I have heard references to wire bundles in various threads. I'm not actually sure what they are. I am running a substantial number (12) of wires (mix of 12 and 14 guage) between 2 ceiling joist to a point where they branch out to service different things. Basically, I'm following the path of how the house was wired, but it's an old house and I have no idea if it was code or what the code was when it was wired. Bascially, its about a 10 foot run where a dozen wires run in this space. Joists are 16 inches on center. Does this run afoul of any code requirements?