It's perfectly safe to pass most cables through a wall! Actually, the only cable you shouldn't pass through a wall is a standard power cable that connects to a socket. These cables heat more than many other cables.

Do not connect any more power lines to increase the number of plugs available. However, you can temporarily connect an extension cable to an energy line. If you use power lines or extension cables in various places in your home, consider renting an electrician to install multiple sockets.

It is easy to exceed the power band and circuit capacity, so be careful when adding more devices to the power band. Do not use adapters or extension cables between the power band and the output. Never connect a power band in a second power band or extension cables.

5 Answers. You can connect them in series to add voltages, but the resulting current capacity will be the lowest of the two current speeds. No, you cannot add two sources in any way to add your current and voltage rating. This should only be clean of output power.

Because it is connected to the electrical system, an extension cable can be connected to it. This is the only time that it is acceptable to connect an extension cable to a power supply line. Extension cables are only for temporary use and should not be left connected in the wall sockets when they are not used actively.