I don't know of any bending radius requirements for an individual conductor. Every cable article (MC, NM, etc) does have a limit on the minimum radius since you wouldn't be able to observe any damage done to the enclosed conducxtors.
Few things are harder to put up with than the annoyance of a good example.
Thanks Redsy, After looking at it, I really don't think that's it. The old vertical support methods would fit, but the question was specifically about terminations. I'm going to have to look in Jim's old "Designing Electrical Systems" to see if there's a clue in there.
Thanks for your help guys, I'll let you know if I find anything concrete in case you run across it.