NEMA C136.24
NEMA C13624 2004-JAN-01 For Roadway and Area Lghtng Equpment Nonlockng Button Type Photocontrols
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This standard covers the electrical and mechanical interchangeability of nonlocking type photocontrols for mounting within a roadway or off-roadway luminaire, herein called "controls." These controls are commonly called "button" photocontrols