While we are on the subject of bundling, check out my pictures in "Photos submitted."
It is a common practice out West to tightly bundle all the cables right above the main panel.
Anyway, I personally dont like this practice. I always use the 3M "stackers" or an equivalent in these situations.
electure- I do think derating should apply and I always frown on the use of ty-raps in a panel. It makes for a neater job but doesnt take into account heat buildup.
