I am mounting a mirror in my hallway. I have plaster/lath walls and am planning on drilling a hole to insert a toggle bolt to hang the mirror on.
I marked the location and was ready to drill when I decided to use a non-contact voltage meter to see if any wires were in the area. It turns out there is wire going from a switch to an overhead light right though the area I'd like to drill my hole.
Obviously the first step is to flip the breaker, but I am not sure how I will know if I am damaging the wiring when I drill my hole. How do I drill the hole while knowing I'm maintaining the integrity of my electrical system?