The National Electrical Manufacturers Association (NEMA) has published a guide that includes NEMA standards, white papers, product categories, and member manufacturers.
The "2019 Electrical Standards and Products Guide" includes standards and technical papers that address products from manufacturers across 56 sectors in multiple industry segments. The guide offers information on product compatibility, performance, safety, and energy efficiency, as well as sales contact information by product type for hundreds of electrical manufacturers.
NEMA standards are used by military, government, and private buyers who work in medical imaging and other industries that specify and use electrical equipment.