

Loose connections, under load, create heat, heat creates fire.

It is dangerous because if not spliced using proper wiring methods, it can be weak, loose. If that splice fails, it'll take a sledge hammer on your wall to fix the thing. The reason you don't ever want to bury a junction in the wall is because it is a splice - splices fail. If you don't mind the look of a blank cover on your wall, do as suggested before me. Doing it this way eliminates adding unsightly junction boxes, but is definitely the harder option.

The better option would be, turn off the circuit, get some 12/2 romex cable and firmly tape it to each of the existing cables and use the old cables as sort of a pull string to get the new cable to the existing locations, then junction where the original cables were junctioned. As far as I know, there is no approved method of splicing class I wiring inside of a wall, aside from that, it is both dangerous and begging for failure.Īs posted above, you can use junction boxes (he or she suggested using what is called a "nail on" or "new work" box, if the wall is no longer opened up to access the wall studs, use a "old work" or "cut in" box, this is a type of junction box that as little tabs connected to screws that when turned, flange out the tabs, mounting the box.)
