbcglobal.net]
> Sent: Tuesday, April 15, 2008 1:50 PM
> To: RE-wrenches at topica.com
> Subject: PV and Fences [RE-wrenches]
>
>
> It is proposed that 690.31 include adding fences or barriers around a PV
> array or installing wire mesh or other barrier to the mounting racks of 
> the
> modules to make the circuits not readily accessible. The reason for this
> proposal is that the great majority of modules produced today are
> constructed with pigtails and quick-connects and not conduit-ready 
> junction
> boxes. Rather than building more fences, doesn't it make sense to buy from
> manufacturers who make modules with j-boxes or change the Code to allow
> double-insulated pigtails without conduit as is done in Europe?
>
>
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> 


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