National Electrical Code
The 2011 edition of NFPA 70 National Electrical Code is the current standard for the construction and use of electrical systems. To read the document scope, click here.
This link provides online access to the National Electrical Code (read only). It requires registration and it does not allow copying or printing.
Online access to the latest (2009) edition of NFPA 70E Standard for Electrical Safety in the Workplace. It covers electrical safety requirements for employee workplaces that are necessary for the practical safeguarding of employees in their pursuit of gainful employment, including the installation of electric conductors, electric equipment, signaling and communications conductors and equipment, and raceways.
The National Electrical Code Handbook from NFPA is written to enhance your understanding of the NEC.