I'm curious... has anyone ever tried to burn one? I find it hard to believe that those boxes would last 2 hours in a fire. I imagine the wall rating has more to do with the size of the hole being too small for significant flame penetration, kind of like how smoke rolls in the corners of rooms and won't set off fire alarms too close to the wall or ceiling.
I keep talking about it, but one of these days, I'm actually going to build a 2x4 wall with fiberglass insulation and boxes and all, and light that sucker up to see what happens. Might even plug #14 romex into a 60A outlet to test that, too
