NEMA published ANSI C136.41-2013 For Roadway and Area Lighting Equipment–Dimming Control Between an External Locking Type Photocontrol and Ballast or Driver. Standard describes methods of light level control between external locking type photocontrol (or similar device) and dimmable ballast or driver for street and area lighting equipment. Mechanical, electrical, and marking requirements are established for dimming, locking type photocontrols, and mating receptacles.
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