nunya supplied an acceptable solution above and somebody questioned charging $45.00 for 20.00 worth of materials...
Long story below.. as to what powerbridge had to go thorough to provide a code compliant solution... it ain't cheap to design and put new products into production and obtain a test house listing that AHJ can go along with.......
The fundamental application/design issue of power cords through conduit is most likely the same issue with fixed wiring through conduits, conduits on rooftops, and other variants is, that the temperature rating of the wiring insulation must not be exceeded..
The NEC code, being a prescriptive code, states what can and can not be done with listed materials..
For example wiring in conduit on the rooftops of commercial buildings for AC units, generators, etc, must be derated (maximum allowed current) in some installation configurations, given that the insulation will be exposed to external sources of heat beyond the heat generated by the resistance of the conductors themselves carrying the rated current.
You will find in the NEC code for a given gauge of wire, different current ratings based on the particular insulation material used in the construction of that wire..
Now to power cords in conduit.... Applying the above, cord such as SJT is UL listed for the various current ratings per gauge size, for installation in a free air environment, meaning that the heat generated when carrying the rated current will be dissipated and the overall cable/insulation will remain within it's rated temperature limit.. Put that same wire in a conduit or other enclosed environment, the heat can not dissipate as well and could exceed the rated limit of the particular insulation used under maximum current conditions and subsequent deterioration and failure.
However, given many flat screen wall installations, especially if a comprehensive ground bond plate and surge suppressor is also part of the installation (and too big to fit behind the TV itself), it almost mandates cord and plug installation or other fixed wiring solution to get from a ground bond plate/suppressor system to the TV. The desire to put the cabling in the wall for appearance sake is clearly here.. as illustrated by the numerous posts above..
It's no surprise that electrical codes / approved solutions to new problems tend to lag demands of new electronics/technology, but eventually catches up..
It would appear an acceptable solution is available as nunya pointed out, that is for a company recognizing the need and with sufficient engineering resources, to manufacture power cords/solutions using insulation materials and wiring gauge RATED for installation in wall AND go to the expense to get the products UL listed and approved for such applications.. e.g.
And there will be those who may say the current code does not cover that type of product and therefore not allowed.. but.. this situation comes up all the time e.g. with installation of UPS systems and other more complex systems.. and just not aware of how the situations are responsibly handled.
For that case, the manufacturer must as part of getting the equipment UL (or other accepted agency) approved, understand the limits of current codes for market jurisdictions and must provide explicit and exacting installation instructions (to be interpreted by the AHJ with the force of code) to approve such an installation.
This is the same scenario if you buy and install a wood stove these days, while building codes may address some requirements, the question will be is the product UL (or other acceptable agency) listed, and is the installation in accordance with the manufacturer's instructions?
Over time these "new ground" areas eventually work themselves into future NEC revisions.
I have not personally seen or used the above products, but hopefully in their design of the product, UL listing approval, and supplied documentation, they have a code compliant solution to the problem being discussed.
nunya, whizkid, does this seem a reasonably accurate summation of the problem and an acceptable solution?--
To be persuasive we must be believable; to be believable we must be credible; to be credible we must be truthful. -- Edward R. Murrow