1978 NEC
210-25. Receptacle Outlets Required. Receptacle outlets shall be installed where specified in (a) through (d) below.
_____ A cord connector that is supported by a permanently connected cord pendant shall be considered a receptacle outlet.
_____ (a) General. Where flexible cords are used.
Exception. . . N/A
_____ (b) Dwelling Unit. In every kitchen, family room, dining room, breakfast room, living room, parlor, library, den, sun room, bedroom, recreation room, or similar rooms, receptacle outlets shall be installed so that no point along the floor line in any wall space is more than 6 feet, measured horizontally, from an outlet in that space, including any wall space 2 feet or more in width and the wall space occupied by sliding panels in exterior walls. The wall space afforded by fixed room dividers, such as free-standing bar-type counters, shall be included in the 6-floor measurement.
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_____ As used in this section a "wall space" shall be considered a wall unbroken along the floor line by doorways, fireplaces, and similar openings. Each wall space two or more feet wide shall be treated individually and permitted to include two or more walls of a room (around corners) where unbroken at the floor line.
_____ The purpose of this requirement is to minimize the use of cords across doorways, fireplaces, and similar openings. The small type is a '78 FPN, the following is not.
_____ The receptacle outlets required by this section shall be in addition to any receptacle that is part of any lighting fixture, or appliance, located within cabinets or cupboards, or located over 5? feet above the floor.
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