Is it possible to run the TV's power wire or an extension cord inside the wall? No, the danger isn't worth it. The National Electrical Code prohibits connecting extension cable wiring through a hole or aperture in a wall, inside a dropped ceiling, or beneath flooring. These areas were not designed to carry electrical current and could cause damage if you were to have a fire or other incident on these surfaces.
If you must run your power line within the wall, use a dedicated conductor or replace the wall with one that is constructed for electrical purposes only. This will help prevent any possible exposure to electrical current.
TVs are very heavy, so running your power line inside the wall is not recommended. If you have to do this, make sure the cable is thick enough to support the weight of the television.
Your best option is to either mount the television above-ground or install a wall-mount. This will allow you to run the cable out of the wall first before mounting the television.
It is safe to connect a television to an extension cable. Extension cables are only harmful when they are overloaded by being used to power big equipment such as refrigerators. If the extension cord is already powering other heavy-duty appliances, a television set will overload it. But a regular household television should not cause any problems if it is connected to an extension cord.
In fact, using an extension cord to power a television is better for the environment because it prevents people from having to buy multiple sets of wiring just to have enough power for various accessories. Also, this type of setup is more secure than running everything off a single circuit because if something happens to the main line, then at least some of the devices on the extension won't be affected by the outage.
Here are some things to remember when using extension cords:
1. Don't use extension cords for permanent wiring. They should be used only for temporary repairs and then replaced with proper wiring. Damage can occur if a cord is overloaded long term or not maintained properly. A few minutes of burning time may not seem like much, but extended exposure to heat or electricity can cause damage to wires inside an extension cord or your home's wiring system overall.
2. Make sure that all ends of extension cords are covered.
Due to National Electrical Code regulations, including the prohibition on the use of flexible cords and cables, extension cords, even heavy-duty varieties, are not designed or manufactured for use within a wall or ceiling. Installing an extension cord within a wall is like running a wire directly into the wall—it's not done.
If you need to extend a circuit beyond your exterior wall surface, such as if you want to connect two rooms together with a shared electrical outlet, there are several options available for doing so. The most affordable option is to simply use a junction box to split off a portion of the circuit. This can be done by either removing part of the existing wall surface or adding a new hole for a metal box. If you choose this method, make sure that you follow code requirements regarding the location of ground wires in relation to live circuits.
If you want to avoid having to reroute any circuits through a breaker panel or other distribution center, a dedicated outdoor extension cord is your best option. These types of cords are approved by the NEC for use within walls and should be capable of handling any current that will be carried by it. They usually consist of three conductors: one black, one white, and one green or red. The black conductor is always made up of four strands of wire because it will be connected to a terminal block or connector inside the wall.
This intermediate-level project will show you how to connect an electrical wire inside your wall, extending the circuit of your existing outlet to a new one just behind your television. It's cheap, quick, and will give your TV a clean, professional appearance. You'll need: A 3-wire cable (red, white, and black) with each wire measuring 12 inches long. An electrician's tape tool for marking wires. Wire cutters. Screw-on connector blocks for connecting cables of different sizes. Crimps if using screw-on connectors instead of glue.
Your local electrical code should have more detailed information about what types of connections are allowed in a wall outlet, but generally speaking, it's fine to use any of the wire colors as the "hot" side of the connection. If you're not sure which is which, assume that red is hot. Also assume that black is always neutral and white is always safe.
To start, measure from the back of the television to the center of the outlet cover. This is the location where you'll be inserting the wiring extension cord. Make sure you leave enough space between the end of the extension cord and the face of the outlet box for ventilation. Then follow the cable route shown in the picture below.
You can now take off the outlet cover and inspect the wiring inside the wall.