Expanding on the topic of GFCis: note that
GFCI products do not work correctly on dimmers!
Leviton used to make a
GFCI device specifically for line-voltage dimming, but that was sadly discontinued... probably 5-6 years ago now? Time is confusing. Last time I checked there were no
current products that
address the issue of providing
GFCI protection to dimmed circuits/fixtures. With the transition to less line-voltage dimming and more
LED & other
DMX controlled devices, I wouldn't hold my breath waiting for someone to come out with a new product for something that was never a big market even at its peak.
Also, it's not too uncommon to have
nuisance tripping with some fixtures--even when not dimming. It all depends on the
power supply design, and it often isn't something the manufacturer can tell you. Lower power-factors do increase the likelihood, so that can be one indicator in the (all too rare) cases where that information is available. There's also some variation in how sensitive a particular
GFCI device is--with the cheaper ones tending to be more susceptible to
nuisance tripping in general. Your best bet is to gather the equipment you're going to use and mock it up ahead of time so you can verify whether it will actually work the way you want. If you do have issues, sometimes splitting the load across more circuits (or, at least more
GFCI devices) can make it work better. The corollary to that is that a mockup isn't a mockup unless you're actually using the same number and type of fixtures you plan to use for the real thing.