The National Electrical Manufacturers Association (NEMA) has published the 2014 edition of its Electrical Standards & Products Guide (ESPG), a comprehensive listing of NEMA electrical standards as well as an extensive directory of manufacturers and their products.
 
ESPG is used by military, government, and private buyers who work in lighting, motors and industrial controls, transmission and distribution, transportation, medical imaging, architecture and construction, and other industries that specify and use electrical equipment.
 
A complimentary copy may be downloaded at no charge.

NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Arlington, Virginia. Its 400-plus member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Total U.S. shipments for electroindustry products exceed $100 billion annually.