NEC with regard to PV systems.
http://www.dcpower-systems.com/data/NEC_and_PV.pdf
John Wiles, the author, has an updated version dealing with the 2005 NEC. Download from...
http://www.nmsu.edu/~tdi/pdf-resources/PV=NEC_V_1.4-Dec06.pdf
This is purportedly a summary of the Wiles document...
http://www.coseia.org/PhotovoltaicsOutline-TroyWanek.pdf
And lastly, Wiles' Code Corner articles from Home Power magazine can be found here...
http://www.nmsu.edu/~tdi/Photovoltaics/Codes-Stds/codecorner.html
Thanks guys. That's so much reading it boggles the mind; mine at least.
Hmmmm.... does this duct tape on this black wire mean it's pos, or is it neg??? :P :o
Seriousy tho' the Home Power articles have some good PV info, and the code... well it's code.