no safe modules for ground-mounted arrays[RE-wrenches]

Mark Frye markf at berkeleysolar.com
Mon Jan 21 10:59:57 PST 2008


Matt,

NEC 2008, 690.31 (A),

read it and weep.

MPF

-----Original Message-----
From: Matt Tritt [mailto:solarone at charter.net]
Sent: Monday, January 21, 2008 10:15 AM
To: RE-wrenches at topica.com
Subject: Re: no safe modules for ground-mounted arrays[RE-wrenches]




So now 48 volt circuits are considered dangerous as well? When did /this
/happen?

Matt

Mark Frye wrote:

>Matt,
>
>I am not sure about your reference to 48V, but the new Code applies to
>"circuits" operating at a max voltage above 30V.
>
>Only 12V and 24V nominal systems are exempted from the raceway requirement
>when readily accessible.
>
>MPF
>
>-----Original Message-----
>From: Matt Tritt [mailto:solarone at charter.net]
>Sent: Saturday, January 19, 2008 4:51 PM
>To: RE-wrenches at topica.com
>Subject: Re: no safe modules for ground-mounted arrays[RE-wrenches]
>
>
>
>Holy Smokes! According to this reg, and if applied to ground mounted PV,
>the mounting pole would need to be about 15' above grade. Has anyone
>else on this list noticed the level of absurdity possible when following
>a "logical" train of thought?  The biggest worries we used to have
>concerned keeping horses and bulls away from installations, and not
>falling from a roof, now it's technology proliferated to the point where
>hazards to humans is the worry because of the high voltages (or
>paranoia) involved.
>
>If accessible PV wiring is 48 volts or less, the problem goes away. Or,
>to blaspheme, maybe the US could join the rest of the world and use
>something other than the NEC to govern electrical practices. Please,
>anyone; how many of you, or anyone you know even remotely, has been
>injured or killed by any wire on the back of an array?
>
>If this all goes where it seems to be headed, the cost of PV could reach
>a point that puts it out of the reach of even more people, and the only
>companies able to accomplish installations will be the ones that can
>afford the hugely expensive insurance policies that will materialize to
>cover the "perceived" liabilities involved.
>
>Oh, for 1980!
>
>Matt T
>
>
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>

[Non-text portions of this message have been removed]


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