IHS Markit is your source for NEMA standards and publications.
NEMA is the trade association of choice for the electrical manufacturing industry. Founded in 1926 and headquartered near Washington, D.C., its approximately 450 member companies manufacture products used in the generation, transmission and distribution, control, and end-use of electricity. These products are used in utility, medical imaging, industrial, commercial, institutional, and residential applications.
IHS Markit carries all NEMA standards dealing with rating, testing performance, manufacture, and applications of a wide range of electrical equipment: controls for electric water heaters; oil burner controls; electric baseboard heaters; conduit and cable; high voltage insulators; industrial storage bateries; high-voltage fuses; power switch gear assemblies; electrical connectors; washer head bolts and nuts; plastic tree guards; guide to pin and sleeve plugs, receptables, and connectors; smoke detectors; coaxial communication cable; X-ray tubes; and installation procedures.