2005 NEC? 210.52 Dwelling Unit Receptacle Outlets
(A) General Provisions
(1) Spacing Receptacles shall be installed so that no point measured horizontally along the floor line in any wall space is more than 1.8 m (6 ft) from a receptacle outlet.
Receptacles are required to be located so that no point in any wall space is more than 6 ft from a receptacle. This rule intends that an appliance or lamp with a flexible cord attached may be placed anywhere in the room near a wall and be within 6 ft of a receptacle, thus eliminating the need for extension cords. Although not an enforceable requirement, receptacles may be placed equal distances apart where there is no specific room layout for the general use of electrical equipment. Section 210.52(A)(1) does not prohibit a receptacle layout designed for intended utilization equipment or practical room use. For example, receptacles in a living room, family room, or den that are intended to serve home entertainment equipment or home office equipment may be placed in corners, may be grouped, or may be placed in a convenient location. Receptacles that are intended for window-type holiday lighting may be placed under windows. In any event, even if more receptacles than the minimum are installed in a room, no point in any wall space is permitted to be more than 6 ft from a receptacle.