C-H and SqD have list of "Known Equipment Conflicts" i.e. items that just plain ol' won't work no matter what you do. You can call and ask if an item is on thier list, and thier reply is "well sorry..."
Things I have found that wont work are Vaccum Cleaners, most like variable speed motor contols in say power tools and the like, some brands and makes of plasma and LCD screens (TV's and monitors), and yep some dimmers and other types of controls. I have torn my hair out looking for some of the "wiring defects" that could cause a trip, only to find that some breakers just wont work with some things. Now I just call before I go any further. As most of those things will trip right away...
IMO these things are still in thier infantcy, remember it took years for them to get a GFI that worked well with some things.
SqD actually told me that I had to get a newer lot number, and had to get it shipped from them because it had not made it into the supply system yet. Charged me for it too.
