With reference to possibly encountering nails comment from above
Two adjacent rooms with a shared upper corner by the ceiling specifies a T wall layout as shown here:
When you go to drill a hole in the very upper corner of the room you will be drilling through the upper top plate (and possibly into a part of the lower top plate depending upon the thickness of the ceiling drywall and the diameter of the hole being drilled.
The NEC is mute on this matter, but you should inquire with your local building authority to be absolutely sure there are no other applicable requirements or “creative” interpretations of GFCI requirements.
To pass some new wires through my apartment, I need to drill holes through the walls with a diameter ranging from 10-20mm. For aesthetic purposes and to ensure proper cable bent radius, I prefer the holes to be located right at the corner of the ceiling.
Regrettably, the size of my drill limits my ability to approach the wall to a distance closer than approximately 7cm.
Are there any techniques or tips to drill a hole precisely at the corner of a ceiling?
To get the job done, a drill bit with flexibility is necessary.
Regarding the previous mention of the possibility of coming across nails,
The layout depicted here is a T wall configuration, which is characterized by two rooms that are next to each other and have a common
located at the ceiling.
Drilling a hole in the upper corner of the room will require drilling through the upper top plate. Depending on the thickness of the ceiling drywall and the diameter of the hole being drilled, it may also drill into a part of the lower top plate.
The diagram displays the usual spots for placing 16d spikes to secure the two top plate 2x4s. Each stud in the first top plate necessitates at least two nails on its top. The second top plate is secured at its extremities. In the center part of the diagram, there are two right-most spikes that pose a minimum risk of getting hit.
It is important to remember that when installing drywall, it is affixed with screws or nails on the edges and in the corners. Thus, it is possible for a drywall fastener to be present in the upper corner on either side, adding to the risk.
To increase the flexibility of drilling, we make use of bit extensions that can be easily found in 12″ length. In order to keep the bit straight, we use multiple extensions.