I plan to update the wiring in the top floor of my 1940's era house in the future. I have the walls open in the floor below and can easily run the wire for that purpose. 1. Can I just secure the wire to a floor joist near the main panel without installing it inside the main panel?
2. If yes to question number one, do I have to terminate the other end of the wire in a switch or juction box or can I just note it's position and leave it in the ceiling?