The National Electrical Manufacturers Association (NEMA) published NEMA LSD 64, “Lighting Controls Terminology.” NEMA LSD 64 defines terminology related to controls for lighting systems for nonresidential and residential applications. The goal of LSD 64 is for NEMA definitions to ultimately be used as the definitive reference for codes, standards, and legislation. This will eliminate the creation of new meanings for already defined terms, will minimize misapplication of controls terminology, and will eliminate the need for customized glossaries and terminology sections.

This document was developed by reviewing every known description for lighting control terminology, and represents ultimately agreeing upon best definitions. The working group reviewed definitions from documents such as American Society of Heating and Refrigerating and Air Conditioning Engineers standards, Illuminating Engineering Society of North America Handbook, NEMA guides, and all energy codes in use at the time, including California Title 24.

NEMA LSD 64-2012 is available at no charge.