Redsy,
They had some of that stuff out in the early 50's, all the way to mid to late 60's. Still old rolls around when I came in the trade.
Cover NM with a cover and call it 90 deg?
What about the conductors inside? I don't think Dave Shapiro recommended that, but since he'll probably read this today, ring in on it Dave.
Next question, since the mid 70's you could use 60 deg C at a ballast, what fixtures now require 90? Is this a residential thing? I am in unfamiliar territory there.
