Readings from the 2008 NEC Handbook
NEC is the National Electric Code and is published by the National Fire Protection Accociation.
Article 690 is for Solar Photovoltaic Systems.
Readings from the NABCEP Study Guide for Photovoltaic System Installers Version 4.2-April 2009
NABCEP is the North American Board of Certified Energy Practitioners.
These readings should be helpful when studing for the NABCEP PV Installers Exam or for other PV studies.
