Once you have the right drill and drill bit mark the spot on the concrete you want to drill through.
How to drill down to floors.
Also keep in mind that there is a gap of up to 16 inches between floors so you ll need to drill holes from both the top and bottom on each level.
They make extremely thin drill bits which are more like small stiff wires that you can use to drill down through the floor and find the location in the basement.
Every situation is unique.
Next turn on the drill s hammer function and start drilling applying firm but not forceful.
If you re on your own and can t hold the drill bit in one hand the wood pattern in the other and cool the drill bit at the same time then you can stop from time to time and spray some water on it.
Before sealing things back up make sure to spray in some fire break foam in the hole which will prevent the wall cavity from acting like a mini chimney.
Sometimes when running conduit or wires from floor to floor it is necessary to open up slightly larger holes maybe 4 x 6 near the floor and the ceiling to gain access for drilling the necessary holes and shoving the conduit wires through.
You would cut an opening in your wall the size of an outlet box.
Once the box holes are cut in the wall you will need to drill access holes in the wall plate at the bottom or top of the stud cavity.
Since you are drilling blind through a floor open space and then through a ceiling you have to take.
Use a small wet sponge to cool down the drill bit and prevent it from overheating.
Perhaps you could find a heating.
It appears mine has about a 3 4 hole just for the bare ground wire.
This allows you to run wires between floors without them being visible.
November 2019 edited november 2019.
To drill into concrete use a hammer drill with a carbide tipped masonry bit.
And using the metal handle that comes with the drill you bend the shaft inside the wall so you can drill down through the base plate.
I am drilling holes through walls and ceilings on a daily basis.
Drill holes in the wall plate.
These holes will be used to fish the cable down into the basement or crawlspace area or up into the attic in order to run the cable from box to box.
Measure over what ever distance you need to make sure you end up in the wall and then drill your normal hole.
Then gently probe downward by hand without spinning the bit until you re tap tap tapping on the inside of the basement ceiling repeat the cautious drilling.
There are numerous questions here that address the process for patching these access and inspection holes.
Gspdx try looking under the closet at the frame ground wire where it goes through the floor and where it comes out as that will give you an idea as to where you are.
You can also check your local wiring supply shop.