Illuminating Engineering Society (IES)
Founded in 1906, this is the technical authority on illumination. Provides guidelines relevant to electricians looking to ensure that their work is up to code.
National Association of Electrical Distributors (NAED)
A non-profit with a focus on bringing together the electrical industry, educate others, and contribute to valuable research. For electricians and electrical engineers, this site is a necessity.
National Center for Construction Education & Research (NCCER)
Under this association, member companies created a standardized training and credentialing program for the industry.
Western Electrical Contractors Association, Inc. (WECA)
Useful training and education programs to prospective electrical engineers, along with helping support the needs of those electrical contractors with their own businesses. Lots of content and high quality posts.