Drill a small hole through the floor photo 1 where you intend to place the outlet and locate the bit from the open ceiling below.
Cutting concrete floor electrical outlet.
Concrete floor box installationa step by step on how to install floor box systems accommodating data av and power connectivity where it s needed most we pr.
We used a cut off.
Lay in 3 4 pvc conduit and a couple carlon floor box see link.
If you drilled directly over a joist you won t be able to see the bit.
Junction boxes are about 4 inches square and usually mounted on the outside of the wall in concrete areas such as basements.
Move over a few inches and try again.
In this video we are cutting concrete with a circular saw aka skil saw.
Pour back concrete and finish off with a couple receptacles and brass covers.
Use heat vents cable or plumbing pipes that penetrate the floor and are visible from below as reference points.
Here is a link that might be useful.
Cutting the concrete step 1 locate the nearest junction box where you will be connecting the new electric outlet.
Locate the floor joists before you cut the outlet hole.
Just cut a trench with a concrete saw 6 wide 4 deep.