NEMA Publishes ANSI C136.41-2013

For Roadway and Area Lighting Equipment–Dimming Control Between an External Locking Type Photo-control and Ballast or Driver, describes methods of light level control between an external locking type photo-control (or similar device) and a dimmable ballast or driver for street and area lighting equipment. Mechanical, electrical, and marking requirements are established for dimming, and photo-controls.

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