The National Electrical Manufacturers Association (NEMA) published NEMA SSL 7A-2015 Phase-Cut Dimming for Solid State Lighting—Basic Compatibility. This standard provides compatibility requirements when a forward phase-cut dimmer is combined with one or more dimmable light-emitting diode (LED) light engines (LLEs). An LLE, for the purposes of this document, comprises one or more LED modules, LED control gear (integral or remote), and a connection to the mains circuit.
Originally developed in 2013 by the NEMA Lighting Controls Committee, this revision eliminates the category differentiation of Type 1 and Type 2 dimmers. It also clarifies test condition language.
NEMA SSL 7A-2015 may be purchased in hard copy or downloaded for $60 on the NEMA website here.