NEMA C136.28
NEMA C13628 2006-JUL-06 Roadway and Area Lghtng Equpment - Glass Lenses Used n Lumnares
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This standard covers flat and molded glass of soda-lime and borosilicate materials used as lenses for roadway and area lighting luminaires. This standard includes definitions, criteria, and test methods for mechanical and impact strength, thermal shock resistance, and temper for both materials.