It is MHO and that of many other inspectors I know, that running multiple cables through bored holes more than three consecutive 16" centers rafters, joists or studs constitute bundling. I know, they may flair out just a little between the bored holes, but they are still in close association to one another, and the heat may build-up between them. I am also aware that most cables are not loaded anywhere near to full load, and the likehood of the cables breaking down due to heat build-up is next to nothing. But, we inspectors have to enforce the code as written, not as we think it should be. Just as electricians have to install according to code, not as we think it should be.
Earl
