The calculation of general-purpose branch circuits is determined by using a general unit load of 3 volt-amperes per square foot for one- and two-family dwelling units, which is derived from NEC Table 220.12.
As buildings are updated with high-efficiency LED light sources, energy codes generally require that the lighting control systems also be updated to satisfy new, more efficient performance requirements.
I have seen many display cases and commercial displays in retail stores made by millwork shops that incorporate lights and outlets, concealed power strips and power supplies, have multiple large flat screen displays, and a mixed bag of LED tape lights and drivers that are not Listed. Does UL list these types of display products as entire assemblies?
Lighting and energy codes are adopted for buildings by cities, states and other government bodies based upon standards written by technical experts that are listed by the American National Standards Association (ANSI) and then are enforced by the building departments of those municipalities.
ROSSLYN, Va., September 11, 2014—The National Electrical Manufacturers Association (NEMA) published NEMA LSD 64-2014 Lighting Controls Terminology. This white paper, which was originally published in 2012, was updated to clarify…