On Mon, 10 Apr 2017 14:08:08 -0400, wrote:

On Mon, 10 Apr 2017 12:10:49 -0400, wrote:



OK
(1) Cables installed in vertical runs and penetrating more than
one floor, or cables installed in vertical runs in a shaft, shall be
Type CL2R or CL3R

Does not apply - only going through one floor, therefo

Floor penetrations requiring Type CL2R or CL3R
shall contain only cables suitable for riser or plenum use. Listed
riser signaling raceways and listed plenum signaling raceways shall be
permitted to be installed in vertical riser runs in a shaft from floor
to floor. Only Type CL2R, CL3R, CL2P, or CL3P cables shall be
permitted to be installed in these raceways.

Also does not apply.


Yes, I agree.


The installation requirements for the low-voltage wiring of
information technology equipment (electronic data processing and
computer equipment) located within the confines of a room that is
constructed according to the requirements of NFPA 75, Standard for the
Protection of Information Technology Equipment, are not covered by
Article 725. Low-voltage wiring within these specially constructed
rooms is covered in Article 645.

The requirements of 645 are stricter than 725 under a raised floor
since this is usually an air handling space. "DP" cable is plenum
rated. Once inspectors discovered computer rooms, lots of things
changed. IBM had to replace thousands of miles of riser rated
interface cables.
Of course, I doubt there are that many computer rooms these days.


Also, if listed computer equipment is interconnected and all the
interconnected equipment is in close proximity, the wiring is
considered an integral part of the equipment and therefore not subject
to the requirements of Article 725. If the wiring leaves the group of
equipment to connect to other devices in the same room or elsewhere in
the building, the wiring is considered ‘‘wiring within buildings’’ and
is subject to the requirements of Article 725.





Note the first sentance of the second paragraph.If the wiring is "an
integral part of the equipment" it is " therefore not subject to the
requirements of Article 725"

I still maintain the NEC does not address the situation as described
above.

How can that be true? By your own definition
"If the wiring leaves the group of
equipment to connect to other devices in the same room or elsewhere in
the building, the wiring is considered ‘‘wiring within buildings’’ and
is subject to the requirements of Article 725"
EXCEPT when the cabling is part of a "listed device" - which the cord
on the wall-wart is - when it is not addressed.