Code Q&A: Flexible Cord and Cable Limitations
Q. What uses of flexible cords and flexible cables are not permitted by the NEC?
See the answer below.
A. Unless specifically permitted in Sec. 400.10, flexible cord sets (extension cords) and power‑supply cords aren’t permitted [Sec. 400.12]:
(1) as a substitute for the fixed wiring of a structure.
(2) to be run through holes in walls, structural ceilings, suspended or dropped ceilings, or floors.
(3) to be run through doorways, windows, or similar openings.
(4) to be attached to building surfaces.
(5) to be concealed by walls, floors, or ceilings, or located above suspended or dropped ceilings. Exception: Flexible cords can be located above suspended or dropped ceilings if installed in a metal enclosure in accordance with Sec. 300.22(C)(3).
(6) to be installed in raceways, except as permitted by Sec. 400.17 for industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons will service the installation.
(7) where subject to physical damage. Note: Even cords listed as “extra‑hard usage” must not be used where subject to physical damage.
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