An imaginary horizontal surface situated at the nominal working height in an interior space
(n) Often called a construction plane, a 2-D infinitely large plane that can be oriented anywhere in 3-D space A workplane usually has an associated local coordinate system designated with unique letters (e g , U, V, W) Workplanes are used to define 2-D geometry used in the development of 3-D models
The plane at which work is usually performed and on which illuminance is calculated and specified; generally assumed to be a horizontal plane at desk height (0 76 meters [30 inches])