working plane

reference surface defined as the plane at which work is usually done

Equivalent term: "work plane", "utilization plane"

NOTE In interior lighting and unless otherwise indicated, this plane is assumed to be a horizontal plane 0,85 m above the floor and limited by the walls of the room. In the US the working plane is usually assumed to be 0,76 m above the floor, in Russia 0,8 m above the floor.

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