NEC over 600 Volts [RE-wrenches]

[Bill Brooks]

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Joel,

I guess we misunderstood the question. You need to get a lot more specific
about what you are asking. If you are asking about when the Over 600V
addition was made to 690, that was 1999. It is somewhat irrelevant when
Article 100 started dealing with systems over 600V. It's been a long time.

Your question about PV systems over 600V in the U.S. needs to be more
accurately posed. There are many bipolar PV systems throughout the U.S. that
are well over 600Vdc. I believe the Solec systems you were involved with
were over 600Vdc. However, I am unaware of any system over 600Vdc that has
been inspected using the provision in 690. In order to do this, you must use
listed modules for 1000Vdc (I'm not sure anyone sells them anymore--for
several years ASE-100 was the only module rated at 1000V), you have to use
wire rated for at least 1000V, and use disconnects (expensive) and fuses
(not aware of any) rated for 1000V. So why do you want to know?

Bill.
 

-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net] 
Sent: Tuesday, May 30, 2006 8:10 PM
To: RE-wrenches at topica.com
Subject: Re: NEC over 600 Volts [RE-wrenches]


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Bill,

Thank you. Sandia also said 1999 in 
http://www.fsec.ucf.edu/pvt/Resources/publications/pdf/FSEC-PV-OS-15-1999-1.
pdf#search='when%20NEC%20Table%20690.7' 
The NFPA librarian replied, "It first appeared as section B in the 1975 
edition, though you can't tell by looking at the Table of Contents."

Has anyone on this list designed and installed an over 600-volt PV system in

the U.S.?

Joel Davidson

----- Original Message ----- 
From: "Bill Brooks" <bill at brooksolar.com>
To: <RE-wrenches at topica.com>
Sent: Sunday, May 28, 2006 6:25 PM
Subject: RE: NEC over 600 Volts [RE-wrenches]


Joel,

It went into the 1999 NEC for the first time.

Bill.

-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net]
Sent: Saturday, May 27, 2006 3:49 PM
To: RE-wrenches at topica.com
Subject: NEC over 600 Volts [RE-wrenches]

Can someone please tell me in what edition of the NEC that "Article 100, II 
Over 600 Volts, Nominal" or the separate definition for over 600 volts was
added to the Code? Thank you in advance.

Joel Davidson


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