Historical
NEMA ANSI C136.28:2006
For roadway and area lighting equipment - glass lenses used in luminaires
Covers flat and molded glass of soda-lime and borosilicate materials used as lenses for roadway and area lighting luminaires. Includes definitions, criteria and test methods for mechanical and impact strength, thermal shock resistance and temper for both materials.
NEMA: National Electrical Manufacturers Association [nema]