The 2017 NEC Code Compliance states that flexible power cords hidden behind a wall are a violation of the National Electric Code and could void your home insurance coverage.
Multimedia Tech only performs TV mounting, home theater installation, or all of the other home and business installation services following building and national electric codes.
The following is an excerpt from (NEC) – NFPA 70
400.8 Uses Not Permitted. Unless specifically permitted in 400.7, flexible cords and cables shall not be used for the following:
In plain and simple to understand words, it explains how running power cords through the walls is not a substitute or suitable instead of permanent wiring.
A new electric outlet installed directly behind the TV is what is required.
Power cables are not rated for in-wall use, can’t handle heat requirements and installing them inside the wall is simply ILLEGAL.
Additionally, the insurance company will be happy to void covering a home should a fire result.
IF any type of professional installer or installation company advice it is fine to run power cords inside the wall then those unexperienced professionals may not be aware of the (NEC) National Electric Code requirements or are definitely more concerned about shortcuts than personal safety of those who they call clients.