Electure--That's a good point about the panels. I think the same rule applies. If it's over 24" of bundling, it's no good. Usually bundling in a panel is because of stranded wire and the difficulty in getting it to stay in place. A good idea is to use as few ty-raps as is necessary, pick a few key spots to get the wires into the right shape, and leave the ty-raps loose.