620 VDC [RE-wrenches]

[Drake Chamberlin]

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Thank you all for your input.  It appears that this is an area that 
needs work in the Code.  I'm looking forward to Bill's new 
temperature guidance being implemented.

With the particular system we are considering, we would be using 
Uni-Solar laminates that will adhere directly to a metal roof.  Is 
there anyway we can get credit for the building heat that will never 
let the modules get down to the ambient?

Drake


At 11:39 PM 6/26/2008, you wrote

>Joel,
>
>What does 600-Volts nominal mean to you? As Drake pointed out, 600Vac has a
>peak voltage of 850V. Any momentary exceeding of 600V, when using reasonable
>statistical design numbers, will be momentary at best and have no affect on
>the equipment unless the equipment is faulty to start with.
>
>Bill.
>
>-----Original Message-----
>From: Joel Davidson [mailto:joel.davidson at sbcglobal.net]
>Sent: Thursday, June 26, 2008 6:43 PM
>To: RE-wrenches at topica.com
>Subject: Re: 620 VDC [RE-wrenches]
>The NEC is very specific about 600 volts DC and AC in Chapter 1, paragraph
>2. The 600-volt Rule is that fundamental. Almost all AWJ and Code Priests
>interpret Article 690.7 "lowest expected ambient temperature" as the lowest
>temperature recorded by their chosen Weather Scribes even if that low
>temperature only happened once many years ago. From a practical standpoint,
>some solar modules can not be used optimally with some inverters. Every time
>
>I get a good module/inverter match, the manufacturers change specs,
>availability, price, or all three.
>
>----- Original Message -----
>From: "Drake Chamberlin" <Drake.Chamberlin at redwoodalliance.org>
>To: <RE-wrenches at topica.com>
>Sent: Thursday, June 26, 2008 12:37 PM
>Subject: 620 VDC [RE-wrenches]
>


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