The Best How To Run Electrical Wire Through Studs Ideas. So it's best to step up to at least 5/8 for 12/2. Drill a hole on the other side using a flex bit drill.

If you still have access i would try and put the grommets in. So it's best to step up to at least 5/8 for 12/2. Cut out a square of plasterboard, notch teh joist for teh cable and move on to the next.