I'm re-wiring some outlets etc. in an old house I own. The basement has an open ceiling and the old wiring is stapled along the bottom surfaces of the joists to get to the service panel.
For the new wiring, it is okay to staple the new wires the same way along the bottom surfaces of the joists adjacent to the existing wires that are already stapled there, or does the new wiring need to go through the joists?
And, for stapling wires in general, is it okay to staple two runs of wire using one staple, or does each run of wire have to be stapled separately?
I am trying to find out what the National Electrical Code (or whatever the national code is for the U.S.) says for both of these situations, but I can't seem to find anything on the Internet.