busman
Senior Member
- Location
- Northern Virginia
- Occupation
- Master Electrician / Electrical Engineer
All,
We all know that 400.7 (reprinted below from 2014 NEC in case you don't have the book with you) gives us the permitted uses of Flexible Cords and Cables. What I don't get is the part in 400.8 that says, "Unless specifically permitted in 400.7, flexible cords and cables shall not be used for the following:" and lists 4 conditions (also below). It appears that nothing in 400.7 would override 400.8, so why say, " Unless specifically permitted in 400.7". Why not just say those uses are prohibited.
As an example, what condition in 400.7 would allow a cord thru a wall or ceiling?
I know this forum has some real word jockeys, so your opinions appreciated.
Thanks,
Mark
400.7 Us es Permitted
(A) Uses . Flexible cords and cables shall be used only for the
following:
(1) Pendants.
(2) Wiring of luminaires.
(3) Connection of portable luminaires, portable and mobile
signs, or appliances.
(4) Elevator cables.
(5) Wiring of cranes and hoists.
(6) Connection of utilization equipment to facilitate frequent
interchange.
(7) Prevention of the transmission of noise or vibration.
(8) Appliances where the fastening means and mechanical
connections are specifically designed to permit ready
removal for maintenance and repair, and the appliance is
intended or identified for flexible cord connection.
(9) Connection of moving parts.
(10) Where specifically permitted elsewhere in this Code.
(11) Between an existing receptacle outlet and an inlet, where
the inlet provides power to an additional single receptacle
outlet. The wiring interconnecting the inlet to the single
receptacle outlet shall be a Chapter 3 wiring method. The
inlet, receptacle outlet, and Chapter 3 wiring method,
including the flexible cord and fittings, shall be a listed
assembly specific for this application.
(B) Attachment Plug s. Where used as permitted in 400.7(A)(3),
(A)(6), and (A)(8), each flexible cord shall be equipped with an
attachment plug and shall be energized from a receptacle outlet
or cord connector body.
Exception: As permitted in 368.56.
400.8 Uses Not Permi tted
Unless specifically permitted in 400.7, flexible cords and cables
shall not be used for the following:
(1) As a substitute for the fixed wiring of a structure
(2) Where run through holes in walls, structural ceilings, suspended
ceilings, dropped ceilings, or floors
(3) Where run through doorways, windows, or similar openings
(4) Where attached to building surfaces
We all know that 400.7 (reprinted below from 2014 NEC in case you don't have the book with you) gives us the permitted uses of Flexible Cords and Cables. What I don't get is the part in 400.8 that says, "Unless specifically permitted in 400.7, flexible cords and cables shall not be used for the following:" and lists 4 conditions (also below). It appears that nothing in 400.7 would override 400.8, so why say, " Unless specifically permitted in 400.7". Why not just say those uses are prohibited.
As an example, what condition in 400.7 would allow a cord thru a wall or ceiling?
I know this forum has some real word jockeys, so your opinions appreciated.
Thanks,
Mark
400.7 Us es Permitted
(A) Uses . Flexible cords and cables shall be used only for the
following:
(1) Pendants.
(2) Wiring of luminaires.
(3) Connection of portable luminaires, portable and mobile
signs, or appliances.
(4) Elevator cables.
(5) Wiring of cranes and hoists.
(6) Connection of utilization equipment to facilitate frequent
interchange.
(7) Prevention of the transmission of noise or vibration.
(8) Appliances where the fastening means and mechanical
connections are specifically designed to permit ready
removal for maintenance and repair, and the appliance is
intended or identified for flexible cord connection.
(9) Connection of moving parts.
(10) Where specifically permitted elsewhere in this Code.
(11) Between an existing receptacle outlet and an inlet, where
the inlet provides power to an additional single receptacle
outlet. The wiring interconnecting the inlet to the single
receptacle outlet shall be a Chapter 3 wiring method. The
inlet, receptacle outlet, and Chapter 3 wiring method,
including the flexible cord and fittings, shall be a listed
assembly specific for this application.
(B) Attachment Plug s. Where used as permitted in 400.7(A)(3),
(A)(6), and (A)(8), each flexible cord shall be equipped with an
attachment plug and shall be energized from a receptacle outlet
or cord connector body.
Exception: As permitted in 368.56.
400.8 Uses Not Permi tted
Unless specifically permitted in 400.7, flexible cords and cables
shall not be used for the following:
(1) As a substitute for the fixed wiring of a structure
(2) Where run through holes in walls, structural ceilings, suspended
ceilings, dropped ceilings, or floors
(3) Where run through doorways, windows, or similar openings
(4) Where attached to building surfaces
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