Re: System Tech Toolkit Item Preferences
To get a little more detail on the matter, I emailed Richard Cadena, and asked if he'd mind sharing some insight into why he recommends Cat IV. He first suggested that the most important thing is to read UL1244 or, if you'd prefer something a little more easily digestable, this article: http://ecmweb.com/ops/electric_need_know_category/
He then says:
So, I'll keep using my Cat IV for gigs, and let y'all make your own choice.
(The question I do have that's awaiting an answer, because I'm unclear on the distinction, is the difference between a Cat III - 1000V and a Cat IV - 600V, since they have the same value of over-voltage protection.)