Running anything with power other than in wall rated power wire romex in the wall is against code and will void your home owner s insurance iirc if a fire were to occur.
Running extension cord through wall.
Use clean good quality cables and you should not have anything to worry about.
If the extension cord is visible in both or either of the rooms consider tacking it to the wall and painting it to achieve a more finished look.
3 where run through doorways windows or similar openings.
Simply ensure the cables are in good condition before you run them through the wall.
Luckily there are code approved installation kits for running power up inside a wall that do not require and electrician.
Can the tv power cord or an extension cord be run inside the wall.
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Might be safe as can be but i wouldn t do it.
Feed the wires through the retro fit single gang box and then screw in the screws to secure them.
No cuts tears etc.
Running the conduit through the wall to an inside box is the most difficult step.
See our blog post why does running a power cord behind the wall for a wall mounted tv violate the electrical code.
It is against the national electrical code to connect extension cord wiring through a hole or opening in a wall inside a dropped ceiling or under flooring.
Don t even think about running ragged and torn wires.
Warning be mindful of any electrical wires water pipes gas pipes or any other important items running through your walls in the area you want to drill.
Even low voltage speaker wire that isn t in wall rated is a no no.
The 10 foot lengths of rmc are threaded on both ends and include a coupling on one end.
No not worth the risk.
It is perfectly safe to run most cables through a wall.