Most recent
ANSI C136.9-2003 (R2018)
Roadway and Area Lighting Equipment - Socket Support Assemblies for Metal Heads - Mechanical Interchangeability
Covers the following equipment for use in metal heads that are in accordance with the latest revision of C136.6: high-intensity discharge lamp ballast and socket assemblies, and mogul and medium multiple incandescent lamp socket and support assemblies.
NEMA: National Electrical Manufacturers Association [nema]